金属烤瓷冠引起龈缘着色的原因与处理

目的 对28例金属基底烤瓷冠引起冠颈部龈缘着色进行分析，探讨如何解决或改其着色现象。方法 选取28例配载金属基底烤瓷冠（桥）出现牙龈着色的病人，修复时间最短2周，最长3年，拆除原金属基底烤瓷冠，临时塑料冠修复，观察2周后，再行颈瓷技术或重新牙备后再行金属基底烤瓷冠修复。结果 通过一定时间的观察发现，用颈瓷技术的烤瓷冠，牙龈着然现象消失。而用非颈瓷技术的烤瓷冠，牙龈着色现象有了很大改善。结论 金属基底烤瓷冠引起的冠颈部牙龈着色现象，可以通过颈瓷技术或对基牙重新制备的方法，使其消除或显著改善。

Causes and Management of Gingival Coloration Caused by Metal Ceramic Crows

Objective To analyse the marginal gingival coloration caused by metal based ceramic crowns in 28 patients,and to explore the methods to remove or reduce this abnormal coloration.Methods 28 patients with metal based ceramic crowns developed gingival coforation.The period of wearing crowns ranged from 2 weeks to 3 years.To remove or reduce gingival coloration,the original metal based ceramic crowns were discarded.Temporary plastic crowns were utilized for 2 weeks.The cervical ceramic approach was used for rehabilitation,or the abutments were re-prepared for metal based ceramic crowns. Results At the end of follow up,gingival coloration disappeared in patients managed with cervical ceramic approach.While in patients managed with second metal crowns, gingival coloration was improved greatly. Conclusions Gingiral coloration can be removed or reduced by cervical ceramic approach or re-fabrication of metal based ceramic crowns.