Objective: To evaluate the diagnostic efficacy of the bitewing radiograph(BWR),clinic examination(CE) and laser fluorescence examination (LF) for detection of initial posterior approximal caries . 体外评价比较平行投照的牙合翼片(BWR)、激光荧光法(LF)和模拟临床检查(CE)等3种诊断方法对早期邻面龋的诊断水平。