Craniofacial morphology is the study of dynamic relationships among various craniofacial skeletal components, which is influenced by both intrinsic as well as extrinsic factors. Internal derangements alter the dynamic growth within this region resulting in a loss of facial growth equilibrium expressed in the various adaptive growth sites (Nebbe et al. 1997)
The term bird face deformity was coined by Obwegser and Hadjianghelou (1987) to describe a clinical state of micrognathic mandible with receding chin and steep occulusal plane. Examination of three hundred adult human skeletons obtained from the collection of Department of Anatomy, K.G’s Medical College, Lucknow revealed one interesting case of bilateral temporomandibular joint (TMJ) ankylosis. The capsule and lateral towards left side. Complete anadontia of incisors was observed. Craniometric points of condylion to gonion i.e., ramus heights of both the sides were much reduced (3.5 cms) as compared with the normal (4.5 cms). The mandibular corpus length of right side was 7.3 cms, whereas the left was 4.7 cms. Gonion angles were increased, right and left both angles exhibited remarkable difference 134o and 128o. Mandibular plane angles were 45oand 47o of left and right respectively. Pantomogram of skull revealed differences in dental arches of maxilla and mandible.
CT-scan indicated more severe derangement of the right temporomandibular joint, an evidence in favour of the primary involvement of the right side followed by the immobilization of the opposite temporomandibular joint.
Department of Anatomy, and Periodontia, K.G’s Medical College, Lucknow.