Shanghai Kou Qiang Yi Xue = Shanghai Journal Of Stomatology[JOURNAL]
Sun
200 papers
[Effect and prognosis of piezosurgery combined with 45°contra-angle turbine drill in extraction of impacted mandibular wisdom teeth].
Xie X, Yu X
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878504
PURPOSE: To investigate the clinical effect of piezosurgery combined with 45°contra-angle turbine drill in extraction of impacted mandibular wisdom teeth. METHODS: A total of 146 patients with impacted wisdom teeth at th...
PURPOSE: To investigate the clinical effect of piezosurgery combined with 45°contra-angle turbine drill in extraction of impacted mandibular wisdom teeth. METHODS: A total of 146 patients with impacted wisdom teeth at the median mandibular level admitted from June 2022 to June 2024 were randomly divided into control group and experimental group, with 73 cases in each group. The wisdom teeth in the control group were simply removed using 45° contra-angle turbine drill, while those in the experimental group were removed using piezosurgery combined with 45° contra-angle turbine drill. The treatment outcomes, postoperative pain, limited swelling and incidence of postoperative complications of the two groups were compared. RESULTS: There was no significant difference in operation time between the two groups(P＞0.05), and the amount of blood loss in the experimental group was significantly lower than that in the control group(P＜0.05). The visual analogue scale(VAS) of pain in the experimental group was significantly lower than that of the control group on the 1st and 3rd day after surgery(P＜0.05). Immediately, 1 day and 3 days after surgery, the serum C-reactive protein (CRP) in the experimental group was significantly lower than that in the control group (P＜0.05). The score of facial swelling degree and proportion in the experimental group were significantly lower than those in the control group (P＜0.05), the reduction rate of mouth opening degree and the proportion of mouth opening restriction in the experimental group were significantly lower than those in the control group(P＜0.05). There were no significant differences in the total incidence of postoperative complications such as tongue numbness, lower lip numbness, adjacent tooth injury, dry socket and root fracture between the two groups(P＞0.05). CONCLUSIONS: Compared with only using 45° contra-angle turbine drill, the combination of piezosurgery for impacted mandibular wisdom teeth extraction can help reduce intraoperative bleeding, alleviate pain and swelling,improve the degree of limited mouth opening.
[A new fixed Twin-block appliance in the treatment of adolescent patients with skeletal Class Ⅱ malocclusion].
Ding M, Zhang W, Shen Q … +5 more , Chen Y, Zhang H, Ge F, Hang M, Wu J
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878503
PURPOSE: To evaluate the clinical effect of a new fixed Twin-block on adolescent patients with skeletal ClassⅡ malocclusion. METHODS: Twenty-one patients aged 10-13 years with skeletal ClassⅡ malocclusion with mandibular...
PURPOSE: To evaluate the clinical effect of a new fixed Twin-block on adolescent patients with skeletal ClassⅡ malocclusion. METHODS: Twenty-one patients aged 10-13 years with skeletal ClassⅡ malocclusion with mandibular retrusion were chosen for functional treatment using a new fixed Twin-block. Before and after treatment, panoramic and cephalometric films were taken, and the observation indexes were measured and recorded. RESULTS: There was no loosening or destruction of the appliance during treatment, the mean duration of treatment was (11.42±1.78) months. The position of the mandible(SNB), the length of the mandible (Co-Gn), nasolabial angle (Cm-Sn-UL), condylar sagittal position(Pcd-S), the lower labial protrusion distances (LL-SnPg') were significantly increased (P＜0.05) after treatment, and the relative position of the maxilla and mandible (ANB), Y-axis angle(SGn/FH), the inclination of the maxillary incisors (U1/SN), and the depth of the mental-labial sulcus (Si-LLPg') reduced(P＜0.05). Maxillary position(SNA), posterior mandibular position(S Vert-Co), mandibular length(Go'-Me), the mandibular incisor inclination (IMPA), and upper and lower mesial incisor angles(U1/L1), protrusion of the upper lip (UL-SnPg') were changed but without significant difference(P＞0.05). The vertically orientated measurements of the vertical position of the lower dentition(Ll-MP), L6-MP, the vertical distance of the upper and posterior teeth (U6-PP), anterior height (N-Me), facial height index(S-Go'/N-Me), and mandibular plane angle (MP/SN) did not change significantly(P＞0.05), while the posterior height(S-Go'), the vertical position of the upper dentition(U1-PP), occlusal plane angle (SN/OP), mandible height (Ar-Go'), the mandible ramus height(Co-Go) was increased significantly (P＜0.05). CONCLUSIONS: New fixed Twin-block significantly promotes mandibular growth and provides effective vertical control, improves the facial profile by retracting the maxillary incisors, and the clinical effect is reliable.
[Application of 3D oral scanning combined with digital guide plate in implant restoration of mandibular posterior dentition defect].
Ye S, Zhu J, Deng N
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878502
PURPOSE: To investigate the value of 3D oral scanning combined with digital guide plate in implant restoration of mandibular posterior dentition defect. METHODS: A total of 96 patients with mandibular posterior dentition...
