1.Objective: to explore the prosthetic design and procedure of residual crown with complete root canal imperforation so as to solve the clinical problem of such cases.
目的：探讨根管完全闭锁钙化残冠、残根的临床修复设计与方法，为修复临床对这类病例提供解决方案。
2.Objective: to explore the prosthetic design and procedure of residual crown with complete root canal imperforation so as to solve the clinical problem of such cases.
