The Angle Orthodontist[JOURNAL]
Sun
200 papers
Effect of orthodontic treatment on traumatized teeth treated by regenerative endodontic procedure.
Yoshpe M, Kaufman AY, Einy S
Angle Orthod · 2025 Mar · PMID 39805315 · Full text
OBJECTIVES: To evaluate the effect of orthodontic movement on traumatized teeth treated with the regenerative endodontic procedure (REP). MATERIALS AND METHODS: The increase of the radiographic root area (RRA) of each RE...
OBJECTIVES: To evaluate the effect of orthodontic movement on traumatized teeth treated with the regenerative endodontic procedure (REP). MATERIALS AND METHODS: The increase of the radiographic root area (RRA) of each REP tooth was measured at each follow-up visit after the end of orthodontic treatment. The study included two experimental groups of patients aged 7-17 with REP-treated teeth. The Ortho REP group consisted of eight patients who underwent orthodontic treatment, whereas the second group (no Ortho REP group) included seven patients who did not receive orthodontic treatment. The control groups comprised the same patients and their homologous or adjacent healthy teeth that did not undergo REP treatment. RESULTS: Orthodontic treatment did not negatively affect root development of immature, traumatized REP-treated teeth during the treatment or retention periods. Additionally, the increase in RRA in regenerated teeth was age-dependent, with the greatest RRA increase in young patients. CONCLUSIONS: Close collaborative endodontic-orthodontic follow-up is recommended to ensure favorable results. The findings suggest that REP-treated teeth may undergo orthodontic treatment without adverse effects.
Treatment effects of modified miniscrew-assisted rapid palatal expander and rapid palatal expander for molar distalization.
Park JH, Choi TH, Jang MJ … +2 more , Kim SY, Lee NK
Angle Orthod · 2025 Mar · PMID 39799973 · Full text
OBJECTIVES: To evaluate the treatment effects of the modified miniscrew-assisted rapid palatal expander (MARPE) and rapid palatal expander (RPE) with distalizers in patients with Class II malocclusion and maxillary crowd...
OBJECTIVES: To evaluate the treatment effects of the modified miniscrew-assisted rapid palatal expander (MARPE) and rapid palatal expander (RPE) with distalizers in patients with Class II malocclusion and maxillary crowding. MATERIALS AND METHODS: The sample comprised 28 skeletal Class I adolescents with dental Class II malocclusion and maxillary crowding of >4 mm who received nonextraction treatment. Fourteen patients were treated with a modified MARPE with distalizer (MMD), while another 14 patients were treated with a modified RPE with distalizer (MRD). Lateral cephalograms and study casts were taken at pretreatment (T1) and after expansion, distalization, and at the initiation of alignment (T2). Twenty-nine variables were compared using a Bonferroni-adjusted independent t-test and a Mann-Whitney U-test. RESULTS: From T1 to T2, the maxillary first molars in the MMD group exhibited distalization of 3.0 mm and 2.4 mm at the crown and root (P < .001) compared with 2.1 mm and 1.4 mm in the MRD group. However, no significant difference was found in distalization between the two groups. The first molars in the MRD group showed a significantly greater distal tipping of 2.8° than in the MMD group (P < .001). CONCLUSIONS: Although both groups showed maxillary molar distalization, the MMD group had no distal molar tipping, while there was significant molar tipping in the MRD group. It can be useful to plan nonextraction treatment with maxillary expansion and molar distalization in patients with Class II malocclusion and a narrow maxillary arch.
Anterior retraction with a canine implant in the way using clear aligner: a case report.
Zhang X, Lin P, Liao N … +2 more , Yuan Q, Li Y
Angle Orthod · 2025 Jan · PMID 39799970 · Full text
OBJECTIVE: A 26-year-old woman came for orthodontic treatment to improve her profile with protrusive lips. Diagnosed as bimaxillary protrusion, extraction followed by anterior retraction was indispensable for the case. H...