PURPOSE: To investigate the value of 3D oral scanning combined with digital guide plate in implant restoration of mandibular posterior dentition defect. METHODS: A total of 96 patients with mandibular posterior dentition defects treated in Hangzhou Stomatology Hospital from March 2021 to October 2022 were randomly divided into control group (48 cases) and experimental group (48 cases). The control group was treated with conventional implant repair, while the experimental group was treated with 3D oral scanning combined with digital guide plate implant repair. The operation related indexes, implant accuracy, implant stability, alveolar ridge and parietal bone absorption of the two groups were compared, and the implant success rates, complication rates and patient satisfaction were also evaluated. RESULTS: There was no significant difference in postoperative pain time and swelling time between the two groups(P＞0.05), but the surgical time in the experimental group was significantly shorter than that in the control group(P＜0.05). The crown deviation, root deviation, depth deviation and angle deviation in the experimental group were significantly smaller than those in the control group(P＜0.05). The success rate of the experimental group was significantly higher than that of the control group(P＜0.05). There was no statistically significant difference in the planting success rate and stability coefficient between the two groups(P＞0.05), and the absorption of alveolar crest bone in the experimental group was significantly lower than that in the control group(P＜0.05). The total incidence of complications in the experimental group was significantly lower than that in the control group (P＜0.05). The satisfaction of patients in the experimental group was significantly higher than that in the control group(P＜0.05). CONCLUSIONS: The application of 3D oral scanning combined with digital guide plate in implant restoration of mandibular posterior dentition defect can effectively shorten the operation time, improve the accuracy of implant, reduce the complications, and improve patients' satisfaction.
[Prediction value of miR-146a-5p, PI3K and Akt in gingival crevicular fluid on the severity of chronic periodontitis].
Gao J, Zhang N, Yue J
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878501
PURPOSE: To investigate the predictive value of microRNA-146a-5p (miR-146a-5p), phosphatidylinositol 3 kinase (PI3K) and protein kinase B (Akt) in gingival crevicular fluid for the severity of chronic periodontitis (CP)....
PURPOSE: To investigate the predictive value of microRNA-146a-5p (miR-146a-5p), phosphatidylinositol 3 kinase (PI3K) and protein kinase B (Akt) in gingival crevicular fluid for the severity of chronic periodontitis (CP). METHODS: A total of 121 CP patients admitted to Qinhuangdao Hospital of Peking University Third Hospital from March 2021 to March 2024 were selected. According to the severity of the disease, the patients were divided into mild-to-moderate group(n=85) and severe group(n=36). The levels of miR-146a-5p, PI3K and Akt in gingival crevicular fluid were detected, and probing depth(PD), clinical attachment loss(CAL), sulcus bleeding index(SBI) were collected to analyze the factors affecting the severity of CP. Area under the curve (AUC) of receiver operating characteristic (ROC) was used to analyze the predictive value of miR-146a-5p, PI3K and Akt in CP severity. RESULTS: The miR-146a-5p, PI3K, Akt, probing depth(PD), the level of clinical attachment loss (CAL), the ratio of combined diabetes and the smoking history in the severe group were significantly higher than those in the mild-moderate group(P＜0.05). Logistic regression analysis showed that diabetes mellitus(OR=3.252, 95%CI: 1.312-8.059), miR-146a-5p level(OR=5.273, 95%CI: 2.469-11.258), PI3K level (OR=4.877, 95%CI: 1.812-13.123) and Akt level (OR=4.421, 95%CI: 1.669-11.710) were independent risk factors affecting the severity of the disease(P＜0.05). ROC results showed that the AUC of miR-146a-5p, PI3K, Akt and their combined prediction of CP severity were 0.801, 0.789, 0.772 and 0.898, respectively(P＜0.05). CONCLUSIONS: The levels of miR-146a-5p, PI3K and Akt in gingival crevicular fluid are independent risk factors for CP severity, and combined detection of the three parameters can better predict the severity of patients' disease.
[Evaluation of the effect of concentrated growth factor membrane and Haiao oral repair membrane on the preservation of tooth extraction site in the posterior tooth region].
Hu S, Wu C, Wang Q … +2 more , Yin M, Lin H
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878500
PURPOSE: To evaluate the effect of concentrated growth factor (CGF) membrane and Haiao oral repair membrane on the preservation of extraction sites in the posterior area of teeth. METHODS: A total of 96 patients requirin...
PURPOSE: To evaluate the effect of concentrated growth factor (CGF) membrane and Haiao oral repair membrane on the preservation of extraction sites in the posterior area of teeth. METHODS: A total of 96 patients requiring site preservation after posterior tooth extraction from January 2020 to December 2022 were selected and divided into groups A and B by random number table method, with 48 cases in each group. After tooth extraction, Bio-Oss bone powder was used to cover tooth extraction wound in group A with CGF membrane, and in group B with Haiao oral repair membrane. The healing of the operative area, the changes of vertical height and horizontal width of alveolar bone, visual analog scoring (VAS) of pain, the changes of buccal and palatal tissue thickness and the rate of bone replantation were compared between the two groups. RESULTS: One week after operation, the tooth extraction wound in group A healed well, while 2 cases in group B healed poorly, but there was no significant difference between the two groups(P＞0.05). Before surgery, there was no significant difference in vertical height and horizontal width of alveolar bone between the two groups(P＞0.05); at 6 months after operation, the vertical height of alveolar bone was significantly increased and the horizontal width was significantly decreased(P＜0.05), but there was no significant difference between the two groups(P＞0.05).The VAS score of pain 1 week after surgery in 2 groups was lower than that 3 days and 24 hours after surgery, and the VAS score of pain in group A was lower, and the interaction between groups, and time points were significantly different(P＜0.05).There was no significant difference in the thickness of buccal and palatal tissues between the two groups before and 6 months after surgery(P＞0.05); at 6 months after surgery, the tissue thickness of the palatal side in group B was significantly lower than before surgery(P＜0.05). Six months after surgery, the bone replantation rates in group A and group B were 4.17% and 6.25%, respectively, with no significant difference between the two groups(P＞0.05). CONCLUSIONS: Both CGF membrane and Haiao oral repair membrane have good efficacy in the preservation of tooth extraction sites in the posterior region, which can effectively delay alveolar bone mass absorption, and CGF has a better effect in reducing short-term postoperative pain in patients.
