【摘要】 目的 通过对后牙邻面龋的窝洞预备用不同的方式，观察其临床效果，寻找更科学的预备技术。方法 收集后牙邻面中龋未累及边缘嵴的患牙221颗，随机分为实验组和对照组。实验组用隧道式或狭槽式预备窝洞，对照组用传统的方式去除边缘嵴达邻面，合面扩展形成鸠尾固位，用同一种修复材料充填修复。观察2年，从边缘密合性、牙髓反应、继发龋、脱落率方面评价疗效。结果 隧道式和狭槽式预备较传统式预备在修复体边缘密合性和脱落率方面经统计学检验，差异有显著性(P<0.05)，但是在继发龋方面，隧道式和传统式两组差异无显著性(P>0.05)。结论 狭槽式预备方式比传统式有明显优势，当龋损位于邻面中部时可以取代传统式。而隧道式预备方式不理想。

    【关键词】 后牙邻面龋；窝洞预备

    Clinical study on cavity preparations of caries situated proximal surface of molar

    HE Ai-min. Hefei Stomatological Hospital. Hefei 230001,Anhui Province, China

    【Abstract】 Objective To explore newer techniques for removal of carious dentine in proximal surface of molar. Methods 221 teeth suffered from caries situated proximal surface of molar randomly were treated either tunnel preparation and slot preparation or dovetail retentive cavity.The same restorative material was used 2 groups. After two years of followup. The clinical effects were recorded and evaluated. Results There was significant difference in two groups(P<0.05) in respects to loss of retention, margin sealing. But there was no significant difference in two groups (P>0.05) in respect of secondary caries. Conclusion The slot preparation may replace dovetail retentive cavity when caries is situated middle part of proximal surface. The tunnel preparation is not satifactory. ......