OBJECTIVE: A 26-year-old woman came for orthodontic treatment to improve her profile with protrusive lips. Diagnosed as bimaxillary protrusion, extraction followed by anterior retraction was indispensable for the case. However, her left upper lateral incisor was absent, the left upper canine had moved mesially and replaced the adjacent incisor, and the original canine location was restored with a long implant, which was in good condition. Surgical removal of the implant would be tricky and might lead to atrophy of the alveolar bone. In addition, the upper left central incisor had a short, curved root, which could not undergo significant movement. MATERIALS AND METHODS: After crucial discussion between orthodontists and implantologists, based on digital setup, an innovative treatment plan was developed. Four incisors were extracted followed by clear aligner therapy for anterior retraction. An individualized zirconia abutment was installed on the upper left implant in a retroclined direction, cemented with a zirconia crown to replace the upper lateral incisor. Minimally invasive veneers were made to reshape the other upper incisors for better esthetics. RESULTS: Finally, the patient had her profile greatly improved and the teeth well aligned without removal of the implant. CONCLUSION: Thus, the seemingly mission impossible was accomplished with a satisfactory outcome, thanks to imaginative treatment planning and delicate interdisciplinary collaboration based on digital simulation.
Does orthognathic surgery affect tooth root length and volume: a retrospective cohort study.
Erdem ME, Irgın C
Angle Orthod · 2025 Mar · PMID 39799969 · Full text
OBJECTIVES: To examine tooth root length and root volume in cone beam computed tomography (CBCT) images in patients with skeletal Class II and III anomalies who have undergone single-jaw (SJ) and double-jaw (DJ) orthogna...
OBJECTIVES: To examine tooth root length and root volume in cone beam computed tomography (CBCT) images in patients with skeletal Class II and III anomalies who have undergone single-jaw (SJ) and double-jaw (DJ) orthognathic surgery, and to compare the changes between jaws with and without osteotomy. MATERIALS AND METHODS: This study was conducted on the archive records of a total of 60 adults: 36 women and 24 men with an average age of 21.1 ± 3.1 years, whose CBCT images were recorded just before orthognathic surgery and within 6-12 months after surgery. The sample was divided into four groups with 15 individuals in each: Class II SJ (mandibular advancement only), Class II DJ (maxillary advancement and impaction with mandibular advancement), Class III SJ (maxillary advancement and impaction), and Class III DJ (maxillary advancement and impaction with mandibular setback). RESULTS: Within groups, statistically significant decreases in root length and root volume were found in the period between preorthognatic and postorthognathic surgery (P < .05). No statistically significant differences were found in comparisons between groups (P > .05). CONCLUSIONS: Regardless of the type of skeletal anomaly in the sagittal direction and the orthognathic surgery performed, a statistically significant but clinically insignificant decrease was found in tooth root length and root volume during the postorthognathic surgery period, both in jaws with and without osteotomy.
Craniofacial growth prediction models based on cephalometric landmarks in Korean and American children.
Kim JH, Moon JH, Roseth J … +3 more , Suh H, Oh H, Lee SJ
Angle Orthod · 2025 Mar · PMID 39799965 · Full text
OBJECTIVES: To compare differences in craniofacial growth prediction results for Korean and American children according to growth prediction models developed using Korean and American longitudinal growth data. MATERIALS...
OBJECTIVES: To compare differences in craniofacial growth prediction results for Korean and American children according to growth prediction models developed using Korean and American longitudinal growth data. MATERIALS AND METHODS: Growth prediction models based on cephalometric landmarks were built for each population using longitudinally taken lateral cephalograms of Korean children and American children of northern European origin. The sample sizes of the serial datasets were 679 and 1257 for Korean and American children, respectively. On each cephalogram, 78 cephalometric landmarks were identified. The prediction models were based on the partial least squares method with 160 input and 154 output variables. For each group, growth was predicted by applying the prediction models developed using data from the same and different populations. The growth prediction results were compared and analyzed. RESULTS: The growth prediction results obtained with the prediction model developed using data from the same population were more accurate (P < .0001). The results distinctively visualized the discrepancies in the growth prediction results if different population types were not considered. CONCLUSIONS: Applying a growth prediction model generated using data from the same population may be desirable.
Orthodontic treatment for preserving periodontally hopeless teeth in a middle-aged patient: a case report.
Giap HV, Kang SH, Paik JW … +2 more , Oh KC, Lee KJ
Angle Orthod · 2025 Jan · PMID 39799964 · Full text
In this case report, we show a strategic approach to prolonging the lifespan of pathologically migrated maxillary canines with a hopeless prognosis in a 57-year-old female patient, highlighting the potential of orthodont...
