Influência de cinco diferentes protocolos de polimento na superfície da zircônia monolítica multicamadas avaliando suas características ópticas - translucidez, contraste e opalescência

Abstract

Polishing protocols aim to create a smooth, shiny surface with optical properties similar to natural enamel. The objective of this work was to analyze the influence of five different polishing protocols on the translucency, contrast and opalescence of multilayer zirconia. Two different brands of zirconia were analyzed: Amanngirrbach Zolid FX Multilayer and GoldF ML Multilayer, divided into five groups with ten samples in each group (n=10), identified as “Group DA” (EVE Diacera - wheel with diamond particles), “PA Group” Diamond Paste Polishing Paste with Aluminum Oxide), “PD Group” (Diamond Excel Polishing Paste with diamond grain), “EX Group” (Exa-Cerapol – KIT with three steps) and “GL Group ( Glaze Paste Insync)”. Each group was analyzed using an EasyShade Advance 4.0 spectrophotometer before and after the polishing protocol and the parameters of translucency (TP), contrast (CR) and opalescence (OP) were evaluated. Data were analyzed by ANOVA and Kruskal-Wallis and statistical significance was set at p<0.05. The values obtained for TP varied between 0.68-2.32 for the Amanngirrbach samples, being more significant and between 0.68-5.14 for the GoldF group samples. For CR they assumed a variance of 0.98-1.00 for both groups. For OP they varied between 0.25-2.24 for Amanngirrbach and between 0.45-2.27 for the GoldF group. The values measured for the differences between the After-Before means of the parameters for Amanngirrbach comparing the groups and the sample thirds reveal that TP differences were identified in the middle and incisal thirds, where the PD and EX polishing protocols differed between the thirds and middle and incisal. For CR, for the most part, they were not significant (p>0.05), differing only between the DA and PD groups, for the incisal third and for OP they showed differences in the cervical third between the PA and GL groups and in the incisal third , between the PD and EX groups. The GoldF values comparing the groups and sample thirds reveal that PT differences were identified in the cervical, middle and incisal thirds between the GL protocol and the others. For CR, in the middle and incisal thirds, there was a difference between the GL protocol and the others and in the cervical third, there were differences between DA, EX and GL. For OP, in the middle and incisal thirds, no differences were observed between the protocols and in the cervical third, the PA protocol differed from DA and EX. It is concluded that the multilayer zirconia from the different manufacturers tested showed different translucency and opalescence characteristics, which may suffer different influences according to the polishing protocol used. There is a prevalence of increased translucency after the different polishing protocols applied. Contrast behaved consistently in all groups analyzed, regardless of the polishing protocol used. Opalescence in the middle thirds for Amanngirrbach and middle and incisal thirds for GoldF did not differ regardless of the polishing protocols used.