目的比较后牙邻面龋保守性预备与传统预备的疗效。方法选择后牙邻面龋未波及牙颌面的患者比例,随机选择50例进行保守性窝洞预备后用银汞合金充填作为观察组;另外50例按Black经典窝洞预备方式预备后用银汞合金充填作为对照组,比较两组治疗5年后的疗效。结果观察组充填物折裂松脱例数与对照组相同,差异无统计学意义(P>0.05)。结论保守性预备比传统预备对牙体硬组织破坏少,且银汞合金充填二者固位性抗力性无差异,更值得推广。 Objective To compare the efficacy of conservative and traditional preparation of the posterior teeth caries. Methods The proportion of patients whose posterior facet caries did not affect the dento-maxillofacial region was selected. Fifty cases were randomly selected for conservative nest filling and then filled with amalgam as the observation group. The other 50 cases were prepared according to the Black Classic hole preparation method. Amalgam filling as a control group, compared the efficacy of two groups after 5 years of treatment. Results The number of fracture loosening in the observation group was the same as that in the control group, with no significant difference (P> 0.05). Conclusion Conservative preparation has less damage to tooth hard tissue than conventional preparation, and there is no difference in retentive resistance of both amalgam filling and deserving to be popularized.