title: [Rabbit facial nerve damager after Nd: YAG laser irradiation: an experimental study]
abstract: OBJECTIVE:To investigate the change effects of rabbit facial nerve after Nd:YAG laser irradiation.METHODS: According to therapeutic laser energy density,the facial nerves of 28 rabbits were irradiated by Nd:YAG laser with 5 different laser dosages.RESULTS: The facial nerves were functionally intact with mild degeneration histologically at three weeks postoperatively,when the energy density of Nd: YAG laserlaser lower than 70J/cm(2).In the group with energy density of 140J/cm(2),facial nerve density functionally impaired with moderate degeneration which rehabilitated within six weeks. While the laser power increaseed to more than 240J/cm(2),irreversible nerve damages happened.CONCLUSION: laser thermal effect is the main cause of nerve damage,there is a positive correlation between laser dosage and nerve impairment.
authors.affiliation: Department of Oral and Maxillofacial, School of Stomatlolgy, Shanghai Second Medical University. Shanghai 200011, China.
authors.forename: Y C
authors.initials: YC
authors.lastname: Yu
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Zhang
authors.forename: G Y
authors.initials: GY
authors.lastname: Zhou
authors.forename: H G
authors.initials: HG
authors.lastname: Zhu