Dental Press Journal of Orthodontics最新文献

{"title":"Facial profile attractiveness in orthodontically treated Class III malocclusion patients: a comparison of extraction and non-extraction protocols.","authors":"Maria Pia Seminario, Rodrigo Naveda, Guilherme Janson, Arnaldo Pinzan, Aron Aliaga-Del Castillo, Silvio Augusto Bellini-Pereira","doi":"10.1590/2177-6709.31.1.e2625219.oar","DOIUrl":"10.1590/2177-6709.31.1.e2625219.oar","url":null,"abstract":"<p><strong>Introduction: </strong>The treatment of Class III malocclusion has an important impact on facial and smile esthetics.</p><p><strong>Objective: </strong>To compare the facial profile attractiveness (FPA) of Class III malocclusion patients treated with and without premolar extractions.</p><p><strong>Material and methods: </strong>A retrospective sample of 39 Class III malocclusion patients was divided into two groups: Non-extraction group, composed of 20 patients (8 males, 12 females; mean age: 13.7 years); and the Extraction group, comprising 19 patients (9 males, 10 females; mean age: 15.0 years). Both groups were treated with orthodontic fixed appliances. Facial profile silhouettes were created from the pretreatment and posttreatment lateral cephalometric radiographs. The silhouettes were evaluated by 30 laypeople (20 males, 10 females; mean age: 32.2 years) and 29 orthodontists (13 males, 16 females; mean age: 48 years). The evaluators rated FPA using a scale ranging from 1 (least attractive) to 10 (most attractive). Intergroup comparisons of FPA between treatment protocols and evaluators were performed using Mann-Whitney tests. For intragroup comparisons of pre- and posttreatment stages, Wilcoxon tests were performed.</p><p><strong>Results: </strong>The extraction group was statistically more attractive in the pretreatment stage, when compared to the non-extraction group. Both groups showed no significant differences in the intragroup comparisons of pre- and posttreatment stages. Laypeople rated FPA significantly lower than orthodontists at both stages.</p><p><strong>Conclusion: </strong>Class III malocclusion patients treated with and without extractions presented similar FPA at the posttreatment stage. No differences were observed for the FPA in the intragroup comparisons of pre- and posttreatment stages. Orthodontists were significantly less critical than laypeople.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"31 1","pages":"e2625219"},"PeriodicalIF":0.0,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13137967/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147844127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dimensional stability of 3D-printed models for orthodontic aligners: a six-month storage evaluation.","authors":"Paulo Mateus Pereira Sousa, Karina Oliveira Lustosa, Dalila Mikaelly Ribeiro Luz, Iara da Costa Araújo Barros, Edson Ferreira DA Silva, Alexandre Henrique de Melo Simplício, Wagner Leal DE Moura, Marcus Vinicius Neiva Nunes DO Rego","doi":"10.1590/2177-6709.31.1.e2625115.oar","DOIUrl":"10.1590/2177-6709.31.1.e2625115.oar","url":null,"abstract":"<p><strong>Objective: </strong>This study aimed to analyze the dimensional stability of 3D resin-printed models for orthodontic aligners under specific storage conditions over a period of up to six months.</p><p><strong>Methods: </strong>A model of the upper arch of a dental mannequin (Orbital Bone) was scanned using the 3Shape Trios 3 scanner, to create digital models (n = 20), which were printed on the Anycubic Photon X6 KS printer and stored in a dark box at room temperature for six months. Dimensional analysis was performed by comparing the meshes of the models through superimposition at the following time points: T0 - immediately after printing (control group), T1 - 1 month, T2 - 3 months, and T3 - 6 months of storage. The Ortho Analyser software was used for this purpose, and measurements were performed by a single, trained examiner. After confirming normality (p > 0.05, Shapiro-Wilk test), Analysis of Variance (ANOVA) was applied to verify dimensional changes in the following regions of the dental arch: incisors, canines, premolars, and molars.</p><p><strong>Results: </strong>Dimensional changes in the models were not statistically significant (p > 0.05) during the storage period for all evaluated regions. However, the greatest dimensional changes occurred during the first month and in the molar region (0.175 mm), which showed a tendency to expand.