RESUMO
Introduction: Cone beam computed tomography (CBCT) is often used in pre-implant planning where it helps assessing theamount of bone availability and its relationship from its surrounding structures. In certain vital areas such as inferior alveolarnerve canal and submandibular gland fossa, it is important to know the dimensions of the bone to avoid post-operativecomplications. The aim of the study was to evaluate the deepest area or the concavity depth submandibular fossa on CBCTand also to measure/determine the distance from the mental foramen to the deepest concavity depth and the height of alveolarcrest from the deepest concavity depth.Materials and Methods: Retrospective studies of CBCT images were obtained on a KODAK 9000 three-dimensional (3D)extraoral imaging systems using CS 3D imaging software. The site of the submandibular gland fossa was identified, andmeasurements were done to evaluate the depth of the fossa, its distance from the alveolar crest and from the mental foramen.Results: The lingual concavity depth over a range up to a maximum value of 3.70 mm and the minimum depth up to 0.5 mm.Analysis of variance compared the mean values and standard deviation for mandibular measurements between male and female.The sexes did not differ significantly. Independent sample t-test did not demonstrate any difference among the age group,#P > 0.05.Conclusion: CBCT is an important tool for assessing the mandibular region and planning for safe implant placement in theposterior mandible.