POSTULATION OF THE POSITION OF TRANSVERSE AXIS OF TEMPOROMANDIBULAR JOINT FROM CONDYLAR AND GONIAL DISPLACEMENTS
Journal Title: Journal of Evolution of Medical and Dental Sciences - Year 2017, Vol 6, Issue 37
Abstract
BACKGROUND The position of axis of temporomandibular joint on the ramus of mandible is controversial as reported earlier by many authors, but important for its necessity in clinical application, i.e. planting of mandibular prosthesis. Customarily, this hinge axis is presumed to be placed at the base of the lingular or lower attachment of sphenomandibular ligament, as it becomes taut when mouth is fully opened. As regard to the closing and opening of jaw, the mandible rotates around two hinge axes. The terminal hinge axis passing through the condyles mediolaterally and transverse axis passing at some point through the ramus. MATERIALS AND METHODS The present study was conducted on 1200 subjects (600 males and 600 females) of three states (Haryana, Himachal Pradesh and Odisha) belong to the age group of 18 - 25 years. Two parameters condylar protrusion or displacement (Cy. Disp.) and gonial retrusion or displacement (Go. Disp.) were selected including Condylar Gonion Displacement Index (CGDI) derived from two anthropometric measurements Nasion Condylon (Na-Cy) and Nasion Gonion (Na-Go) with the mouth closed and wide open by using sliding caliper. RESULTS The mean condylar displacement (Cy. Disp.) and gonial displacement (Go. Disp.) on total population being 7.41 mm and 16.77 mm respectively and the Condylon Gonion Displacement Index (CGDI) was 49.89. CONCLUSION As the Go. Disp. is approximately twice of the Cy. Disp. and the mean CGDI 49.89, the transverse axis on the ramus is being postulated to be present on the ramus nearer at the junction between upper one-fourth and lower three-fourth in an average.
Authors and Affiliations
Sidharth Sankar Maharana, Gopichand V. V Patnaik, Purna Chandra Maharana
Keywords
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- EP ID EP211033
- DOI 10.14260/Jemds/2017/653
- Views 71
- Downloads 0
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