An assessment of color effect on minimal and no-preparation veneers / 实用口腔医学杂志

ABSTRACT

Objective: To evaluate the color effect of esthetic rehabilitation of anterior teeth restored with the minimal and no-preparation veneers and to analyze the influence factors of satisfaction. Methods: 30 patients were divided into group A (9 patients with tetracycline discoloured teeth treated with 72 veneers) and group B (21 patients with non-tetracycline teeth treated with 66 veneers) . All the selected teeth were restored with the minimal and non-preparation veneers. Before the teeth were prepared and after veneers were cemented, Olympus Crystaleye was employed to obtain L*, a*, b*values of each tooth. The shade was selected according to the patients' expectation and dentist's advice. The color difference (ΔE) before and after restoration of group A and group B, the color difference (ΔE1) between the tooth color after restoration and the expectation color of the patients, the relationship of the satisfaction degree and the color difference (ΔE1), the lightness difference (ΔL*), Δa*and Δb*were analyzed by SPSS 20. 0. Results: After cemented, the color of teeth-veneer-complex obviously improved in both groups. The color difference (ΔE1) between the tooth color before and after restoration, and the expected color between the 2 group was significant (P ＜ 0. 05) . ΔE1, ΔL*, Δa*had great influence on the satisfaction of dentists and patients (P ＜ 0. 05) . Conclusion: The appearance of non-tetracycline teeth restored with the minimal and no-preparation veneers was excellent. The more of the color of the teeth-veneer-complex matched the expectation color, the higher the patients are satisfied with the restorations. The less of the lightness difference, the higher the patients are satisfied with the restorations.