dente torto
ffs lela 
eu achava que seu caso não era tão sério assim 
Já ouvi que japonesa com dentes alinhados é só aquela que fez tratamento ortodôntico, mas nunca li dados concretos a respeito. Fiz uma pesquisa rápida e achei este estudo comparando japoneses e americanos, que na discussão (não deu para copiar) sugere que a diferença seja pela falta de disponibilidade de tratamento ortodôntico.
Clinical assessment of orthodontic outcomes with the peer assessment rating, discrepancy index, objective grading system, and comprehensive clinical assessment
American Journal of Orthodontics and Dentofacial Orthopedics, Volume 127, Issue 4, Pages 434-443
T.Deguchi, T.Honjo, T.Fukunaga, S.Miyawaki, W.Roberts, T.Takano-Yamamoto
Abstract
Purpose: The purpose of this study was to quantitatively assess orthodontic treatment outcomes in postgraduate orthodontic clinics at Okayama University (OU) and Indiana University (IU). Material: Using the peer assessment rating (PAR) index, the discrepancy index (DI), the American Board of Orthodontist’s objective grading system (OGS), and the comprehensive clinical assessment (CCA), we evaluated pretreatment and posttreatment records of 72 patients from OU and 54 patients from IU. Results: The average pretreatment PAR score with United Kingdom weighting was 32 for OU subjects and 28 for IU subjects. Differences in maxillary and mandibular buccal alignment between schools were statistically significant (P < .01). The posttreatment PAR scores were 7 for OU and 4 for IU. The difference in overjet between schools was statistically significant (P < .05). The mean DI scores were 19 for OU and 17 for IU. OU patients scored significantly more DI points for crowding and mandibular plane angle compared with IU patients (P < .05). On the other hand, they lost significantly fewer DI points for overbite and occlusion compared with IU patients (P < .05). The mean OGS scores were 34 for OU and 33 for IU. Buccolingual inclination and overjet scores were significantly higher in OU patients compared with IU (P < .05). The mean CCA score was approximately 4 points for both OU and IU. Conclusions: These data suggest that these indexes are useful for comparing treatment outcomes between clinics. They were able to identify specific problems in treating Asian patients.
Já neste, onde compararam coreanos e euro-americanos, sugerem que a causa da diferença seja genética e/ou ambiental.
Comparison of Mandibular Morphology in Korean and European-American Children with Class III Malocclusions using Finite-Element Morphometry
G. D. Singh, J. A. McNamara, Jr and S. Lozanoff
Abstract
The purpose of this study was to determine whether the morphology of the mandible differed in subjects of diverse ethnic origin exhibiting Class III malocclusions. Lateral cephalographs of 147 children of either Korean or European-American descent aged between 5 and 11 years were compared. The cephalographs were subdivided into seven age- and sex-matched groups, traced, and eight mandibular homologous landmarks digitized. Average mandibular geometries, scaled to an equivalent size, were computed using Procrustes superimposition and subjected to ANOVA. Graphical analysis using a colour-coded finite element (FEM) programme was used to localize differences in morphology. Results indicated that the overall mean Korean and European-American mandibular configurations differed statistically (P < 0.001) and statistical difference was maintained at all age-wise comparisons. Comparing Korean and European-American Class III mandibular configurations for local size-change, FEM analysis revealed that the Korean condylar and mental regions generally were smaller (15–20 per cent decrease in size, respectively). However, an antero-posterior increase in the size of the mandibular corpus was most apparent in the incisor alveolus region (35 per cent increase in size). For shape-change, the Korean and European-American mandibular configurations were fairly isotropic except in the symphyseal and incisor alveolus regions. Dissimilarities in mandibular morphology are identifiable particularly in the dento-alveolar regions in subjects of diverse ethnic origin exhibiting Class III malocclusions. These differences may reflect genetic and/or environmental influences that might determine the severity and prevalence of the condition, and its subsequent clinical management.
Espero não ter arruinado o tópico...
