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Abstract

Background: The atrophy of alveolar ridges after missing teeth extraction requires block procedures based on autogenous tissue for implants to achieve successful outcomes. Practitioners prefer the mandibular ramus to harvest bone grafts because of its excellent quality and minimal side effects yet extraction remains complex because of important anatomical structures in this area. An evaluation of Navident dynamic navigation for ramus block graft extraction accuracy takes place on cadaveric mandibles through this study.
Materials and Methods: The clinical procedure involved block graft harvesting under Navident guidance for eight cadavers during June-September 2024 at Saveetha Dental College. The surgical plans benefited from CBCT scans that enabled titanium screws to perform trace registration. Evaluations through CBCT and Evalunav software measured entry (2D), apex (3D), apex (vertical) and angular deviations regarding basal, mesial and distal saw cuts.
Results: The entry point deviations were minimal as the baseline measurement was 0.24 ± 0.03 mm while mesial was 0.29 ± 0.04 mm and distal was 0.24 ± 0.03 mm. Apex (3D) deviations achieved their maximum value at 0.31 ± 0.04 mm (basal). The mesial orientation showed minimal apex (vertical) deviations of 0.04 ± 0.02 mm while angular deviations reached their peak level at 1.56 ± 0.12° in the same area. The recorded deviations proved to be inside acceptable clinical parameters.
Conclusion: The dynamic navigation system provides enhanced accuracy and safety for ramus block extraction procedures in situations where complex implant procedures require its use. Big sample-based research should follow to verify these observed results