抄録
Histopathological investigation on mandibular nerve injury caused by deep insertion of dental implants into dog mandibles, at one month post-implantation of polycapillary implants. Two implants with mandibular nerve injury were accidentally observed in histological specimens of the sixteen implants.
Case I showed axonotmesis caused by continuous pressure to the mandibular nerve and several traumatic neuromas, induced by repetitious mastication impact stress, were observed around the axonotmesis. Case II showed neurotmesis caused by mis-drilling with channel former bar,and an active recovery was observed around the residual nerve fibers.
From these histopathological investigations, it was obvious that continuous or repetitious compressive and/or tensile stress to the mandibular nerve may induce traumatic neuroma even under light mastication stress, which causes pain and paralysis. It is suggested that the implant with pain and/or paralysis should be removed or raised slightly as fast as possible.
