Discussion
pericoronitis, inflammation, transient inferior alveolar nerve injury, inferior alveolar nerve injury, infection
ROOT RESORPTION, PERICORONITIS, IMPACTION, INFLAMMATION, ALVEOLAR BONE RESORPTION, INFECTION, PERIODONTAL DISEASE, CREST
IMTMs in class C and horizontal position are “silent killer”. Due to the deep impaction, the prevalence of pericoronitis or other space infection is relatively lower than other types of impaction, thus it can be hardly noticeable to the patients. Nevertheless, deeply impacted IMTMs may give rise to root resorption, periodontal disease, distal alveolar bone resorption, and other concomitant symptoms of M2s [As the crowns of IMTMs in class C and horizontal position are mostly in close proximity to M2s, the highest resistance for removal of such IMTMs arises from the crowns of M2s [It has been reported in the literatures that transient inferior alveolar nerve injury occurs in 1–5% of all cases of surgical removal IMTM, and 0.1–0.9% of them sustained permanent inferior alveolar nerve injury [Other treatment alternatives, such as coronectomy has been proposed for IMTM with a close relationship with the mandibular canal, to avoid possible damage to the inferior alveolar nerve caused by extraction. Coronectomy is indicated for IMTM without obvious inflammation around the root, the crown and root can be segmented at or below the enamel-cementum junction, and the cross-section is lower than the alveolar crest. The crown can be removed while the root is retained in the mandible [