Influência do acabamento e polimento na resistência à flexão de uma cerâmica odontológica

• Autor(a) principal: Suarez, Alexandre Vicente Garcia
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14126
• topic: Porcelains; Burnishing; Flexural resistance; Rugosity; Porcelanas; Polimento; Flexão; Rugosidade; Cerâmica odontológica; Dentes - Polimento; Resistência de materiais (Odontologia); Aspereza de superfície (Odontologia); CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The objective of this study was to evaluate the influence of two systems of finishing and polishing in the flexural resistance of feldspatic ceramic EX-3 (Noritake). Ceramic blocks with measures in compliance with ISO 6872/1995 were confectioned following the manufacturer´s instructions. After the confection of the blocks and attainment of natural glaze, the standardization in terms of superficial rugosity was evaluated by means of a rugosimeter, and the blocks were then divided into five groups. One of the groups was tested in this condition (natural glaze) being Group I (control). For the tests carried through the other groups, the blocks were burnished by means of a 4137 (KG Sorensen) diamond bur. After that, they were polished with different protocols which characterized the other groups. In group II, the Dura white (Shofu) polishing system was evaluated. In group III, the same system was used, but now followed by a diamond paste in a felt wheel, In group IV, the polishing system Exa Cerapol (Edenta) was used and in the group V, this system was followed by a diamond paste in a felt wheel. After these procedures, the obtained rugosities were evaluated (Ra), in order to evaluate the effectiveness of the tested methods. The statistical analysis of ANOVA (p ≤ 0,05) showed that there were not statistical significant differences between the groups (G2=3.82±0.58; G3=3.55±0.61; G4=4.05±0.40; G5=3.95±0.47). After that, the specimen were submitted to a three points flexural strength test in a universal testing machine, and also in this case that, the statistically treated results didn´t demonstrate statistical differences between the groups (G1=132.1±26.9 MPa; G2=123.3±17.4 MPa; G3=114.5±19.3 MPa; G4=104.2±11.9 MPa e G5=104.7±19.1 MPa). It was possible to conclude that the use of the tested systems allows to get polished surfaces similar to the natural glazed ones. and that they don´t decrease the flexural resistance of the used ceramics.