带翼桩冠在上前牙龈下残根残冠修复中的运用

目的：介绍一种上前牙冠折位于龈下〉3mm的桩冠修复方法，探讨化于龈下的上前牙残根、残冠修复中的难点，分析铸造桩核加带翼金属烤瓷冠进行修复的原理。方法：对23例（26个牙）上前牙根面位于超过龈下〉3mm左右的残根、残冠．经根管治疗后，采用铸造桩核加两侧邻牙带翼金属烤瓷熔附金属冠修复。结果：经3个月至5年的临床观察，修复冠稳固，固位和抗力效果良好．结论：根面化下超过龈下3mm或冠根斜折的上前牙残根、残冠可完全保留，进行带翼桩冠修复。外观和咀嚼功能恢复良好。

The application of the post crowns with wings to the restoration of the subgingival residual roots and residual crowns of anterior maxillary teeth

Objective:To presents a new way of constructing post crowns for the anterior maxillary teeth which had the subginginval crown fracture more than 3 mm.To discusse the difficulties in the restoration of the subgingival residual roots and residual crowns of anterior maxillary teeth,and to explore the principles of the new restoration by the casting post-core and the porcelain fused mental crowns with wings. Methods: 23 patients(26 teeth) which had crown fracture more than 3 mm under the gingival were enrolled in this study.After those residual roots and crowns were endodontically treated following the conventional root canal therapy,the casting post-core and the porcelain fused mental crowns with wings were applied to reconstructing those missing crowns. Results: After 3 months to 5 years clinic observation,restored crowns were still stable with good retention and fracture resistance. Conclusion: Those residual roots and crowns can be preserved by this innovative way and can also acquire satisfactory effects in esthetics and functions.