</p><p><strong>Conclusions: </strong>After six months of storage in a light-free environment, the 3D-printed models exhibited minor dimensional changes, which may have some clinical impact on aligner treatment, particularly in the molar region.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"31 1","pages":"e2625115"},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13090032/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147784171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation and comparison of antimicrobial property of chitosan nanoparticles on nickel-titanium archwires: an in vivo study.","authors":"Jainil Patel, Padmaja Sharma, Kalpesh Patel","doi":"10.1590/2177-6709.31.1.e2625184.oar","DOIUrl":"10.1590/2177-6709.31.1.e2625184.oar","url":null,"abstract":"<p><strong>Introduction: </strong>Fixed orthodontic appliances can serve as a breeding ground for bacterial accumulation and colonization, which are responsible for the development of white spot lesions (WSLs).</p><p><strong>Objective: </strong>This study evaluated and compared the antibacterial activity of chitosan nanoparticle-coated and uncoated nickel-titanium (NiTi) orthodontic archwires against Streptococcus mutans (S. mutans) and Lactobacillus acidophilus (L. acidophilus).</p><p><strong>Material and methods: </strong>Thirty patients received 0.016-in NiTi archwires, using a split-mouth design. Sixty archwires were randomized into two groups: Group A, nanochitosan-coated (n = 30, experimental), and Group B, uncoated (n = 30, control). Allocation was determined using sequentially numbered, opaque, sealed envelopes prepared by an independent researcher, with assignments concealed until allocation. The ionic gelation technique was used for coating. After six weeks in the oral cavity, archwires were retrieved, and bacterial presence was evaluated as Colony Forming Units (CFUs), through culture formation.</p><p><strong>Results: </strong>A statistically significant difference was observed in the mean CFU counts of S. mutans and L. acidophilus between the experimental and control groups (p < 0.001). The mean CFU values for S. mutans were 0.12 × 106 CFU/ml (SD ± 0.38; experimental) and 1.82 × 106 CFU/ml (SD ± 0.69; control). For L. acidophilus, mean CFUs were 0.036 × 106 CFU/ml (SD ± 0.06; experimental) and 1.96 × 106 CFU/ml (SD ± 0.65; control).</p><p><strong>Conclusion: </strong>Orthodontic archwires coated with nanochitosan demonstrated significantly greater antimicrobial activity against S. mutans and L. acidophilus compared with uncoated archwires.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"31 1","pages":"e2625184"},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13090025/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147784192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orthodontic creative mechanics.","authors":"Andre Wilson Machado","doi":"10.1590/2177-6709.31.1.e26spe1","DOIUrl":"10.1590/2177-6709.31.1.e26spe1","url":null,"abstract":"<p><strong>Introduction: </strong>In-depth knowledge of orthodontic mechanics is a mandatory aspect for all orthodontists, regardless of the technique, material, or appliance used. Following this reasoning, in addition to notorious knowledge, the clinician needs to be creative to deal with the countless possibilities inherent to clinical diversity.</p><p><strong>Objective: </strong>The objective of this article is to present 10 clinical situations in which the orthodontist's inventive capacity is a fundamental element in selecting ideal mechanics to solve different clinical challenges.</p><p><strong>Results: </strong>Incorporating creativity enabled efficient resolution of all clinical situations.</p><p><strong>Conclusions: </strong>Stimulating creativity is essential to prepare professionals capable of innovating responsibly.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"31 1","pages":"e26spe1"},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13090029/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147784303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of carbonated drinks, alcoholic drinks and mouthwashes with varying pH on mechanical properties and colour stability of various thermoplastic retainers, aligners and occlusal splints: an in-vitro study.","authors":"Mahulkar Niharika, Vizia Muddada, Navya Puvvula, Payal Jyoti Dash, Limasunep Jamir, Udayadityeshwari Gali, Bandela Anand Babu, Pentapalli Prasanthi","doi":"10.1590/2177-6709.31.1.e2625178.oar","DOIUrl":"10.1590/2177-6709.31.1.e2625178.oar","url":null,"abstract":"<p><strong>Introduction: </strong>Thermoplastic materials used for retainers, aligners, and occlusal splints may degrade when exposed to common beverages and mouthwashes, affecting mechanical properties and aesthetics.