IADR Abstract Archives
Anatomical relationship between mandibular third molars and the inferior alveolar nerve
Objectives: To determine the anatomical relation of mandibular third molars in relation to the IAC, in Cone Beam Computed Tomography of the Imaging Service of the Viña del Mar Dental Polyclinic of the Chilean Navy.
Methods: An observational, descriptive cross-sectional study was conducted, where 65 CBCTs were evaluated, in which 105 third molars from patients who attended in 2017 to the Imaging Service of the Dental Polylinic of Viña Del Mar, Dental Center, First Naval Zone, Chilean navy. The non-individualized analyzes of the CBCT were classified according to age, sex, number of roots and position of the IAC with respect to the apex closest to the third molar, with the classification described by Wang, finally measuring the distance in millimeters between these structures.
Results: The most frequent relation was an apical position of the IAC with 74%, followed by an 18% in its lingual relation and an 8% in its vestibular relation. As for its route, 100% of the analyzed conducts did it in a periradicular way. 53 cases (50.5%) were in contact with the CDI, while 52 cases (49.5%) were not in contact. In both vestibular and lingual positions, 77.7% of cases are in contact with the IAC. Non-contacting cases presented a distance of 3.06mm on average.
Conclusions: The study does not present significant differences regarding the relationship between third molars comparing the available literature. However, emphasis must be placed on correct imaging diagnosis by the clinician and the use of pre-surgical CBCT to evaluate cases in which a panoramic (two-dimensional) radiograph can provide less support in the planning since an overprojected IAC at the roots would indicate high percentage of contact, according to CBCT.
Methods: An observational, descriptive cross-sectional study was conducted, where 65 CBCTs were evaluated, in which 105 third molars from patients who attended in 2017 to the Imaging Service of the Dental Polylinic of Viña Del Mar, Dental Center, First Naval Zone, Chilean navy. The non-individualized analyzes of the CBCT were classified according to age, sex, number of roots and position of the IAC with respect to the apex closest to the third molar, with the classification described by Wang, finally measuring the distance in millimeters between these structures.
Results: The most frequent relation was an apical position of the IAC with 74%, followed by an 18% in its lingual relation and an 8% in its vestibular relation. As for its route, 100% of the analyzed conducts did it in a periradicular way. 53 cases (50.5%) were in contact with the CDI, while 52 cases (49.5%) were not in contact. In both vestibular and lingual positions, 77.7% of cases are in contact with the IAC. Non-contacting cases presented a distance of 3.06mm on average.
Conclusions: The study does not present significant differences regarding the relationship between third molars comparing the available literature. However, emphasis must be placed on correct imaging diagnosis by the clinician and the use of pre-surgical CBCT to evaluate cases in which a panoramic (two-dimensional) radiograph can provide less support in the planning since an overprojected IAC at the roots would indicate high percentage of contact, according to CBCT.
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