In this case report, we show a strategic approach to prolonging the lifespan of pathologically migrated maxillary canines with a hopeless prognosis in a 57-year-old female patient, highlighting the potential of orthodontic management for middle-aged patients to enhance both occlusion and facial esthetics while minimizing the need for extensive prosthetic treatment. According to the visual treatment objective, the nonextraction treatment plan showed advantages in the type of orthodontic tooth movement and final occlusal relationship. Therefore, considering the favorable periodontal treatment results and single-root teeth, the hopelessly migrated maxillary canines were relocated, eliminating the existing trauma from occlusion. Segmental tooth movement was performed, and orthodontic temporary skeletal anchorage devices were used to support strategic orthodontic tooth movement. After 27 months of treatment, proper occlusion was established with a significant improvement in facial esthetics. The periodontally compromised teeth were preserved with adequate periodontal support. The patient expressed satisfaction with the results, and the 30-month follow-up records confirmed the stability of treatment outcomes.
Building bridges from research outcomes to clinical practice decisions.
Chambers DW, Flores-Mir C
Angle Orthod · 2025 Mar · PMID 39721591 · Full text
Practitioners may face difficulties implementing research results into practice. Seven examples of common knowledge translation barriers for clinicians are presented, and suggestions are offered for building effective co...
Practitioners may face difficulties implementing research results into practice. Seven examples of common knowledge translation barriers for clinicians are presented, and suggestions are offered for building effective communication bridges. Changes in how research results are reported and interpreted across different practice contexts can improve orthodontic care. These include (a) attention to the expected benefit that includes estimates of both likely clinical value and probability of occurrence, (b) cost considerations, (c) generalizability across contexts that require interpretation adjustments, (d) measures of effect size in addition to measures of statistical significance, (e) determination of the largest relative sources of variance in the reported results, (f) estimating probabilities that lead to practice actions, and (g) conversion of research descriptions to values that impact practice decisions. Examples of improved communication relevant to clinicians are provided that can be used to build stronger bridges between orthodontic research and practice. Although advances in orthodontic research rigor have been noted, journal articles would benefit from more clinician-friendly descriptions of results and their impact.
Patients' perspectives of the long-term impact of orthodontic treatment: a qualitative study.
Mohammed H, Morsi A, Wafaie K … +2 more , Daniel BK, Farella M
Angle Orthod · 2025 Mar · PMID 39701134 · Full text
OBJECTIVES: To explore how orthodontic treatment affects different aspects of life, such as self-esteem, well-being, and social interactions and, additionally, to identify the long-term challenges that orthodontic patien...
OBJECTIVES: To explore how orthodontic treatment affects different aspects of life, such as self-esteem, well-being, and social interactions and, additionally, to identify the long-term challenges that orthodontic patients experience after treatment. MATERIALS AND METHODS: This qualitative study involved in-depth semistructured face-to-face interviews. A purposive sampling strategy aimed to recruit a representative cohort of orthodontic patients who had their orthodontic treatment in adolescence and had their treatment concluded at least 5 years previously. Twenty-one patients (13 females and 8 males) were interviewed using a prepiloted topic guide. These interviews were transcribed and analyzed verbatim, using the general inductive method of data analysis. RESULTS: The thematic analysis revealed four key themes and related subthemes: (1) self-confidence and interpersonal communication, (2) social and professional opportunities, (3) oral health and function, and (4) challenges. In-depth analysis revealed positive treatment outcomes regarding enhanced self-confidence, social interactions, and perceived improvement in oral health and function. It also highlighted ongoing challenges with retainers and dissatisfaction with relapse. CONCLUSIONS: Orthodontic treatment can significantly impact patient lives. Orthodontic patients described direct long-term positive effects on their social lives and well-being. However, it is equally important to remain mindful of the long-term challenges that may arise after treatment, especially with retainer choices and relapse, enabling proactive measures to mitigate their impact.
Evaluation of IL-8 and IL-6 levels in gingival crevicular fluid of individuals undergoing clear aligner therapy.
Altındal D, Tunca Y, Tunca M
Angle Orthod · 2025 Mar · PMID 39694050 · Full text
OBJECTIVES: To compare short-term changes in the levels of interleukin-8 (IL-8) and interleukin-6 (IL-6) in the gingival crevicular fluid (GCF) of individuals undergoing orthodontic treatment with clear aligners. MATERIA...