[Evaluation of the effect of cruciform tooth division and T-type crown amputation in extraction of mandibular middle and low impacted teeth].
Liu J, Wang Y, Liu Z
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878499
PURPOSE: To evaluation the effect of cruciform tooth division and T-type crown amputation in extraction of mandibular middle and low impacted teeth. METHODS: A total of 81 patients with mandibular middle and low impacted...
PURPOSE: To evaluation the effect of cruciform tooth division and T-type crown amputation in extraction of mandibular middle and low impacted teeth. METHODS: A total of 81 patients with mandibular middle and low impacted teeth treated in Bozhou People's Hospital from September to November 2024 were selected. According to the different extraction methods,they were divided into the control group(n=40, T-type crown amputation) and experimental group(n=41, cross tooth extraction). The operative time, intraoperative complications(anxiety, broken root), postoperative complications (pain, swelling and restricted mouth opening), healing of tooth extraction socket 1 week after surgery, and quality of life before and 1 week after surgery[oral health impact scale 14(OHIP-14)] were compared between the two groups. RESULTS: The operative time of the experimental group was significantly shorter than that of the control group, the total incidence of intraoperative complications(4.88%) was significantly lower than that of the control group (20.00%), the score of postoperative pain and mouth opening restriction was significantly lower than that of the control group, the degree of postoperative swelling was significantly less than that of the control group, and the total incidence of postoperative complications(4.88%) was significantly lower than that of the control group(32.43%). The healing score of tooth socket 1 week after operation was significantly lower than that of the control group (P＜0.05). One week after surgery,the OHIP-14 score of both groups was decreased,and the experimental group was significantly lower than the control group(P＜0.05). CONCLUSIONS: Compared with T-type crown amputation, cruciform tooth division can shorten the operation time of mandibular middle and low impacted tooth extraction, reduce the occurrence of intraoperative anxiety, broken root, postoperative pain, swelling and restricted mouth opening, and is conducive to the healing of tooth extraction wound.
[Clinical anatomy of the islanded pedicled nasolabial flap and its application in reconstruction of postoperative defects of T1-T2 stage carcinoma of the floor of mouth].
Zhou X, Jin R
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878498
PURPOSE: To investigate the anatomic features of nasolabial flap pedicled with a facial artery and its application in repairing the defect after surgery of stage T1-T2 carcinoma of the floor of mouth. METHODS: Dissection...
PURPOSE: To investigate the anatomic features of nasolabial flap pedicled with a facial artery and its application in repairing the defect after surgery of stage T1-T2 carcinoma of the floor of mouth. METHODS: Dissections of the maxillofacial region were performed on 8 specimens of national adults fixed with 10% formaldehyde, and the anatomical pictures were analyzed using Image-Pro Plus 6.0 software. Nine patients were retrospectively reviewed from August 2015 to January 2024 for the repair of postoperative defects of stage T1-T2 carcinoma of the floor of mouth using nasolabial fold flaps with a facial artery perforator branch as vascular pedicle. RESULTS: The external diameter of the facial artery at the lower border of the mandible was (2.05±0.98) mm. The main trunk of the facial artery traveled along the line from the beginning of the facial artery to the nasal blade and had a length of (90.89±3.79) mm. The main facial vein run along the line from the beginning of the facial artery to the medial canthus, and its length is (118.10±2.57) mm. The longest distance between the facial artery and the facial vein was (25.92±1.96) mm. Nine patients had a favourable postoperative outcomes without obvious complications. CONCLUSIONS: Repair of postoperative defects in middle-aged and elderly patients with T1-T2 stage carcinoma of the floor of mouth using a nasolabial fold flap can achieve satisfactory clinical outcomes.
[Evaluation of the effect of simultaneous implantation of alveolar process dilation and guided bone regeneration in patients with severe deficiency of alveolar bone horizontal width].
Yu M, Jin R
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878497
PURPOSE: To explore the influence of alveolar process expansion, guided bone regeneration (GBR) and bone grafting for simultaneous dental implantation therapy on bone resorption volume, retention and masticatory function...
