Objective The purpose of this study was to identify the cause of inferior alveolar nerve (1AN) damage after surgical removal of impacted lower third molars, and to construct a predictive model to assess the risk of 1AN injury. Methods In 1778 cases of surgical removal of impacted lower third molars ,we gathered preoperative, operative and postoperative data.Then proceed to induce the analysis.Results 0.9% of the extractions caused temporary nerve damage in 1778 cases.The causal factors include;age,the impacted model of the lower third molar,heleeding,and the radiologie relationship between the apices and the mandibular canal. Conclusion Patient age older (OVER 21 ), the more deep of impacted tooth, serious bleeding and the radiologie relationship between thd roots of the third molar and mandibular canal increased the risk of IAN damage.
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