OBJECTIVES: To compare short-term changes in the levels of interleukin-8 (IL-8) and interleukin-6 (IL-6) in the gingival crevicular fluid (GCF) of individuals undergoing orthodontic treatment with clear aligners. MATERIALS AND METHODS: This study included 15 individuals. Each patient used clear aligners designed not to cause tooth movement in the GCF sampled teeth, to be changed every 10 days. GCF samples were collected from teeth 16 (upper right first molar) and 31 (lower left central incisor) at baseline and after the procedure at the first hour, third, seventh, 14th, and 21st days. In addition, clinical periodontal parameters for the full mouth and the teeth from which GCF was collected were recorded initially and on the 21st day. RESULTS: A statistically significant difference was observed between the levels of IL-8 before the procedure, on the third and seventh days, and on the 21st day (P < .01). The increase in IL-6 levels on the 14th and 21st days was significantly different compared to the levels before the procedure (P < .01). A positive correlation was detected between IL-8 and IL-6 levels at the first hour, a negative correlation on the third day, and a lower level of positive correlation on the seventh, 14th, and 21st days. CONCLUSIONS: Within 21 days, the levels of IL-8 and IL-6 significantly increased in individuals undergoing orthodontic treatment with clear aligners. Within the limits of this study, the clear aligner material may affect the levels of IL-8 and IL-6 in the GCF.
In vitro measurement of the initial forces and moments generated for a curve of Spee malocclusion with labial and lingual archwire forms.
Yeung S, Owen B, Heo G … +3 more , Carey JP, Major PW, Romanyk DL
Angle Orthod · 2025 Jan · PMID 39689862 · Full text
OBJECTIVES: To compare the biomechanics of labial and lingual fixed orthodontic treatment options for a simulated curve of Spee malocclusion. MATERIALS AND METHODS: An in vitro electromechanical orthodontic simulator was...
OBJECTIVES: To compare the biomechanics of labial and lingual fixed orthodontic treatment options for a simulated curve of Spee malocclusion. MATERIALS AND METHODS: An in vitro electromechanical orthodontic simulator was used to measure the three-dimensional forces and moments on each tooth of a mandibular arch. Labial and lingual brackets, both with 0.018-inch slot sizes, were bonded to mechanical teeth. Three archwire forms were considered: labial straight, lingual straight, and lingual mushroom. The simulator was set in a passive levelled position with 0.016-inch × 0.022-inch stainless steel archwires, then teeth were moved to a curve of Spee maloclussion with the first premolar intruded 1.5 mm and the canine and second premolar intruded 0.75 mm. Two-way mixed multivariate analysis of variance (α = 0.05) was used to compare forces and moments generated among the three archwires. RESULTS: Statistical differences were found in 55 of 63 comparisons of forces and moments between archwire types for each tooth around the arch. The lowest force magnitudes were measured for labial straight archwires at each tooth position. The lateral incisor experienced the largest gingival forces with all archwire forms. The first premolar and first molar experienced labial-lingual crown tipping moments in opposite directions between labial and the two lingual archwire forms. CONCLUSIONS: Biomechanical differences between labial, lingual straight, and lingual mushroom treatment modalities for the correction of curve of Spee misalignments were elucidated. Labial straight archwire exerted the lowest force magnitudes overall. For both lingual archwire forms, the labial-lingual inclination of the first premolar could be highly variable during levelling.
Evaluation of quality of life after orthognathic surgery in obstructive sleep apnea syndrome: a systematic review.
Francisco I, Travassos R, Baptista Paula A … +10 more , Oliveiros B, Marques F, Prata Ribeiro M, McEvoy M, Santos M, Oliveira C, Marto CM, Carrilho E, Nunes C, Vale F
Angle Orthod · 2025 Jan · PMID 39509465 · Full text
OBJECTIVES: To develop a systematic review of patient perspectives on the treatment of obstructive sleep apnea syndrome (OSAS) after undergoing orthognathic advancement surgery. MATERIALS AND METHODS: This systematic rev...
OBJECTIVES: To develop a systematic review of patient perspectives on the treatment of obstructive sleep apnea syndrome (OSAS) after undergoing orthognathic advancement surgery. MATERIALS AND METHODS: This systematic review adhered to the preferred reporting items for systematic reviews and meta-analysis (PRISMA) guidelines, and Patient, Intervention, Comparison, and Outcome (PICO) methodology was employed to formulate the research question. A literature search was performed using the following databases: Cochrane Library (Trials), PubMed via MEDLINE, Embase, and Web of Science (all databases). The Newcastle-Ottawa Scale was used to assess quality of the studies. RESULTS: Initially, 1407 articles were retrieved from diverse databases, and these were subjected to initial scrutiny. Subsequently, 17 articles were selected for thorough quality analysis and 6 studies for quantitative analysis. Most studies were classified as good quality. Maxillomandibular advancement surgery appeared to enhance patient satisfaction in cases of moderate to severe adult OSAS. CONCLUSIONS: Maxillomandibular advancement surgery significantly improves patients' subjective overall quality of life, improving by 6.36 points in questionnaire ratings and demonstrating long-term stability.