PURPOSE: To explore the influence of alveolar process expansion, guided bone regeneration (GBR) and bone grafting for simultaneous dental implantation therapy on bone resorption volume, retention and masticatory function in patients with severe deficiency of alveolar bone horizontal width. METHODS: Eighty patients with severely insufficient alveolar bone width who received dental implantation therapy in Hangzhou Stomatology Hospital were selected from January 2021 to January 2023. Totally 40 patients (55 teeth) who received alveolar process expansion combined with GBR bone grafting were included in the experimental group, while 40 patients (51 teeth) with traditional alveolar bone splitting were enrolled as the control group. Both groups were treated with dental implantation at the same time. The repair effect [bone healing time, diameter and implant stability quotient (ISQ)], occurrence of complications and subjective feeling scores (retention, pain and tooth aesthetics) 1 year after surgery, alveolar bone resorption volume (mesial and distal), periodontal related indicators [gingival sulcus depth (SPD), gingival sulcus bleeding index (SBI) and gingival index(GI)] and masticatory function (masticatory efficiency, occlusal force) before surgery and 1 year after surgery were compared between both groups. RESULTS: The bone healing time in the experimental group was significantly less than that in the control group(P＜0.05). The total incidence rate of complications was significantly lower in the experimental group than that in the control group(P＜0.05). At 1 year after surgery, the alveolar bone resorption volume, SPD, SBI and GI in both groups were significantly reduced than those before surgery, and the indicators in the experimental group were much lower(P＜0.05). The masticatory efficiency and occlusal force in the experimental group were significantly enhanced compared to before surgery(P＜0.05), and the two indicators were significantly higher than those in the control group(P＜0.05). At 1 year after surgery, the retention function and pink esthetic score(PES) in the experimental group were significantly higher (P＜0.05) while the visual analogue scale(VAS) score was significantly lower than the control group (P＜0.05). CONCLUSIONS: Simultaneous dental implantation with alveolar process expansion combined with GBR bone grafting has good repair effect and safety for patients with severe bone width deficiency. It can help to reduce bone resorption volume, enhance retention stability after bone grafting, relieve pain and improve tooth aesthetics.
[Three dimensional finite element analysis of different restoration types and materials for maxillary first premolar with large defect].
Li X, Tian B, Mirealimu M … +1 more , Gao Y
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878496
PURPOSE: To provide references for the selection of restoration types and materials for the first premolar with large defect in clinical practice. METHODS: A large area defect model of the maxillary first premolar was es...
PURPOSE: To provide references for the selection of restoration types and materials for the first premolar with large defect in clinical practice. METHODS: A large area defect model of the maxillary first premolar was established and repaired with different types and materials, including group A (inlay group), group B (endocrown group), group C (fiber post core crown group), and group D (pure titanium post core crown group). And then, according to different repair materials, it was divided into 3 subgroups, namely group 1 (zirconia), group 2 (glass ceramic), and group 3 (resin based ceramic), totaling 12 groups. The stress distribution and magnitude were investigated using finite element analysis software. RESULTS: In the inlay group, the stress concentration area was large and tended to spread along the neck of tooth; in the post core crown group and endocrown group, the stress distribution was more uniform. In terms of restorative materials for endocrown, resin based ceramic materials had the lowest stress, followed by glass ceramic materials, and zirconia materials had the highest stress. CONCLUSIONS: Large defects of the first premolar can be repaired with endocrowns and post core crowns, and endocrowns have good applicability and advantages. Resin based ceramic materials are recommended for the selection of the endocrown materials for the least stress of the remaining tooth.
[Maxillary sinus floor wall typing and three-dimensional finite element modelling of maxillary sinus internal elevation].
Zhu K, Cheng L, Zheng Y … +1 more , Sun Q
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878495
PURPOSE: To evaluate the equivalent stress and displacement of maxillary sinus floor mucosa by three-dimensional finite element analysis under different types of maxillary sinus floor. METHODS: Three-dimensional finite e...
PURPOSE: To evaluate the equivalent stress and displacement of maxillary sinus floor mucosa by three-dimensional finite element analysis under different types of maxillary sinus floor. METHODS: Three-dimensional finite element models of three different maxillary sinus floor shapes (shallow concave, deep concave and convex) were established by three-dimensional reconstruction of maxillary sinus bones and mucosa. The process of applying dynamic impact load to the maxillary sinus floor was simulated by using the ejector during maxillary sinus lifting operation, and the biomechanical characteristics of different maxillary sinus floor mucosa during ejection was analyzed. RESULTS: The equivalent stress and displacement of maxillary sinus floor mucosa were deep concave (0.518 90 MPa/0.002 955 mm), shallow concave (0.590 25 MPa/0.003 515 mm) and convex (0.623 56 MPa/0.003 660 mm). In the process of axial displacement of the ejector from 1-10 mm, the stress of the mucosa at the bottom of maxillary sinus increased uniformly. CONCLUSIONS: The equivalent stress level of mucosa is related to the morphology of sinus floor. Under the same load condition, the tension on mucosa increases obviously during internal lifting of convex maxillary sinus floor, which has an adverse effect during internal lifting operation.
[Role of minocycline-loaded silica nanospheres in the regulation of periodontitis inflammation in rats].
Yang J, Ding K, Sun Z … +2 more , Cui Y, Liu Z
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878494
PURPOSE: To investigate the effect of minocycline hydrochloride(MH) loaded nano-silica microspheres(MSNion) on the inflammatory regulation of periodontitis in rats. METHODS: Mesoporous silica(MSN) was prepared by classic...
