Pre –treatment implant CBCT Analysis of Anterior Mental Loop Length, Lingual Concavity and Inclination of Alveolar Ridge in the Mandible – A UAE Study

Abstract

Aims: This study aims to use 3D imaging (CBCT) in order to identify the presence of anterior mental loop,
know its dimensions and variation in anatomy, lingual concavity and the angle of tilt in the mandibular ridge
aiding in better treatment planning for surgical approaches.
Method: Forty CBCT images of patients scanned by Planmeca Romexis for different diagnostic purposes,
were analyzed using the Romexis software.
Results: The study results showed that mental loop was present in 62.5% of patients on the right side and 70%
of patients on the left side, with a mean length ranging from 0.30 mm to 3.12 mm. The presence of anterior
canal was observed in 5 patients (2 Females and 3 Males) 12.5% of the cases examined. As mentioned in
methodology lingual concavity was classified based on its morphology into three classifications: A (Acute
undercut) B (stream line) C (Kidney shape), with class C (Kidney shape) amounting up to 42.5% of the cases
while the least common was class B (stream line). In 40% of the cases, deepest lingual concavity was in the
region of the second molar.
Conclusions: Placement of implants in the molar region of the mandible may result in perforation of the
lingual cortex due to severely inclined ridge or deep lingual concavity. Presence of mental loop and anterior
mandibular canal in the region of mandibular region needs careful evaluation using different tomographic
slices.