Incidence of unexpected condylar displacement following comprehensive orthodontic treatment in adults.
Jang H, Lee JH, Nguyen T … +2 more , Kim KH, Chung CJ
Angle Orthod · 2025 Mar · PMID 39428113 · Full text
OBJECTIVES: To evaluate the incidence and pattern of unexpected/excessive condylar displacement after comprehensive orthodontic treatment in adults. MATERIALS AND METHODS: Adult patients (age ≥18 years) who underwent com...
OBJECTIVES: To evaluate the incidence and pattern of unexpected/excessive condylar displacement after comprehensive orthodontic treatment in adults. MATERIALS AND METHODS: Adult patients (age ≥18 years) who underwent comprehensive orthodontic treatment with pre-(T1) and post-treatment (T2) cone beam computed tomography scans were consecutively collected within an orthodontic cohort (N = 291). T1 and T2 CBCTs were superimposed three-dimensionally (3D) and condylar displacement was estimated by the 3D changes of condylar neck point (CdN) between T1 and T2 (ΔCdN). Participants with excessive condylar displacement (ΔCdN >1 mm) were classified as condylar displacement (+) and otherwise as displacement (-). The incidence and pattern of condylar displacement, association with factors such as sex, age, skeletal relationship, extraction pattern, treatment duration, history of temporomandibular joint disorder, and presence of condylar resorption with the final occlusal outcome were investigated. RESULTS: The incidence of unexpected condylar displacement >1 mm in the adult orthodontic cohort was 6.2%. Females (vs males; OR: 9.07; [95% CI: 1.19-69.23]) and Skeletal Class II (vs Classes I and III; OR: 4.57 [95% CI: 1.58-13.20]) demonstrated significantly higher odds of unexpected condylar displacement (P < .05). Condylar resorption was not evident in participants with condylar displacement and did not interfere with the final orthodontic outcome. CONCLUSIONS: Unexpected 3D condylar displacement exceeding 1 mm was noted in approximately 6% of the adult orthodontic patient cohort. However, the condylar displacement per se was not associated with condylar resorption and did not cause clinical concerns.
Evaluation of the accuracy of digital indirect bonding vs. conventional systems: a randomized clinical trial.
Soares Ueno EP, de Carvalho TCADSG, Kanashiro LK … +4 more , Ursi W, Chilvarquer I, Neto JR, de Paiva JB
Angle Orthod · 2025 Jan · PMID 39389581 · Full text
OBJECTIVES: To compare the accuracy and chair time of self-ligating brackets using direct bonding, traditional indirect bonding (IB), and computer-aided design/computer-aided manufacturing (CAD/CAM) IB techniques after o...
OBJECTIVES: To compare the accuracy and chair time of self-ligating brackets using direct bonding, traditional indirect bonding (IB), and computer-aided design/computer-aided manufacturing (CAD/CAM) IB techniques after orthodontic leveling and alignment. MATERIALS AND METHODS: Forty-five patients were randomly assigned to three bonding groups (G1 [n = 15], G2 [n = 15], and G3 [n = 15]). Evaluation after the alignment and leveling phases used two parameters of the objective grading system of the American Board of Orthodontics for root parallelism and posterior marginal ridges, assessed using panoramic radiographies (PR I and PR II), a digital model, and a plaster model. Blinding was only applied for outcome assessment. No serious harm was observed except for gingivitis associated with plaque accumulation. RESULTS: Although G3 showed better numerical results, they were not statistically significant in the radiographic or model evaluations (P > .001). Mean chair time was significantly shorter in G3 (1.1 ± 11.8 min) vs. G1 (56.7 ± 7.3 min) and G2 (52.8 ± 8.3 min; P < .001). CONCLUSIONS: The CAD/CAM IB system for self-ligating brackets was as effective as conventional methods, with a shorter chair time.
An in vitro study of a combined patient-specific device for safe and accurate insertion of infrazygomatic crest miniscrews.
