Assessment of Inferior Alveolar Nerve Position at the Region of First and Second Mandibular Molars in Dentate and Edentulous Sites Using Cone Beam Computed Tomography: A Cross-Sectional Study.

Determining the position of the Inferior alveolar nerve (IAN) is an important factor prior to any surgical procedure in the mandible such as dental implant insertion and surgical tooth extraction. The aim of this study was to compare the position of IAN in partially edentulous patients in the lower first and second molars in both missing and dentate sides. A total of 200 CBCT scans were chosen randomly and examined. On cross-sectional views, the distance between lower border of IAN canal and upper border of inferior cortex of mandible (IC) were measured at the site of dentate and edentulous mandibular first and second molar. Paired-sample t-test was used to analyze and compare measurements on right and left sides. A total of 100 males and 100 females with mean age of 46.05 +/- 12.33 years were included. The IC distance measured in four pairs were as follows: Pair one: 80 cases with right missing 6 (mean +/- SD = 3.73 +/- 1.29 mm) and left present 6 (mean +/- SD = 3.42 +/- 1.20 mm), Pair two: 20 cases with right present 6 (mean = 3.20 +/- 1.48 mm) and left missing 6 (mean +/- SD = 3.96 +/- 1.62 mm), Pair three: 54 cases of right missing 7 (mean +/- SD = 3.83 +/- 1.74 mm) and left present 7 (mean +/- SD = 3.62 +/- 1.74 mm), and Pair four: 46 case of right present 7 (mean +/- SD = 3.49 +/- 1.56 mm) and left missing 7 (mean +/- SD = 3.84 +/- 1.42). The IAN was statistically more distant from inferior cortex of mandible in the edentulous parts compared with the non-edentulous part (P < 0.05). The IAN was positioned farther from the inferior cortex of mandible in edentulous sites compared with dentate parts. Cautious consideration is essential in any surgical procedure and dental implant operations to prevent IAN injury.