Objective: To study the influence of telescope crown and precision attachment retainer to the abutment periodontium.

• 目的: 探讨套筒冠和精密附着体固位体对基牙牙周组织及牙周四类细菌生长的影响,为套筒冠和精密附着体固位体的临床应用提供理论基础。