Du B, Wang X, Wang J … +5 more , Ji M, Yi Q, Jiang J, Tan J, Li J
Angle Orthod · 2025 Jan · PMID 39322232 · Full text
OBJECTIVES: To develop and assess the efficacy of a novel combined patient-specific device (CPSD) for the accurate and safe insertion of infrazygomatic crest miniscrews in orthodontic procedures. MATERIALS AND METHODS: T...
OBJECTIVES: To develop and assess the efficacy of a novel combined patient-specific device (CPSD) for the accurate and safe insertion of infrazygomatic crest miniscrews in orthodontic procedures. MATERIALS AND METHODS: Twenty-eight miniscrews were placed in the infrazygomatic crest region of 28 cadaver maxillae using the direct manual method (n = 14) or the CPSD (n = 14) based on preset trajectories. The CPSD, designed based on the integration model, included a positioning guide, an insertion guide, and a depth-limiting groove. Deviations in the insertion site, tip location, insertion angle, and biting depth between the preset and real insertion trajectories were calculated to evaluate the accuracy of miniscrew insertion. Classification frequencies of root proximity, sinus penetration depth, and biting depth of the miniscrew after insertion were also calculated to evaluate the safety of miniscrew insertion. RESULTS: Regarding evaluation of accuracy, significant differences were observed in the deviation values of the insertion site, tip location, insertion angle, and biting depth between the CPSD and freehand groups (P = .001, P < .001, P < .001, P = .039, respectively). Regarding evaluation of safety, a significant difference was observed in the classification frequencies of root proximity between the two groups (P = .016). CONCLUSIONS: Compared with manual insertion, CPSD could be a preferred method for safe and accurate insertion of infrazygomatic crest miniscrews for orthodontists.
Comparison between effects of reverse curve of Spee nickel titanium archwire and stainless steel archwires with and without torque on the lower incisors in deep overbite treatment: a randomized control study.
Shakhtour F, Al-Nimri K
Angle Orthod · 2025 Jan · PMID 39322231 · Full text
OBJECTIVES: To compare the effect between three different reverse curve of Spee (RCOS) archwires: 0.016 × 0.022-inch Nickel-Titanium and 0.019 × 0.025-inch stainless steel (SS) with and without crown labial torque (CLT)...
OBJECTIVES: To compare the effect between three different reverse curve of Spee (RCOS) archwires: 0.016 × 0.022-inch Nickel-Titanium and 0.019 × 0.025-inch stainless steel (SS) with and without crown labial torque (CLT) on lower incisors during deep overbite treatment. MATERIALS AND METHODS: Eighty subjects with deep overbite were randomly divided into three groups: the first group (mean age: 20.5 years) received SS RCOS with CLT, the second group (mean age: 19.4 years) was treated with 0.019 × 0.025-inch SS RCOS with zero CLT, the third group (mean age: 18.2 years) was treated with rocking-chair nickel-titanium (NiTi) 0.016 × 0.022-inch with RCOS. Two lateral cephalometric images were taken for each patient, one after alignment and the second after deep bite correction. These images were superimposed using the corpus axis to study the lower incisor horizontal and vertical changes. RESULTS: The lower incisor angular change was significantly smaller in Group II (-0.3°) compared to Group I (4.8°) and Group III (6.0°, P ≤ .001). Lower incisor anterior movement was reduced in Group II compared to Group I (P = .014) and Group III (P = .008). Group III showed significantly more downward movement of the lower Incisors (P ≤ .001). The three groups showed comparable amounts of true intrusion (1 mm, P = .536). CONCLUSIONS: 0.016 × 0.022-inch NiTi and 0.019 × 0.025-inch SS with crown labial torque RCOS archwires resulted in similar proclination and forward movement of the lower incisors. Removal of anterior crown labial torque from the 0.019 × 0.025-inch SS RCOS archwire prevents lower incisor proclination and forward movement.
Nonsurgical orthodontic treatment using bone-anchored maxillary protraction in a patient with unilateral cleft lip and palate.
Azami N, Farha P, Uribe F
Angle Orthod · 2024 Sep · PMID 39322230 · Full text
Class III malocclusion due to a retrognathic maxilla is common in patients with cleft lip and palate. Skeletally anchored maxillary protraction using screw-anchored mini-plates combined with intraoral elastics has shown...
