Caracterização mecânica e tribológica de dois glazeadores disponíveis comercialmente e uma composição experimental

• Ano de defesa: 2012
• Autor(a) principal: Vimercati, Bianca Mataveli
• Orientador(a): Miranda, Mauro Sayão de
• Banca de defesa: Perez, Cesar dos Reis , Sampaio Filho, Hélio Rodrigues , Dias, Katia Regina Hostilio Cervantes , Masioli, Marco Antônio , Queiroz, Daher Antonio
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Odontologia
• Departamento: Centro Biomédico::Faculdade de Odontologia
• País: BR
• Palavras-chave em Português: Resina Composta; Glazeador; Rugosidade; Dureza; Desgaste
• Palavras-chave em Inglês: Composite Resin; Glaze; Roughness; Hardness; Wear
• Área do conhecimento CNPq: CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA::MATERIAIS ODONTOLOGICOS
• Link de acesso: http://www.bdtd.uerj.br/handle/1/14034

The aim of this in vitro study was to assess through mechanical and tribological tests the application of two commercially available glazes and one experimental composition as coverage material in composite resin restorations regarding the surface roughness, hardness and wear resistance. Twenty-four specimens of Z350XT composite (3M/ESPE) were made and distributed into four groups. The control group (CG) did not receive any sealing, the Biscover LV group (BG) received application of the Natural Glaze (Nova DFL) and the Experimental group (EG) received application of an experimental glaze containing nanoparticles (1% weight). Subsequently, the specimens were subjected to analysis of surface roughness using a profilemeter and hardness assessment through a nanoindenter, which also provides the elastic modulus of the material. Then, the specimens were subjected to alternated linear wear test during 15,000 cycles with load of 5N in distilled water. The maximum wear depth was assessed by a profilemeter. The data analysis for the surface roughness (in µm) was performed using the ANOVA/Duncan test (p-value = .000). The mean and standard deviation values were: CG, 0.12 (0.01); BG, 0.06 (0.01); NG, 0.13 (0.02); EG, 0.13 (0.01). The hardness analysis (GPa) and elastic modulus (GPa) were assessed by applying the Kruskal-Wallis non-parametric test. The mean and standard deviation values for the hardness were: CG, 0.10 (0.24); BG, 0.31(0.004); NG, 0.08(0.004); EG, 0.12 (0.008), for load of 1.25 mN; CG,1.08 (0.139); BG, 0.32 (0.004); NG, 0.08 (0.003); EG, 0.13 (0.006) for load of 2.5 mN; CG, 1.10 (0.101); BG, 0.33 (0.003); NG, 0.09 (0.002); EG, 0.13 (0.056), for load of 5.0 mN. The mean and standard deviation values for the elastic modulus were: CG, 17.71 (1.666); BG, 44 (0.084); NG, 3.484 (0.114); EG, 4.55 (0.178) for load of 1.25 mN; CG, 17.5 (1.449); BG, 5.18 (0.065); NG, 3.38 (0.078); EG, 4.55 (0.12) for load of 2.5 mN; CG, 17.69 (1.793); BG, 5.04 (0.041); NG, 3.63 (0.066); EG, 4.85 (0.104) for load of 5.0 mN. The data analysis for the wear depth (µm) was performed usingn ANOVA/Dunnett tests (p-value = .000). The mean and standard deviation values were: CG, 12.51 (0.89); BG, 0.59 (0.07); NG, 1.41 (0.12); EG, 1.84 (0.18). From the showed outcomes may be concluded that only the Biscover LV could reduce the surface roughness of the tested composite resin. The remainder, Natural Glaze and Experimental, did not change the surface roughness and were statistically similar among themselves and to the control group. All tested glazes reduced the hardness and elastic modulus of composite resin when compared with the control group, differing among themselves, showing an ascending order of hardness and elastic modulus (NaturalGlaze < Experimental < Biscover < Control). All tested glazes could reduce the wear of the composite resin, when compared with the control group, differing among themselves, showing an ascending order of wear (Biscover < NaturalGlaze < Experimental < Control).