Anterior buccal mandibular depression: A descriptive CT study of radiographic features
Al-Sadhan, Ra'ed . 2021
Objective: We aimed to describe the radiographic features of anterior buccal mandibular depressions (ABMDs) on CT and cone beam CT to report their concurrence with anterior lingual mandibular depressions (ALMDs). The effect of ABMDs and ALMDs on dental implant sites was also assessed. Methods: A retrospective review of CT scans of mandibles with ABMDs was conducted to assess the morphology, site, presence of foramina, ALMDs, and integrity of the cortical plate. The superoinferior width of ABMD was measured as well as the buccolingual depth, and mesiodistal length then it compared the thickness of the cortical plate at the depression to the area superior to it. The buccolingual dimensions of mandible perpendicular to the long axis of the canine in the ABMD cases were compared with measurements made on a control group of matching age and sex. Results: Thirty-seven patients with 74 ABMDs were included. All observed ABMDs occurred bilaterally, and ALMDs with ABMDs occurred in 13 sites (17.56%). In 20 cases (54%), at least one foramen was noted. The buccal cortical bone was intact in all cases. The contents of ABMDs were fatty. On average, their superoinferior width was 7.1 mm (range 3.4-11.7 mm), buccolingual depth 1.67 mm (range 0.8-4.5 mm), and mesiodistal length 18.8 mm (range 15.2-23.8 mm). The average buccal cortical bone plate thickness at the ABMD was 1.23 mm (rang 0.4-1.9 mm), while the average buccal cortical bone plate thickness coronal to the ABMD was 1.34 mm (range 0.7-2.2 mm). The average buccolingual dimension of the mandible was 8.72 mm (range 4.15-13.4 mm) at ABMD sites without ALMD and 4.6 mm with ALMD (range 1.8-8 mm). Conclusion: When ALMD occurs together with ABMD, the amount of bone available for implant placement is greatly reduced.
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