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ISSN 2063-5346
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RADIOGRAPHIC ESTIMATION OF MENTAL NERVE LOOP POSITIONING - A PILOT STUDY

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Ramya.G, Dhanaraj Ganapathy , Kiran Kumar Pandurangan, Nabeel Ahmed, Subhabrata Maiti
» doi: 10.31838/ecb/2023.12.s2.184

Abstract

Introduction : Modern dentistry has changed tremendously with implant therapy. For successful implant therapy, making a proper treatment plan considering both surgical and prosthetic parts is the key to success. The anterior loop is described as the mental canal which rises from the mandibular canal and runs outward, upward and backward to open at the mental foramen. During surgery, surgeons usually expose the mental foramen to visualize the position of the mental nerve. However, without knowing the anterior loop length, surgeons have a high risk of violating the anterior loop. Aim: The aim of this study was to assess the prevalence of anterior loop of mental nerve by using CBCTs, comparing the right and left side mental foramen, assessing the diameter of foramen and checking if there is any association between anterior looping and age or gender significantly. Materials and Methods : The CBCT’s of 33 patients who required an implant in the lower arch were assessed to check the presence or absence of looping of the mental nerve. The dimensions of the mental foramen was compared on the right and left side based on its shape, size, extent with relation to mandibular 2nd premolar and lower border of mandible. Galileos implant viewer software was used in measuring the parameters and CATVVision software was used for nerve tracing, mental loop assessment and visualisation. The results were tabulated and interpreted using SPSS software (version 23). Chi-square test was performed to evaluate the association of the various parameters. Results: From the results, it was observed that the prevalence of anterior looping of the mental nerve in this study was 10%. It was found that looping in the left side predominantly and the study shows a female predilection of 63%. On Chi-square analysis the position of the mental foramen from the lower border of the mandible was found to be statistically significant (p<0.05). However no significant difference was observed with respect to mental nerve looping on the basis of gender or side of loop being present. Previous studies have also cited that no statistically significant difference was observed between right and left sides or between different gender groups. Conclusion: When placing implants in close proximity to mental foramina, caution is recommended to avoid injury to the mental nerve and its neurovascular bundle. Therefore, the precise location of the mental loop must be identified using proper radiographic techniques before surgery.

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