PURPOSE: To investigate the effect of minocycline hydrochloride(MH) loaded nano-silica microspheres(MSNion) on the inflammatory regulation of periodontitis in rats. METHODS: Mesoporous silica(MSN) was prepared by classical St?ber method and MSNion was obtained by doping hydroxyapatite. MH was loaded into MSNion by magnetic stirring, and chitosan (COS), which had anti-inflammatory and antibacterial effect, was adsorbed on its surface by using charge interactions, forming MH@MSNion@COS microspheres. The microspheres were characterized by electron microscopy and X-ray diffraction. The experiments were divided into control, MH, MSNion@COS and MH@MSNion@COS groups. The cytotoxicity of each group was assessed using the CCK-8 cell assay and the optimal concentration was determined. The expression levels of inflammatory factors(TNF-α, IL-6, IL-1β, iNOS, IL-10) were determined in each group using ELISA kits. In periodontitis model, the rats were treated according to the grouping of cell experiments, periodontal probing depth (PD) and gingival index (GI) of the rats were measured at 0, 1, 2, 4 weeks. At 4 weeks of the experiment, the peripheral blood of each group of rats was collected, and the levels of inflammatory factors in serum were detected by ELISA kits. RESULTS: Nanoparticles with a particle size of about 110 nm were prepared and observed as regular spheres by electron microscopy. MH@MSNion@COS degraded into fragments with unclear structure at the 8th day. In vitro drug release assay showed a slow release of MH, and the MH release rate reached 80% at about the 15th day. In cell experiment, MH@MSNion@COS showed the best cell proliferation activity at 50 μg/mL (P＜0.05), and the cell activity was higher than that of MH group and MSNion@COS group(P＜0.05). There was no significant difference between MH group and MSNion@COS group. ELISA results showed that the expression of inflammatory factors in MH@MSNion@COS group was significantly lower than that in LPS group at the first day(P＜0.01), and there was no significant difference between MH group and MSNion@COS group. At the 3rd day, the expression of M1 inflammatory factors in MH@MSNion@COS group was lower than that in control group, and the expression of M2 inflammatory factors was higher than that in control group(P＜0.05). PD and GI of MH@MSNion@COS group were significantly decreased after administration compared with other groups(P＜0.05), and the amount of inflammatory factors was lower than other groups(P＜0.05). CONCLUSIONS: MH@MSNion@COS has a good inflammatory regulation effect on experimental periodontitis in vitro and in vivo.
[Three-dimensional finite element analysis of stress distribution and influence of stainless steel preformed crown on temporomandibular joint in children].
Zhang Y, Liu J
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878493
PURPOSE: To study the stress effect and distribution pattern of the first and second primary molars on temporomandibular joint in the restoration of upper and lower teeth with stainless steel precrown using three-dimensi...
PURPOSE: To study the stress effect and distribution pattern of the first and second primary molars on temporomandibular joint in the restoration of upper and lower teeth with stainless steel precrown using three-dimensional finite element method, in order to provide theoretical basis for clinical diagnosis and treatment. METHODS: CBCT data from one male and one female aged 3, 6, and 8 years old were collected, and the first and second maxillary molar teeth, upper and lower mandible, dentition and temporomandibular joint(TMJ) data were obtained respectively. Three-dimensional finite element method was used to create the finite element models of the first and second maxillary molar teeth, upper and lower mandible, dentition and TMJ, respectively. The stress distribution of the TMJ with the stainless steel prefabricated crown raised at different heights was analyzed by applying the load force. RESULT: After stainless steel crown repair, different loads were applied to the TMJ, and the maximum stress values generated by the condyle were analyzed and compared. The stress difference analysis results of the condyle in children aged 3, 6, and 8 under different genders, ages, and load angles were statistically significant(P＜0.01), while the stress difference analysis results of different groups were not statistically significant(P＞0.05). CONCLUSIONS: After restoring primary molars with stainless steel preformed crowns, applying three angle loads results in a more uniform distribution of stress in the TMJ at normal occlusal height. Therefore, using stainless steel crowns to restore normal occlusal height in clinical restorative treatment is beneficial for reducing stress concentration in TMJ and improving the efficacy and long-term prognosis of primary molars restoration.
[Effect of Er:YAG laser combined with NaClO on the removal of root canal smear layer and dentin microhardness].
Bai X, Wang X
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878492
PURPOSE: To evaluate the effects of Er:YAG laser combined with NaClO on the removal of root canal taint layer, calcium hydroxide clearance and dentin microhardness. METHODS: A total of 318 single-rooted extracted teeth c...
PURPOSE: To evaluate the effects of Er:YAG laser combined with NaClO on the removal of root canal taint layer, calcium hydroxide clearance and dentin microhardness. METHODS: A total of 318 single-rooted extracted teeth collected from March 2021 to January 2024 were selected, the 13 mm root was taken and mechanically prepared and randomly divided into three groups, with 106 teeth in each group. The control group was rinsed with NaClO, the experimental group 1 was rinsed with NaClO combined with ultrasonic washing, and the experimental group 2 was treated with Er:YAG laser on the basis of NaClO. The removal of the smear layer was observed under electron microscope, and the microhardness of dentin post-treatment was assessed using a microhardness tester. RESULTS: The clearance rate of calcium hydroxide in experimental group 2 was significantly higher than that in experimental group 1 and control group, and the stain layer scores of crown formula 1/3, root middle 1/3 and root tip 1/3 were significantly lower than those in the other 2 groups(P＜0.05). There was no significant difference between the initial and final microhardness of the three groups(P＞0.05). CONCLUSIONS: Er: YAG laser combined with NaClO can effectively enhance the removal effect of stain layer in root canal therapy, and has little effect on dentin microhardness.
[Study on the therapeutic effect and potential mechanisms of astaxanthin electrospun patches on oral mucosal ulcers in rats].
Wang H, Sun P, Liu Z … +5 more , Zhang H, Guo Y, Zhao H, Wang P, Deng J
Shanghai Kou Qiang Yi Xue · 2025 Jun · PMID 40878491
PURPOSE: To investigate the effect and underlying mechanism of astaxanthin electrospun patches in treating oral ulcers in rats. METHODS: An oral ulcer model of rats was established by mechanical trauma, then the rats wer...
