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.
Conclusion: Gingiral coloration can be removed or reduced by cervical ceramic approach or re-fabrication of metal based ceramic crowns.