Morphological and Morphometric Evaluation of Mandibular Coronoid Process, Condylar Process and Mandibular Ramus in Jharkhand and Bihar Population

Abstract

Background: Coronoid process of mandible gives attachment to temporalis and masseter muscles. The shape and size of coronoid process varies widely due to influence of many factors. Its shape has been described as triangular, hook shaped and rounded in various studies. Mandibular Condyle, is the part of the mandible that articulates with the temporal bones articular fossa and its appearance is influenced by various factors. The superior border of the mandible's ramus is formed by the mandibular notch and its contour is influenced by shape of the Coronoid process and the Mandibular condyle. Knowledge of these morphological variations is of great help to anthropologists, maxillofacial surgeons and forensic experts. Aim: Aim of present study is the morphological differences in Coronoid process, Condylar process, and Mandibular Notch in adult dry human mandibles in Jharkhand and Bihar. Material and method: 100 dry adult Mandible of known sex from the Department of Anatomy, Phulo-Jhano Medical College Dumka, Jharkhand and other medical colleges of Jharkhand and Bihar were studied. Shape of the coronoid process was visually assessed. Length of the coronoid process and mandibular process were measured by employing standardized method, using digital Vernier calliper. Results: The triangular (120) shape of the coronoid process was the most common among the 200 sides, with 72 (60%) on the right side and 48 (40%) on the left. The second was beak-shaped (68), with 36 (52.9 percent) on the right side and 32 (47 percent) on the left side, followed by the round shape (12), of which 7 (58.4%) were on the right side and 5 (41.6%) on the left side. Mean length of right and left side of coronoid process among male was 17.79 ±0.88 mm and 17.51±0.83mm respectively, while in females these measurements were 16.59±0.97mm and 16.33±0.68 mm respectively. Mean length of right and left side of mandibular condyle among male was 12.9 ± 2.13mm and 10.88±2.01mm respectively, while in females this value was 11.8± 1.67mm and 11.21± 1.75mm respectively. Average distance from the head of the mandible to the base of the mandible on right and left sides were64.22±5.77 mm and 64.05 ± 5.92 mm respectively. Similarly values for distance from the base of the mandible to mandibular notch were 46.32±7.21mm and46.24±8.49mm respectively and values for distance from the anterior border to the posterior border of the ramus of mandible were 30.48 ± 2.36mmand 30.31±2.32mm on right and left side respectively. Conclusion: Triangular shape of coronoid process was most common type seen in Jharkhand and Bihar population. This finding is similar to many other such studies. There was statistically significant difference between length of coronoid process and mandibular condyle of male and female. All these findings are of immense importance to anthropologists, maxillofacial reconstructive surgeons and forensic experts. Keywords: Morphology, Morphometry, Coronoid, Condyloid, sigmoid notch, Mandible.