PURPOSE: To investigate the effect and underlying mechanism of astaxanthin electrospun patches in treating oral ulcers in rats. METHODS: An oral ulcer model of rats was established by mechanical trauma, then the rats were randomly divided into astaxanthin electrospun patch group, chitosan patch group, metronidazole patch group and blank control group. The ulcer healing time and the area healing rate of each group were observed. The pathological changes of ulcer tissues in each group were observed and scored by H-E staining 2, 4 and 6 days after drug administration. Meanwhile, the toxic effects of the drugs on the rat organs were detected. The changes in the levels of superoxide dismutase (SOD) and malondialdehyde (MDA) in ulcer tissues were detected by WST-1 and TBA methods. Tumor necrosis factor-α (TNF-α) and Interleukin 6 (IL-6) were analyzed through immunohistochemistry experiments. RESULTS: Compared with the other groups, the astaxanthin electrospun patch could significantly accelerate the reduction of the ulcer area, promote its pathological healing, reduce the expression levels of TNF-α and IL-6, and significantly decrease the content of MDA in the ulcer tissue while increasing the activity of SOD. Six days after administration, there were significant differences in the levels of SOD and MDA compared with the blank control group and the metronidazole patch group(P＜0.05), while there was no significant difference compared with the chitosan patch group(P＞0.05). CONCLUSIONS: The astaxanthin electrospun patches have better performance in promoting ulcer healing, which may be related to their strong antioxidant and anti-inflammatory properties. It is expected to provide a natural marine preparation with better efficacy for the treatment of oral ulcers.
[Application of pedicled buccal fat pad/mucoperiosteal composite flap technique to prevent and seal oroantral fistula].
Zou J, Hou X, Wang L … +4 more , Li L, Li Y, Hu X, Xing X
Shanghai Kou Qiang Yi Xue · 2025 Apr · PMID 40550778
PURPOSE: To summarize and evaluate the clinical effectiveness of the pedicled buccal fat pad combined with a mucoperiosteal composite flap in preventing and closing oroantral fistula. METHODS: This study included a total...
PURPOSE: To summarize and evaluate the clinical effectiveness of the pedicled buccal fat pad combined with a mucoperiosteal composite flap in preventing and closing oroantral fistula. METHODS: This study included a total of 12 patients who underwent closure of surgical incisions following treatment of posterior maxillary lesions using a pedicled buccal fat pad combined with a mucoperiosteal composite flap. In all cases, the pedicled buccal fat pad was placed beneath the local mucoperiosteum to form a composite flap for incision closure. The retrospective analysis encompassed patients' baseline data, including age, gender, diagnosis, clinical symptoms, imaging characteristics, surgical procedures, and treatment outcomes. Additionally, the analysis included an evaluation of the local functional outcomes in the operative area. RESULTS: Among the 12 patients, there was an equal distribution of males and females (1∶1 ratio), with an average age of (35.83±20.17) years. Among them, 8 cases had cystic lesions in the maxillary posterior region, 3 cases had oroantral fistula, and 1 case had maxillary comminuted fracture. All patients (100%) underwent surgery involving the maxillary posterior dental region adjacent to the maxillary sinus. Preoperative symptoms included swelling, pain, halitosis, and occlusal disorder. CT imaging revealed that bone destruction in the posterior maxilla frequently affected multiple teeth, often with impacted teeth, and showed a close association with the maxillary sinus. Buccal bone resorption or destruction was the predominant feature in the operative area, and after removal of the diseased teeth, limited buccal bone remained. Wound closure was achieved using a buccal fat pad/mucoperiosteal composite flap technique. During the follow-up period, all 12 patients healed successfully, with no occurrences of oral-nasal fistula. Additionally, no significant changes in buccal morphology or vestibular groove were observed. CONCLUSIONS: The use of a pedicled buccal fat pad combined with a mucoperiosteal composite flap is effective in sealing and preventing oroantral fistula, improving clinical symptoms in cases involving oroantral fistula and maxillary posterior bone resorption during surgery.
[Comparison of biomechanical effects and tissue reparability of photodynamic and laser in the adjuvant treatment of peri-implantitis].
Zhang X, Yang H
Shanghai Kou Qiang Yi Xue · 2025 Apr · PMID 40550777
PURPOSE: To compare the biomechanical effects and tissue reparability of photodynamic and laser in the adjuvant treatment of peri-implantitis. METHODS: A total of 112 patients with peri-implantitis who were diagnosed and...
PURPOSE: To compare the biomechanical effects and tissue reparability of photodynamic and laser in the adjuvant treatment of peri-implantitis. METHODS: A total of 112 patients with peri-implantitis who were diagnosed and treated from March 2023 to April 2024 were randomly divided into the control group and the experimental group, with 56 cases in each group. On the basis of conventional symptomatic treatment, the control group received photodynamic therapy and the experimental group received laser therapy. The biomechanical effects [implant mobility(IM), peri-implant bone density(PBD), mesial and distal marginal bone resorption of the implant], tissue reparability[sulcus bleeding index (SBI), plaque index (PLI) and probing depth (PD)], inflammatory factors [interleukin-6 (IL-6), tumor necrosis factor (TNF-α), and matrix metalloproteinases-8(MMP-8)] and the proportion of Porphyromonas gingivalis(P.g) in the total bacterial count were compared before and 1, 2, and 3 months after treatment between the two groups. SPSS 26.0 software package was used for statistical analysis of the data. RESULTS: After 1-3 months of treatment, both groups showed significant decrease in IM, mesial and distal marginal bone resorption of the implant, SBI, PLI, PD, IL-6, TNF-α, MMP8, and the proportion of P.g to total bacteria (P＜0.05), and significant increase in PBD (P＜0.05). Compared with the control group, the experimental group showed significant improvements in IM, PBD, mesial and distal marginal bone resorption of the implant, IL-6, TNF-α and MMP8 (P＜0.05). Compared with the experimental group, the control group showed significant improvements in SBI, PLI, PD and the proportion of P.g to total bacteria (P＜0.05). CONCLUSIONS: Both photodynamic and laser therapy can be used in the adjuvant treatment of peri-implantitis. Photodynamic therapy has advantages in tissue repair and reducing the proportion of P.g to total bacteria, while laser therapy has advantages in biomechanical effects and reducing inflammatory factors.
