Efeito de tratamento de superfície na composição de zircônia e na resistência de união com diferentes cimentos
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Data
2013-03-08
Autores
Sciasci, Plínio [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A zircônia tetragonal policristalina estabilizada por ítria (Y-ZTP), em virtude de suas propriedades mecânicas, pode ser indicada para restaurações dento ou implantosuportadas. Porém, em função de sua composição, este material apresenta dificuldade de se unir eficazmente com os cimentos, comprometendo assim a longevidade das restaurações. O objetivo desse estudo foi avaliar a influência de diferentes tratamentos de superfície e cimentos na resistência ao cisalhamento (RC) de uma Y-ZTP, assim como a caracterização química da superfície da zircônia após os jateamentos. Duzentos e quarenta discos de Y-ZTP (5 x 2 mm) foram obtidos e aleatoriamente divididos em 5 grupos (n=40) de acordo com os tratamentos de superfície: 1) jateamento com óxido de alumínio (Al2O3) de 50 μm + silano; 2) jateamento com Al2O3 de 120 μm + silano; 3) jateamento com partículas de Al2O3 modificadas por sílica (Rocatec Soft) (30 μm) + silano; 4) jateamento com Al2O3 de 120 μm seguido do jateamento com partículas de Al2O3 modificadas por sílica (110 μm) (Rocatec Plus) e 5) Rocatec Plus + silano. Discos de resina composta (Filtek Z350 XT) foram confeccionados e imediatamente cimentados sobre a superfície da zircônia com os seguintes cimentos (n=12): 1) RelyX Luting 2; 2) RelyX ARC; 3) RelyX U100; e 4) Panavia F 2.0. Os silanos usados foram: 1) RelyX Ceramic Primer para os cimentos RelyX Luting 2, RelyX ARC e RelyX U100 e 2) Clearfil SE Bond Primer/Clearfil Porcelain Bond Activator para o cimento Panavia F 2.0. Após a cimentação, os espécimes foram armazenados por 6 dias em meio seco à 37ºC antes da ciclagem térmica (10.000 ciclos, 5 – 55ºC, 30 s/banho) para então serem submetidas ao teste de RC em máquina universal de ensaios (EMIC DL2000). Os dados foram analisados por meio de ANOVA 2 fatores e teste de Tukey ( =0,05)...
Due to their excellent mechanical properties, biocompatibility, low thermal conductivity, and chemical stability, Y-TZP (yttria-stabilized tetragonal zirconia polycrystal) ceramics have been used to manufacture metal-free tooth- or implantsupported prostheses. However, the conventional surface treatments (hydrofluoric acid etching and silanization) used for silica ceramics are not effective in promoting suitable bonding between resin-based materials and zirconia. Therefore, the purpose of this in vitro study was to evaluate the effect of different surface treatments on the shear bond strength (SBS) of luting cements to yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and on its surface chemical characterization. Two hundred and forty Y-TZP discs (5 × 2 mm) were obtained and randomly divided into 5 airborneparticle abraded groups (n=48): 1) 50 μm Al2O3 particles; 2) 120 μm Al2O3 particles; 3) 30 μm silica-modified Al2O3 particles (Rocatec Soft); 4) 120 μm Al2O3 particles, followed by 110 μm silica-modified Al2O3 particles (Rocatec Plus); and 5) Rocatec Plus. After airborne-particle abrasion the surfaces were treated with silane coupling agent. Composite resin discs (Filtek Z350 XT) were produced and bonded immediately to the zirconia-treated surfaces (n=12) with: 1) RelyX Luting 2; 2) RelyX ARC; 3) RelyX U100; or 4) Panavia F 2.0. The silanes used were RelyX Ceramic Primer (RelyX Luting 2, RelyX ARC and RelyX U100) and Clearfil SE Bond Primer/Clearfil Porcelain Bond Activator (Panavia F 2.0). The bonded specimens were stored for 6 days in dry conditions at 37ºC before thermal cycling (10,000 cycles, 5 to 55ºC) and then tested for SBS in a mechanical testing machine (EMIC DL2000). Data were analyzed by two-way ANOVA and Tukey HSD post hoc test ( =.05). Failure mode was determined with a stereomicroscope (×20). The... (Complete abstract click electronic access below)
Due to their excellent mechanical properties, biocompatibility, low thermal conductivity, and chemical stability, Y-TZP (yttria-stabilized tetragonal zirconia polycrystal) ceramics have been used to manufacture metal-free tooth- or implantsupported prostheses. However, the conventional surface treatments (hydrofluoric acid etching and silanization) used for silica ceramics are not effective in promoting suitable bonding between resin-based materials and zirconia. Therefore, the purpose of this in vitro study was to evaluate the effect of different surface treatments on the shear bond strength (SBS) of luting cements to yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and on its surface chemical characterization. Two hundred and forty Y-TZP discs (5 × 2 mm) were obtained and randomly divided into 5 airborneparticle abraded groups (n=48): 1) 50 μm Al2O3 particles; 2) 120 μm Al2O3 particles; 3) 30 μm silica-modified Al2O3 particles (Rocatec Soft); 4) 120 μm Al2O3 particles, followed by 110 μm silica-modified Al2O3 particles (Rocatec Plus); and 5) Rocatec Plus. After airborne-particle abrasion the surfaces were treated with silane coupling agent. Composite resin discs (Filtek Z350 XT) were produced and bonded immediately to the zirconia-treated surfaces (n=12) with: 1) RelyX Luting 2; 2) RelyX ARC; 3) RelyX U100; or 4) Panavia F 2.0. The silanes used were RelyX Ceramic Primer (RelyX Luting 2, RelyX ARC and RelyX U100) and Clearfil SE Bond Primer/Clearfil Porcelain Bond Activator (Panavia F 2.0). The bonded specimens were stored for 6 days in dry conditions at 37ºC before thermal cycling (10,000 cycles, 5 to 55ºC) and then tested for SBS in a mechanical testing machine (EMIC DL2000). Data were analyzed by two-way ANOVA and Tukey HSD post hoc test ( =.05). Failure mode was determined with a stereomicroscope (×20). The... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Zirconio, Cimentos de resina, Resistência ao cisalhamento, Zirconia
Como citar
SCIASCI, Plínio. Efeito de tratamento de superfície na composição de zircônia e na resistência de união com diferentes cimentos. 2013. 108 f. Dissertação (mestrado) Universidade Estadual Paulista Julio de Mesquita Filho, Faculdade de Odontologia de Araraquara, 2013.