Dental Arch Dimensions in Class II division 1 Malocclusions with Mandibular Deficiency

Abstract

Objective: To test the hypothesis that there is no difference in the dimensions of the upper and lower dental arches in Class II division 1 malocclusion with a mandibular deficiency compared to normal Class I occlusion dental arches. Materials and Methods: Photocopies of the dental arches of 48 patients exhibiting Class II division 1 malocclusion with mandibular deficiency and of 51 individuals with normal occlusion were compared. Mandibular deficiency was diagnosed clinically. All 99 individuals were in the permanent dentition. The ages of the subjects ranged from 11 years 4 months to 20 years (mean age ϭ 12 years 5 months). Results: When compared to subjects with normal occlusion, the upper dental arches of the Class II division 1 patients presented reduced transverse dimensions and longer sagittal dimensions while the lower arches were less influenced. Conclusion:The hypothesis is rejected. Significant differences are present between the dimensions of the upper and lower dental arches in Class II division 1 malocclusion (with a mandibular deficiency and in the permanent dentition) compared to normal Class I occlusion dental arches.

Study of the relationship between overjet development and some skull bone measurements in Warmblood foals

“…Overjet in human medicine is classified as a class II, division 1 malocclusion, but the exact prevalence of overjet in humans is difficult to determine because of ethnic differences between sampled populations, and varies from 8.6 to 33.7 per cent 16. Genetic and environmental factors also appear to be related to the aetiology of this malocclusion in humans, including soft diet, mouth breathing, tongue thrusting, sleeping posture, sucking, skeletal growth disturbances, muscle dysfunction or disturbances in embryological and dental development 17.…”

Programa de extrações seriadas: variáveis relacionadas com a extração de pré-molares

“…With Pattern II accompanied by Class II, Division 1 malocclusion, one must also consider the atresia of the upper dental arch, which can be expanded, especially in treatment involving the orthopedic advancement of the mandible. 18 In the present study, patients with Patterns I and II were grouped together for the statistical analysis and there was a small number of patients with Pattern III (n=6). A study with a broader sample involving the three facial patterns may identify differences in the prevalence of premolar extractions during serial extraction.…”

Influência do tamanho das bases ósseas apicais no apinhamento dentário

“…Segundo a autora, foram escolhidos esses pontos por serem os mais exatamente reproduzíveis no sentido ântero-posterior e localizados sobre osso basal próximo dos dentes (RICHARDSON, A., 1966). 828 4,52 86,183 5,36 0,464 5,01 107,63 6,17 0,0089 Da mesma forma que no trabalho anterior, os resultados de Seipel(SEIPEL, 1946) Baccetti et al(BACCETTI et al, 1997) e Bishara et al(BISHARA et al, 1997) OKADA OZAWA, 2008;SATO, 1989;STALEY;STUNTZ;PETERSON, 1985).…”