In Singapore, fractures of the mandible are common and of which, 32% occur at its angle. Current Two-Dimensional (2D) imaging methods are lacking in accuracy, leading to increased surgical morbidity. Aim: To determine the Length (L), Diameter (D), Width (W) and Height (H) measurements in fractured and non-fractured mandibles by using Three-Dimensional (3D) Computed Tomography (CT). Materials and Methods: A single centre retrospective CT based study of 23 subjects (46 mandibular angles and M3s)

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... as conducted and subjects below 16 years, conservatively managed fractures, mandibles without M3s and cases with inadequate CT scan data were excluded. Intraosseous M3 L and D and mandibular H and W were measured and ratios L/H and D/W were calculated. Results: Average mean (Standard Deviation, SD) L, D, H and W was 8.58 (2.089), 11.63 (2.156), 29.17 (4.830) and 16.94 (1.967) mm respectively. Average mean L/H and D/W were 0.30 (0.070) and 0.69 (0.126) respectively. There was a trend towards greater osseous volume occupied horizontally in fractured mandibles. Measurements demonstrated good reliability (CA 0.999-1.000) and good intra and inter-observer variability (ICC 0.998-1.000, p<0.001).