Korean J Orthod.  1984 Mar;14(1):103-113.

A cephalometric study of soft tissue profile changes associated with orthodontic treatment

• Park YG
• Lee KS

Abstract

This work was undertaken to evaluate the integumental response in lower face to hard tissue changes, and to grope the prediction for expected integumental profile changes. Cephalometric headplates of 25 persons consisted of 8 Angle's class 1 maxillary protrusive and 17 Angle 's class II division 1 patients whose mean age was 15.2 years were traced, diagramatized, and statistically analyzed. The results were as follows; 1. Upper incisor and lips were retracted and convexity of integumental profile decreased concurrently with decrease of hard tissue procumbency, however soft tissue point A', B', and Pog' did not undergo significant changes after orthodontic treatment. 2. Remarkable increment of upper lip thickness and upper lip height was shown and this was related to upper incisor retraction. The ratio between the amount of upper incisor retraction and the increment of upper lip thickness was approximately 1.16 : 1. 3. Moderate correlation of upper lip retraction to upper incisor retraction, and of lower lip retraction to lower incisor movement were arranged, and yet comparatively wide variability from subject to subject was shown. 4. It was possible to predict statistically for horizontal of lip position and change of upper lip angulation ground in orthodontic treatment.

MeSH Terms

Humans
Incisor
Lip