[Evaluation of the effect of Lava Ultimate veneer combined with cast porcelain inlays in the treatment of mild-moderate dentition wear in the elderly patients].
Zhou J, Wang J, Pang S … +5 more , Zhang Y, Ma H, Feng Y, Zhao S, Hu K
Shanghai Kou Qiang Yi Xue · 2025 Apr · PMID 40550776
PURPOSE: To explore the effect of Lava Ultimate veneer combined with cast porcelain inlays in the treatment of mild-moderate dentition wear in the elderly. METHODS: A total of 60 elderly patients with mild-moderate denti...
PURPOSE: To explore the effect of Lava Ultimate veneer combined with cast porcelain inlays in the treatment of mild-moderate dentition wear in the elderly. METHODS: A total of 60 elderly patients with mild-moderate dentition wear due to physical factors who underwent treatment from July 2019 to July 2023 were selected and randomly divided into control group(n=30) and experimental group(n=30). The control group received traditional all-ceramic crown restoration treatment, while the experimental group received Lava Ultimate veneers for anterior teeth and porcelain inlays for posterior teeth. The chewing efficiency, prosthesis effectiveness, periodontal index [gingival index(GI), plaque index (PI)], clinical efficacy, aesthetic satisfaction and comfort were compared between the two groups before and after treatment.SPSS 19.0 software package was used for statistical analysis of the data. RESULTS: Before treatment, there was no significant difference in chewing efficiency and absorbance between the two groups(P＞0.05). After treatment, masticatory efficiency and absorbance of the experimental group were significantly higher than those of the control group(P＜0.05). One week and 6 months after treatment, there was no significant difference in prosthesis margin fit, wear degree, retention, gingival condition, color, shape, secondary caries, restoration fracture, GI and PI between the two groups(P＞0.05). At 12 months after treatment,the prosthesis margin fit, retention, gingival condition, GI and PI of the experimental group were significantly better than those of the control group(P＜0.05). The total effective rate, satisfaction and comfort of the experimental group were significantly higher than those of the control group(P＜0.05). CONCLUSIONS: After treatment with Lava Ultimate veneers for anterior teeth and porcelain inlays for posterior teeth, the masticatory efficiency of the elderly patients with mild-moderate dentition wear is improved, and the prosthesis effect, periodontal index, satisfaction and comfort are significantly improved.
[Effect of nonsurgical periodontal therapy on glycemic control in type 2 diabetes patients with chronic periodontitis].
Shang Y, Jiang Y, Chen Y … +2 more , Fu H, Li F
Shanghai Kou Qiang Yi Xue · 2025 Apr · PMID 40550775
PURPOSE: To investigate the effect of nonsurgical periodontal therapy on blood glucose control in patients with type 2 diabetes mellitus (T2DM) and chronic periodontitis, as well as the sensitive population. METHODS: A t...
PURPOSE: To investigate the effect of nonsurgical periodontal therapy on blood glucose control in patients with type 2 diabetes mellitus (T2DM) and chronic periodontitis, as well as the sensitive population. METHODS: A total of 120 patients with T2DM and chronic periodontitis who were admitted to the Department of Endocrinology at Lishui City People's Hospital from March 2022 to March 2023 were randomly divided into experimental group and control group, with 60 patients in each group. All patients received oral health education, and their general information, community periodontal index (CPI), attachment loss (AL), fasting plasma glucose (FPG), and haemoglobin A1c (HbA1c) were collected. The experimental group received periodontal scaling and root planing. Three months later, CPI, AL, FPG, and HbA1c were measured. Stata 15.0 software was used for statistical analysis. RESULTS: After periodontal scaling and root planing, the CPI, FPG, and HbA1c in the experimental group were significantly lower than those before treatment(P＜0.01) and those in the control group(P＜0.05). AL in the experimental group was also significantly lower than before treatment(P＜0.05) and the control group (P＜0.05). The change of FPG after treatment was positively correlated with the duration of diabetes (P＜0.01) and the baseline CPI(P＜0.05), but negatively correlated with whether suffering from hypertension(P＜0.05). It was also negatively correlated with the FPG level before treatment (P＜0.01). The change of HbA1c after treatment was positively correlated with the duration of diabetes(P＜0.05) and negatively correlated with the HbA1c level before treatment(P＜0.01). CONCLUSIONS: Nonsurgical periodontal therapy is helpful to blood sugar control of type 2 diabetes patients with periodontitis. Patients with higher baseline CPI levels and longer disease durations show greater improvement in glycemic control after treatment.
[The influence of the relationship between the root apex of the posterior teeth and the maxillary sinus floor on the thickness of the maxillary sinus mucosa].
