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Updated: Sep 18, 2025
A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
Estimation of the Safe Zone in the Anterior Mandible for Implant Osteotomy: A Cone-Beam Computed Tomography (CBCT)
Mousumi Mahato1, Sadananda Hota2, Purnendu Bhusan2
1Prosthodontics, Kalinga Institute of Medical Sciences, Kalinga Institute of Industrial Technology Deemed to be University (KIIT DU), Bhubaneswar, IND.
Purpose:
This study aimed to estimate the safe zone in the anterior mandible relative to the genial tubercle. It also evaluated the genial tubercle's reliability as a reference point for interforaminal measurements during implant planning.
Patients And Methods:
Four hundred ninety-nine cone-beam computed tomography (CBCT) Digital Imaging and Communications in Medicine (DICOM) files (250 men and 249 women) were examined with NNTViewer software (Newtom, Verona, Italy). These files were obtained from dental departments of academic institutions and private imaging centers. The distance from the genial tubercle to the anterior loop of the inferior alveolar nerve was measured, and a standardized protocol for determining safe zones was established.
Results:
In men, the mean safe zone was 23.14 mm (right) and 22.07 mm (left). In women, it was 20.82 mm (right) and 19.47 mm (left). Overall, men showed wider safe zones, with more women falling within the 15-19.9 mm category, while more men had >25 mm safe zones. Linear regression indicated a strong correlation between the genial tubercle to anterior loop distance and the safe zone.
Conclusion:
This study provides valuable data on anterior mandibular safe zones, highlighting gender-based differences and supporting safer implant osteotomy planning using the genial tubercle as a reference.
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