Análise da rugosidade superficial da cerâmica feldspática após acabamento e polimento

Abstract

A strong reason that has taken patients to the dental office is the search for facial harmony, for this, there are a multitude of techniques and materials available. Ceramics are materials that meet the aesthetic and functional requirements of patients for having better properties when compared to other restorative materials, such as composites, acrylic and metals. The feldspathic, one of the types of ceramic available, when used, present satisfactory appearance. The present study aimed to analyze the in vitro properties of the effects of finishing and polishing on the feldspathic ceramic. A laboratory study was carried out, adopting an inductive approach, using a statistical and comparative procedure, using a direct laboratory documentation technique. Twenty-one samples of dental ceramic (Vita VM, 13-Germany, Lot.66060), 2 mm thick and 6 mm in diameter, were prepared individually in a metal matrix. The resulting samples were sintered in a ceramic furnace (Alumini 50 / EDG, São Carlos, SP, Brazil) and subjected to the polishing with water sands based on aluminum oxide n.400 / 600/12000 and glazing, according to the manufacturer's instructions. Afterwards, an initial analysis of its surface roughness was made using a profilometer. Samples were divided into 3 groups (n = 7), all groups were submitted to surface treatment with 4219F diamond tip wear, but only group 2 was polished with the Intra-Oral Dhpro kit (Rhadartrade Com. Imp. Ltda., Paranaguá, Paraná, Brazil) and group three was polished with the Intra-Oral Exa-Cerapol kit (Edenta / Labordental Ltda., São Paulo, Brazil). After surface treatment, the roughness values were again measured. These were analyzed statistically by Kruskal Wallis, Mann Whitney and Wilcoxon test (p <0.05). As results, only Group I initially had a statistically significant difference in the roughness of the other groups. In the final analysis, all groups showed statistically significant differences (p=0,018). Group I had the highest average roughness, while Group II had the lowest average. It was concluded that none of the groups was able to reestablish the roughness produced by the glaze.