</p><p><strong>Objective: </strong>To evaluate the effects of carbonated drinks, alcoholic beverages (brandy), and mouthwashes on the mechanical properties and colour stability of various orthodontic thermoplastics.</p><p><strong>Material and methods: </strong>A total of 144 samples from six thermoplastic materials (Erkodur, Duran, Erkodur-Al, CA Pro+, Erkoflex, Bioplast) were immersed daily for 10 minutes over 14 days in artificial saliva, brandy, carbonated drink, or chlorhexidine mouthwash. Mechanical properties (yield strength, stiffness, elastic modulus) were measured via universal testing machine; colour changes (ΔE) were assessed with a colorimeter. One-way ANOVA was used for statistical analysis (p < 0.05).</p><p><strong>Results: </strong>Retainers immersed in saliva exhibited highest yield strength (Erkodur: 61.95 ± 4.21; Duran: 59.25 ± 3.12) and stiffness (Erkodur: 2.12 ± 0.19; Duran: 2.12 ± 0.23), with lowest values in carbonated drinks (Erkodur: 48.88 ± 3.32 ; Duran: 48.45 ± 5.77). Aligners and occlusal splints followed similar trends; Bioplast splints performed best mechanically (saliva: 63.05 ± 4.36 ; stiffness: 1.98 ± 0.13). Colour changes were greatest in alcoholic beverages, notably Duran (ΔE: 0.978 ± 0.21, p = 0.010) and Erkoflex (ΔE: 1.21 ± 0.06, p = 0.003); aligners and Bioplast showed minimal ΔE differences.</p><p><strong>Conclusion: </strong>Acidic and alcoholic beverages significantly reduce mechanical strength and compromise aesthetics of thermoplastic orthodontic appliances. Bioplast exhibited superior mechanical performance among splints, while aligners demonstrated minimal discoloration. Patient education on limiting exposure to such beverages is crucial to maintain appliance durability and optimal treatment outcomes.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"31 1","pages":"e2625178"},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13090024/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147784231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of different levels of diastema and crowding on the precision of 3D-printed dental models: a comparative analysis using digital superimposition.","authors":"Farhad Salmanpour, Hasan Camci","doi":"10.1590/2177-6709.31.1.e2624241.oar","DOIUrl":"10.1590/2177-6709.31.1.e2624241.oar","url":null,"abstract":"<p><strong>Introduction: </strong>This study aimed to evaluate the impact of varying degrees of anterior diastema and crowding on the precision of 3D-printed dental models using digital superimposition techniques.</p><p><strong>Materials and methods: </strong>A digital maxillary arch model was modified in the anterior region (canine to canine) to simulate three levels of diastema (2.5 mm, 5 mm, 10 mm) and four levels of crowding (3 mm, 6 mm, 9 mm, 12 mm), along with an unmodified control. Eight digital models were fabricated using LCD 3D printing, with 15 prints per group. Printed models were scanned and superimposed onto their respective reference models using Geomagic Control X. Surface deviations were analyzed via minimum, maximum, root mean square (RMS), and average positive and negative values. One-way ANOVA and Tukey's HSD post-hoc test were used for statistical evaluation.</p><p><strong>Results: </strong>Significant differences were observed among diastema groups (p < 0.05), with the 5 mm group showing the widest deviation range. RMS and average deviation values were highest in the 2.5 mm and 5 mm diastema conditions. In the crowding groups, significant deviations in minimum and maximum values occurred only in the 12 mm group (p < 0.001 and p < 0.008, respectively).</p><p><strong>Conclusion: </strong>Severe anterior crowding (12 mm) and mild to moderate diastemas (≤5 mm) significantly impair the precision of 3D-printed dental models. These results highlight the importance of assessing digital model fidelity in cases with anterior spacing or crowding, to ensure accurate diagnosis and appliance fabrication.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"31 1","pages":"e2624241"},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13090023/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147784229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficacy of a simplified photobiomodulation protocol in orthodontic patients: a randomized crossover clinical trial.","authors":"Mylka Suellen de Moura Barros Santos, Renata Travassos da Rosa Moreira Bastos, Nathália Carolina Fernandes Fagundes, David Normando","doi":"10.1590/2177-6709.31.1.e2625100.oar","DOIUrl":"10.1590/2177-6709.31.1.e2625100.oar","url":null,"abstract":"<p><strong>Introduction: </strong>Pain in orthodontic treatments results from an inflammatory process due to the application of forces. Despite photobiomodulation having shown effectiveness in reducing pain sensitivity, the method requires multiple sessions, which complicates its practical application in orthodontic clinics.