Class III malocclusion due to a retrognathic maxilla is common in patients with cleft lip and palate. Skeletally anchored maxillary protraction using screw-anchored mini-plates combined with intraoral elastics has shown promising results in achieving orthopedic changes and maintaining the outcome until the completion of the growth. This case report presents the course of treatment in a patient with unilateral cleft lip and palate and multiple congenitally missing teeth treated with bone-anchored maxillary protraction until the end of growth. Four mini-plates (Bollard plates) were used during comprehensive fixed orthodontic treatment to protract the dentition and close the space where teeth were missing, extrude the canine, and force eruption of the second premolar using extension arms and cantilevers. A 2-year follow-up at age 17 showed stable occlusion and maintenance of soft tissue results. Bone-anchored maxillary protraction treatment in a patient with cleft lip and palate demonstrates proper orthopedic results and could be a viable alternative to orthognathic surgery.
Diagnostic performance of ClinCheck, Dolphin Imaging, and 3D Slicer software for Bolton discrepancy analysis.
Teixeira Santana T, Copello F, Marañón-Vásquez GA … +2 more , Issamu Nojima L, Franzotti Sant'Anna E
Angle Orthod · 2025 Jan · PMID 39317378 · Full text
OBJECTIVES: To evaluate the diagnostic performance of ClinCheck, Dolphin Imaging orthodontic software, and 3D Slicer for the analysis of Bolton discrepancy (BD). MATERIALS AND METHODS: Fifty-five pairs of early-stage dig...
OBJECTIVES: To evaluate the diagnostic performance of ClinCheck, Dolphin Imaging orthodontic software, and 3D Slicer for the analysis of Bolton discrepancy (BD). MATERIALS AND METHODS: Fifty-five pairs of early-stage digital models of patients treated with Invisalign were printed to measure the BD by manual method with a digital caliper (gold standard). The discrepancy values calculated by ClinCheck were obtained. In addition, the sample STL files were measured using Dolphin Imaging and 3D Slicer software to obtain BD values. To assess reliability, precision, and accuracy of the methods, intraclass correlation coefficients (ICCs), Dahlberg's formula, paired t-tests, and the Bland-Altman method were used, respectively. Repeated-measures analysis of variance with Bonferroni post hoc test was used to assess the difference between groups. RESULTS: The three methods showed reliable measurements (ICC ≥ 0.7), with the values of anterior Bolton slightly higher than overall Bolton. Measurements for the anterior Bolton showed higher precision (Dahlberg's formula 0.65, 0.70, and 0.55) than those for the overall Bolton. For anterior Bolton, only the measurements obtained by ClinCheck and Dolphin Imaging were accurate (P > .05, no proportion bias), while for overall Bolton, all groups had a significant difference. The Bland-Altman plots demonstrated no consistency for anterior Bolton measurements when 3D Slicer was used and for the overall Bolton. CONCLUSIONS: ClinCheck and Dolphin Imaging showed accuracy to quantify anterior BD. For the overall Bolton measurements, ClinCheck showed a statistical difference from the manual assessment but without relevant clinical significance.
Harmonizing soft tissue subnasale and chin position in a forehead-based framework: interracial commonalities and differences between Asian and Caucasian females.
Chen T, Yang X, Xue C … +2 more , Bai D, Xu H
Angle Orthod · 2025 Jan · PMID 39317377 · Full text
OBJECTIVES: To establish a reference system for assessing the anteroposterior (A-P) position of the subnasal and lower-facial soft tissues for whole facial harmony. MATERIALS AND METHODS: Forty Asian and 40 Caucasian fem...
OBJECTIVES: To establish a reference system for assessing the anteroposterior (A-P) position of the subnasal and lower-facial soft tissues for whole facial harmony. MATERIALS AND METHODS: Forty Asian and 40 Caucasian females with attractive profiles were selected as the "attractive" samples, with "ordinary" samples for comparison. Each profile was analyzed, and comparisons were made to reveal the interracial commonalities and differences. Esthetically essential parameters were established. An averaged attractive profile for each race was created by digital morphing and then modified into 30 variations based on combined variations of the esthetically essential parameters. Assessments were performed to investigate the esthetic ranges. RESULTS: A-P position of the subnasal and lower-facial landmarks harmonized with the forehead for female profile esthetics. In addition to balanced soft tissue subnasale (sSn)- and soft titssue pogonion (Pos)-to-forehead A-P relations, harmonizing lower-facial soft tissues to sSn was indispensable for profile attractiveness. sSn-to-glabella, Pos-to-glabella, and Pos-to-sSn A-P relations were esthetically essential. Perceived by orthodontists, the attractive Asian female profiles had sSn-to-glabella A-P relations ranging from 0.5 mm to 4.5 mm, Pos-to-sSn from -9.0 mm to -5.5 mm, and Pos-to-glabella from -8.5 mm to -1.0 mm. Compared with Asians, the attractive Caucasian female profiles had more anteriorly and widely distributed sSn relative to the forehead, wider ranges of Pos-to-sSn A-P relations, and more prominent chins. CONCLUSIONS: A reference system comprising sSn-glabella, Pos-sSn, and Pos-glabella horizontal distances was constructed for facial profile analysis. This system could aid treatment planning for surgical or orthopedic repositioning of the maxilla and chin.
