Purpose: To investigate the indication of root retention or removal during impacted mandibular third molar (IMTM) extraction and the relationship between the IMTM root and damage of mandibular alveolar nerve.
Methods: The data of roots from 135 cases performing IMTM extraction were retrospectively analyzed to compare the location relationship between the IMTM and the mandibular canal.
Results: (1)The relationship of 135 cases between the IMTM and the mandibular canal on panoramic radiographs was defined in three types, no contact type in 99 cases of IMTM(73%), point-contact type in 21 cases of IMTM(16%), and superimposition or line-contact type in 15 cases of IMTM(11%); (2)The roots of extracted IMTM were preserved in 18 cases(13%);(3)One month after the extraction of IMTM root, paresthesia in the lower lip disappeared in 17(94%) cases; 1 case had the symptom white resolved 8 months later.
Conclusions: The indication of root retention in the IMTM extraction was as follows: (1)Less than 3mm of residual root; (2)Dental pulp is not infected;(3)The superimposition or line-contact type between the root of IMTM and the mandibular canal.
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