Abstract
Our previous study demonstrated that the occlusal plane generally inclined superiorly toward the mandibular displaced side and that in G3 (19-53 year old group) only, the more the mandibular deviation, the more the incidence of TMJ disorders, This incidence was seen neither in G1 (10-14 year old group) nor in G2 (15-18 year old group).
The purpose of this study was to additionally examine the characteristics of the craniofacial morphology and the relationship between lateral displacement of the mandible and the symptom atic side.
The results obtained were as follows;
(1) In G2 and G3, the more the mandibular deviation, the bigger the difference of the ramus height (Cd-Go) between the mandibular displaced and the non-displaced sides, and the shorter the ramus height of the mandibular displaced side. Interestingly, this incidence was not seen in G1.
(2) The incidence of TMJ disorder symptoms was 39.0% at both sides, 28.0% at the TMJ of mandibular displaced side and 25.4% at the non-displaced side; while the rest (7.6%) could not clearly point out their symptomatic sides.