Wu J, Gao Y, Chen L
Shanghai Kou Qiang Yi Xue · 2025 Apr · PMID 40550774
PURPOSE: To measure and analyze the thickness of the maxillary sinus mucosa under different relationships between the maxillary posterior teeth apex and the maxillary sinus floor on cone beam CT (CBCT). METHODS: A total...
PURPOSE: To measure and analyze the thickness of the maxillary sinus mucosa under different relationships between the maxillary posterior teeth apex and the maxillary sinus floor on cone beam CT (CBCT). METHODS: A total of 987 patients requiring implant surgery due to dentition defect or loss were selected from Ruijin Hospital, Shanghai Jiao Tong University School of Medicine from January 2020 to December 2022. The maxillary posterior teeth most closely related to the maxillary sinus were observed on CBCT, the tooth position and root apex were recorded, and the vertical distance between the apex of the posterior tooth and the base of the maxillary sinus was measured. According to the distance between the root apex and the maxillary sinus floor, the posterior teeth were divided into three categories: Class Ⅰ: the distance between the root apex and the maxillary sinus floor (d ＞0 mm); Class Ⅱ : the root apex was attached to the maxillary sinus floor and the cortical bone of the maxillary sinus floor was continuous (d=0 mm); Class Ⅲ : apical protrusion into the maxillary sinus floor(d＜0 mm). The thickness of the thickest part of the maxillary sinus floor mucosa was measured. The distance between the root and the maxillary sinus floor and the thickness of the maxillary sinus mucosa were compared under different root-sinus floor relationship, and the correlation analysis was performed. SPSS 26.0 software package was used to analyze the data. RESULTS: Among the 1974 maxillary sinuses of 987 patients, there were 450 maxillary sinuses with Class I relationship between the posterior root apex and the maxillary sinus floor, while 126 (28%) of the maxillary second molar proximal root and the maxillary sinus floor were the most closely related. In ClassⅠrelationship, the average distance from root to the maxillary sinus floor was (2.9±2.7) mm, and the average thickness of the maxillary sinus mucosa was (2.9±4.0) mm. There was no correlation between the distance from root to the maxillary sinus floor and the thickness of the maxillary sinus mucosa. There were 808 maxillary sinuses with ClassⅡ relationship between the posterior root apex and the maxillary sinus floor, among which 132 (16.3%) maxillary first molars had the closest relationship with the maxillary sinus floor. In Class Ⅱ relationship, the average thickness of the maxillary sinus mucosa was (3.0±4.6) mm. There were 249 maxillary sinuses with Class Ⅲ relationship between the posterior tooth root apex and the maxillary sinus floor, among which 87 (34.9%) palatal roots of the maxillary first molar were the most closely related to the maxillary sinus floor. The average distance from the root to the maxillary sinus floor was (-1.9±-1.4) mm, and the average thickness of maxillary sinus mucosa was (2.4±4.9) mm. There was a positive correlation between them (r=0.18, P=0.004). CONCLUSIONS: The most common relationship between the posterior maxillary tooth apex and the maxillary sinus floor is Class Ⅱ. The palatal root of the first molar is most closely related to the maxillary sinus floor, the mesiobuccal root of the second molar ranks second. The thickness of the maxillary sinus mucosa varies on the relationship between the different maxillary posterior teeth apex and the maxillary sinus floor. The average thickness of the maxillary sinus mucosa in Class Ⅲ is thicker than Class Ⅱ and Class I. In Class Ⅲ, as the distance from the apices to the maxillary sinus floor increases, the thickness of maxillary sinus mucosa increases.
[Retrospective analysis of 956 cases with dental trauma].
Li J, Zhao J, Wu T … +2 more , Tai Z, Dong Y
Shanghai Kou Qiang Yi Xue · 2025 Apr · PMID 40550773
PURPOSE: To find the clinical characteristics of permanent teeth trauma among young and adult people in Shanghai Ninth People's Hospital, and provide reference for the treatment and prevention of dental trauma among them...
PURPOSE: To find the clinical characteristics of permanent teeth trauma among young and adult people in Shanghai Ninth People's Hospital, and provide reference for the treatment and prevention of dental trauma among them. METHODS: The data of 956 patients who visited the Dental Trauma Clinic of Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine from September 2021 to March 2023 were collected and analyzed according to age, gender, occupation, causes of trauma, types of tooth injuries, number and position of affected teeth, time to seek treatment after injury, and whether the patients had been exposed to popular science knowledge related to tooth trauma. RESULTS: The male to female ratio of dental trauma patients was 0.93∶1. The tooth position with the highest incidence of dental trauma was the maxillary central incisor, followed by the maxillary lateral incisor. Subluxation and uncomplicated crown fractures were the subcategories with the highest incidence of dental trauma. For the post-traumatic treatment time, 55.54% of patients sought medical consultation within 1-4 hours. Survey of the occupation of patients with dental trauma found that high-risk exposure accounted for only 7%. Among them, the highest risk occupation were builders and men for takeaway. Falls and traffic accidents were the main causes of dental trauma. Only 8% of the patients received scientific knowledge related to dental trauma. CONCLUSIONS: Tooth injuries are more common in the upper incisors, and the types of injuries are more common in crown fractures and subluxations. The main causes are falls and traffic accidents. Dentists should strengthen the popularization of knowledge about dental trauma, and the public should pay attention to strengthening the rational use of mobile phones, raising road safety awareness, and learning emergency treatment methods for dental trauma.
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