Lower incisor angulation differences in Class II division 1 malocclusions with and without full 'lip trap'.
A cephalometric study was designed to investigate whether a difference in lower incisor angulation exists in Class II division 1 malocclusion subjects with and without the presence of a lower lip trap. Chinese subjects (N = 40) with Class II division 1 malocclusions who demonstrated a complete lower lip trap were compared to an equal number of subjects with a partial lip trap. Intergroup comparisons of several cephalometric parameters indicated the presence of statistically significant differences in both the degree of lowe incisor proclination/retroclination (p < 0.01) and the magnitude of the overjet (p < 0.05). In the complete lip trap group, the lower incisor was more retroclined and the overjets were also statistically larger than the partial lip trap group.
Lew
K K
KK
National University of Singapore.
D000328:Adult; D002681:China / Q000208:ethnology; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology* / Q000503:physiopathology; D008046:Lip / Q000503:physiopathology*; D008297:Male; D008312:Malocclusion, Angle Class II / Q000503:physiopathology*; D008334:Mandible; D012846:Singapore