Reliability assessment of craniofacial and airway measurements: a comparative study between multidetector computed tomography and cone-beam computed tomography.
Sun JS, Hung MC, Hsieh CY … +3 more , Lin SY, Tai HC, Chang JZ
Angle Orthod · 2025 Jan · PMID 39317376 · Full text
OBJECTIVES: To compare the intra- and inter-examiner reliability of multidetector computed tomography (MDCT) and cone-beam computed tomography (CBCT) using Amira and Dolphin software analyses for craniofacial/airway meas...
OBJECTIVES: To compare the intra- and inter-examiner reliability of multidetector computed tomography (MDCT) and cone-beam computed tomography (CBCT) using Amira and Dolphin software analyses for craniofacial/airway measurements by six examiners. MATERIALS AND METHODS: Five adults and one dry skull with CBCT and MDCT scan files were duplicated and randomly numbered. Six orthodontic residents imported these files into two software programs, oriented the images, set thresholds, and performed 26 measurements. Intra- and inter-examiner reliabilities were determined by using intraclass correlation coefficient (ICC) and presented with scatterplots. RESULTS: Variables including anterior nasal width, posterior nasal width, frontomaxillary suture right-to-left, inner nasal contour point right-to-left, and minimum cross-sectional area in the oropharynx showed "moderate" to "substantial" intra- or inter-examiner agreement. Amira provided relatively reliable airway assessment, while Dolphin showed standard deviations 10 to 30 times larger for volumetric airway measurements. MDCT scans significantly reduced airway volume/area measurements compared to CBCT, except for intraoral airway volume. CONCLUSIONS: Unreliable skeletal measurements and low reliability of Dolphin for airway analysis discourage using CT to quantitatively correlate changes in craniofacial structures with airway dimensions.
Efficacy of planned moderate to severe torque changes in mandibular central incisors with an initial series of Invisalign aligners: a retrospective cohort study.
Rajan N, Weir T, Meade MJ
Angle Orthod · 2025 Jan · PMID 39313216 · Full text
OBJECTIVES: To determine whether the achieved mandibular central incisor lingual root torque (LRT) changes matched the planned changes after treatment with an initial series of Invisalign aligners when ≥10° of torque cha...
OBJECTIVES: To determine whether the achieved mandibular central incisor lingual root torque (LRT) changes matched the planned changes after treatment with an initial series of Invisalign aligners when ≥10° of torque change was planned. MATERIALS AND METHODS: A sample of adult patients who underwent treatment with the Invisalign appliance between 2013 and 2021 were evaluated. The pretreatment, planned, and achieved posttreatment digital models were measured using Geomagic Control X metrology software. The effect of age, number of prescribed aligners, sex, the presence of power ridges (PRs), and differing weekly wear protocols (WPs) in relation to the achieved LRT changes were determined. RESULTS: Seventy mandibular central incisors from 35 patients satisfied inclusion criteria. The accuracy of the achieved lower incisor LRT compared with that planned was 58.2%. Underexpression of planned torque changes was observed in most incisors (N = 66; 94.3%), with a clinically significant shortfall (≥5°) observed in 68.6% (N = 42) teeth. Patient age, sex, the WP, or the presence of PRs did not influence the differences between planned and achieved outcomes (P > .05). The prescribed number of aligners was influential in the difference between the planned and achieved torque outcomes (P < .01). CONCLUSIONS: Underexpression of mandibular central incisor root torque was observed in most incisors in patients when ≥10° change in LRT was planned. Lower incisor LRT was not significantly affected by the presence of PRs or differences in WPs.
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