Abstract
The purpose of this study was to investigate soft tissue
adaptability to hard tissue; in other words, to evaluate the relation
between the inclination of upper and lower anterior teeth
with the upper and lower lips, and how this relation affect
the soft tissue profile in Class II division 1 malocclusion subject
for both genders (males and females).
The sample of this study comprised lateral cephalograms
from 40 Class II division 1 malocclusion subjects (20 males
and 20 females) aged 18–25 years. Two dental [upper and lower
incisor inclination {the angle formed between the long
axis of the upper central incisor (U1) and the palatal plane
(PP) and the angle formed between the long axis of the lower
central incisor (L1) and the mandibular plane (MP)}] and three
soft tissue [nasolabial (nla), labiomental (lma) and soft tissue
facial convexity (n–sn–pog)] angular measurements were
analyzed. The results showed no significant difference between
males and females concerning the proclination of upper
anterior teeth and the prominency of upper lip, while the females
exhibited more proclined lower anterior teeth and more
protrusive lower lip than males. The males tend to have more
convex facial profile than females