</p><p><strong>Objective: </strong>To test a simplified protocol of photobiomodulation with a single application in adults undergoing orthodontic treatment.</p><p><strong>Material and methods: </strong>This single-blind, randomized, crossover study evaluated 30 participants undergoing fixed orthodontic treatment. Half of them received a single application of photobiomodulation, while the other half received a placebo, with group crossover after one month. The application was performed at 10 points using a GaAlAs diode laser (100 mW/cm2) immediately after appliance activation. Pain was assessed using a visual analog scale (VAS) at T0 (before the orthodontic check-up appointment), T24h (24 hours after the orthodontic control appointment), and T48h (48 hours after the orthodontic control appointment), and data were analyzed using two-way repeated measures ANOVA (time and intervention).</p><p><strong>Results: </strong>A total of 27 participants were evaluated. Pain was significantly higher at T24h than at T48h in both groups. Although there was no difference in pain sensitivity between the groups at T24h, pain significantly decreased in the intervention group after 48 hours. The variables of sex and age did not influence pain perception.</p><p><strong>Conclusion: </strong>The study shows that photobiomodulation can help control orthodontic pain, being well accepted by participants and not extending clinical time. However, the analgesic effects are still limited, indicating the need to refine the protocol to enhance its effectiveness.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"31 1","pages":"e2625100"},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13090033/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147784247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Midpalatal suture split after differential and fan-type expansion: a secondary analysis from a randomized clinical trial.","authors":"Daniela Garib, Rodrigo Teixeira, Rafaela Lopes Chacon, Ana Lúcia Alvares Capelozza, José Roberto Pereira Lauris, Camila Massaro","doi":"10.1590/2177-6709.30.6.e2525156.oar","DOIUrl":"10.1590/2177-6709.30.6.e2525156.oar","url":null,"abstract":"<p><strong>Objective: </strong>To compare the opening of the midpalatal suture after rapid maxillary expansion (RME) with the expander with differential opening and the fan-type expander.</p><p><strong>Methods: </strong>Rapid maxillary expansion was performed with the expander with differential opening (n=12, 8 female, 4 male, mean age of 7.75 years) and the fan-type expander (n=12, 8 female, 4 male, mean age 8.08 years). CBCT scans were acquired before (T1) and immediately after (T2) the expansion. The outcomes comprised the opening of the midpalatal suture in the anterior and posterior nasal spine. Intergroup comparisons were performed with t or Mann-Whitney U tests (P<0.05).</p><p><strong>Results: </strong>All patients showed a midpalatal suture opening with greater increases in the anterior nasal spine compared to the region of the posterior nasal spine. The split in the anterior nasal spine was similar in both groups (P=0.153), while the opening in the posterior nasal spine was 1 mm greater in the differential expansion group (P<0.001). The greater increase in the anterior region of the midpalatal suture in both groups suggested a trapezoidal shape split.</p><p><strong>Conclusions: </strong>The expander with differential opening and the fan-type expander were capable of splitting the midpalatal suture in the mixed dentition. Despite both appliances showed similar opening in the anterior nasal spine, a greater expansion in the posterior region of the midpalatal suture was observed with the expander with differential opening.