Sanmartí-Garcia Gemma, Valmaseda-Castellón Eduard, Gay-Escoda Cosme
Department of Oral Surgery and Implantology, School of Dentistry, University of Barcelona, Barcelona, Spain.
J Oral Maxillofac Surg. 2012 Jan;70(1):5-11. doi: 10.1016/j.joms.2011.03.030. Epub 2011 Jul 27.
To verify the utility of computed tomography (CT) in preventing inferior alveolar nerve (IAN) injury owing to lower third molar extraction in close relation to the IAN on orthopantomogram.
A retrospective cohort study design of 150 lower third molar extractions was performed. Patients were divided in 2 groups: the CT group (n = 95) underwent panoramic radiography and mandibular CT and the control group (n = 55) underwent only panoramic radiography.
Six extractions (4%) in the control group and 15 (10%) in the CT group resulted in IAN impairment (P > .05). Logistic regression models did not show that undergoing CT decreased the risk of IAN injury from lower third molar extraction.
Patient age and positive radiographic signs (darkening of the root and narrowing of the inferior alveolar canal) were associated with more requests for CT scanning. CT does not seem to significantly decrease the risk of producing IAN injury.
验证计算机断层扫描（CT）在预防因在下颌全景片上与下牙槽神经（IAN）关系密切的下颌第三磨牙拔除导致IAN损伤方面的效用。
对150例下颌第三磨牙拔除病例进行回顾性队列研究设计。患者分为两组：CT组（n = 95）接受全景片和下颌CT检查，对照组（n = 55）仅接受全景片检查。
对照组6例（4%）拔牙、CT组15例（10%）拔牙导致IAN损伤（P >.05）。逻辑回归模型未显示接受CT检查可降低下颌第三磨牙拔除导致IAN损伤的风险。
患者年龄和影像学阳性体征（牙根变黑和下牙槽神经管变窄）与更多的CT扫描需求相关。CT似乎并未显著降低发生IAN损伤的风险。
