Avaliação de superfície da cerâmica odontológica reforçada por dissilicato de lítio após diferentes protocolos de polimento

Abstract

Dental ceramics are materials that can meet the aesthetic demands of today's society, mainly because they reproduce the beauty and naturalness of teeth. Among the most commonly used are those modified by lithium disilicate. In these there is often the need for occlusal adjustment, which generates a highly rough surface. The present study had the objective of evaluate, in a laboratory environment, the influence of different polishing protocols on ceramics for dental use reinforced by lithium disilicate. A laboratory study was carried out, with inductive approach, statistical and comparative procedure, with direct laboratory documentation technique. The samples were made from the Dental Ceramics IPS e.max Press. Twenty-one ceramic specimens had their surfaces planned and glazed. These specimens were divided into 3 groups (n = 7), where each group had a different surface treatment. After that, an initial analysis of its surface roughness was made with a profilometer. After initial analyzes, the groups received the following surface treatments: G I - Ceramics after simulation of the occlusal adjustment with the diamond tip 4219F; G II- Ceramics after finishing and polishing with Kit Exa-Cerapol (kit 1); G III- Ceramics after finishing and polishing with Kit Pk6 Dh-pro (kit 2) . After surface treatment, the values of roughness was analyzed again. The surface roughness values obtained were statistically analyzed using Kruskal Wallis, Mann Whitney and Wilcoxon test (p <0.05). After analysis, it was observed that only Group I at the beginning had a statistically significant difference of roughness of the other groups (p=0,002). In the final analysis, all groups presented statistically significant differences, among themselves (p<0,001), and between the initial and final values within the same group (p= 0,018). Group I had the highest average roughness, while Group II had the lowest average. It was concluded that the ceramic increase its roughness after every treatment and none of the groups was able to reestablish the roughness produced by the glaze.