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"30 6","pages":"e2525156"},"PeriodicalIF":0.0,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12904135/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146229090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of varying anchorage force intensity on upper molar distalization using clear aligners: a finite element study.","authors":"Douglas Teixeira da Silva, Weber José da Silva Ursi, Carlos Flores-Mir, Ki Beom Kim, Guilherme de Araújo Almeida","doi":"10.1590/2177-6709.30.6.e2525313.oar","DOIUrl":"10.1590/2177-6709.30.6.e2525313.oar","url":null,"abstract":"<p><strong>Introduction: </strong>This study investigated the effects of maxillary molar distalization using clear aligners and skeletal anchorage, specifically examining the influence of varying anchorage force levels through 3D finite element modeling.</p><p><strong>Method: </strong>Eight models were developed, systematically varying anchorage force (1.66 N and 3.34 N) from infrazygomatic crest (IZC) screws, force application site (precision cuts or buttons), and the presence or absence of vertical rectangular attachments. A 0.2 mm activation was applied between the first and second molars.</p><p><strong>Results: </strong>Results indicated that variations in anchorage force did not significantly alter the displacement of the second molars or anterior teeth (canines and central incisors) across the X, Y, and Z axes, provided the force application site and attachments remained constant. However, changing these variables led to observable differences in displacement. Notably, models employing precision cuts and vertical attachments showed second molar distalization, expansion, and extrusion. Additionally, canines displayed reduced mesial crown displacement and intrusion, while central incisors moved labially with less intrusion.</p><p><strong>Conclusions: </strong>Overall, none of the combinations tested were sufficient to prevent some anchorage loss or unwanted tooth movement. Variations in anchorage force did not significantly affect the extent of second molar distalization or anterior anchorage loss. However, the precision cuts and vertical attachments on molars and premolars resulted in different and more pronounced unwanted displacements.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"30 6","pages":"e2525313"},"PeriodicalIF":0.0,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12904137/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146229037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the relationship between facial, skeletal, dental and smile asymmetries: a preliminary investigative analysis.","authors":"Fernanda de Souza do Nascimento Diogo, Karoline de Melo Magalhães, Luísa Schubach da Costa Barreto, Paolla Barboza Araujo de Almeida, Guido Artemio Marañón-Vásquez, Luciana Rougemont Squeff, Matilde da Cunha Gonçalves Nojima","doi":"10.1590/2177-6709.30.6.e2524202.oar","DOIUrl":"10.1590/2177-6709.30.6.e2524202.oar","url":null,"abstract":"<p><strong>Objective: </strong>This study aimed to investigate the relationship between asymmetrical faces, smiles, skeletal parameters and dental asymmetries.</p><p><strong>Material and methods: </strong>A total of 20 patients with normal vertical facial pattern (20≤FMA≤30°) were selected to analyze frontal extraoral photographs with natural smiles and 3D frontal images generated by cone beam computed tomography scans (CBCT scans). The facial symmetry was retrieved by tracing the bipupillary line and perpendicular lines, the distance between the right and left frontolacrimal sutures was subsequently transferred to the same area in the photographs (the intercanthal distance) to calibrate all measures in the study. An assessment of mandibular chin deviation was conducted, and lines were traced to evaluate the dental midline and smile parameters. Through the manipulation of the CBCT scan, the presence of malocclusion and its respective subdivision, as well as the presence of unilateral or bilateral posterior crossbites in each patient, were identified. Data normality was checked using the Shapiro-Wilk test, and univariate linear regressions were performed to assess relationships.</p><p><strong>Results: </strong>Individuals with Menton point (Me point) deviation greater than 3.5 mm were considered asymmetrical. Subdivision malocclusions significantly correlated with upper midline dental deviation (UMLDD; R2= 0.25), with individuals without subdivision malocclusions showing 0.66 mm less deviation (95% CI = -1.24, -0.09; P = 0.026).</p><p><strong>Conclusion: </strong>UMLDD have a significant correlation with subdivision malocclusion.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"30 6","pages":"e2524202"},"PeriodicalIF":0.0,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12904139/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146229052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}