Análise da superfície da zircônia monolítica multicamadas mediante diferentes protocolos de polimento

Abstract

The present in vitro study aims to analyze the roughness and surface morphology of multilayer monolithic zirconia through wear, simulating an adjustment process during installation, and assessing the effects of various polishing protocols. Two different brands of zirconia were examined, namely: Amann Girrbach Zolid FX Multilayer, Koblach, Austria, and GoldF ML Multilayer, Hong Kong, China. They were manufactured and divided into six groups, each containing ten samples (n = 10), identified as follows: CO (Control - no wear), DA (EVE Diacera - wheel with diamond particles), PA (Diamond Paste Polishing Paste with Aluminum oxide), PD (Diamond Excel Polishing Paste with diamond grains), EX (Exa-Cerapol – KIT with three steps), and GL (Glaze Paste Insync). It's worth noting that, irrespective of the number of polishing steps in the mentioned groups, all samples were subjected to the same polishing duration of 60 seconds. The samples were created using a CAD/CAM system with dimensions of 2.0x3.0x2.5mm. They were then roughened with 1200 grit sandpaper before sintering and subsequently subjected to the corresponding polishing protocols for each group. After applying the polishing protocols, quantitative analyses were conducted concerning surface roughness, and qualitative analyses were performed using a scanning electron microscope (SEM) before and after polishing. The effectiveness of all tested protocols was evident, leading to significant statistical differences (p≤0.05) when comparing the surfaces before and after polishing. The lowest Ra and Rz values were observed in the DA and GL groups. The morphological findings confirmed the quantitative results, revealing smoother and more polished surfaces for the DA and GL groups. Differences in roughness were found depending on the type of zirconia for the PA and EX groups. In conclusion, the surface polishing protocols exhibited variations in the morphology and roughness of the analyzed samples. It is worth noting that some polishing protocols may yield different outcomes depending on the type of zirconia used.