Arunee Tiptawonnugul. Intermaxillary tooth size discrepancies among Class I, II, III occlusion in a group of Thai . Master's Degree(Orthodontics). Mahidol University. : Mahidol University, 2004.
Intermaxillary tooth size discrepancies among Class I, II, III occlusion in a group of Thai
Abstract:
The purpose of this study was to determine whether there was a prevalent
tendency for intermaxillary tooth size discrepancies among different malocclusion
groups and genders in a group of Thai people. The samples consisted of 360
pretreatment orthodontic models with Class I, Class II and Class III malocclusions.
Tooth size measurements were performed on these models by electronic digital
calipers to an accuracy of 0.01 mm. Tooth size ratios were analyzed as described by
Bolton. The incidence of mesio-distal tooth size discrepancies in the malocclusion
groups was analyzed and compared between males and females. The ratios from this
study were compared with the ratios from various studies, principally, Bolton’s study.
The results of the study showed no significant sexual dimorphism for the tooth
size discrepancies in each of three malocclusion groups. Further, ANOVA indicated
that, no significant difference was determined in the anterior ratio but there were
significant differences between Class II and both Class I, III malocclusion groups for
posterior and overall ratios. When the anterior and overall ratios of the present study
were compared to that of Bolton’s, no significant difference was found in all
malocclusion classes, except for the anterior ratio in Class III malocclusion.
This study suggests that the differences in intermaxillary tooth size discrepancy
among the three malocclusion groups should be considered during orthodontic
diagnosis and therapy.