Bonding to densely sintered alumina- and glass infiltrated aluminum / zirconium-based ceramics

Abstract

The objective of this study was to test two hypotheses: (1) silica coating affects the bond strength between ceramics and a resin cement; (2) bond strength is affected by the type of ceramic. Twelve blocks 5 x 6 x 8 mm of In-Ceram Zirconia (ZR) and twelve Procera AllCeram (PR) ceramics were made and duplicated in composite. Five blocks of each ceramic were treated as follows: (1) ZR + GB (laboratorial airborne particles abrasion with Al2O3 particles) + silane; (2) ZR + SC (chairside tribochemical silica coating system, Cojet); (3) PR + GB; (4) PR + SC. Two treated samples of ceramic were analyzed under SEM. The ceramic-composite blocks were cemented with Panavia F and stored in 37ºC distilled water for 7 days. They were then cut to produce bar specimens (n=30) with a bonding area of 0.6±0.1mm². Specimens were loaded to failure under tension in a universal testing machine (1 mm/min). Bond strength (sigma) values were statistically analyzed using ANOVA (Two-way) and Tukey (alpha = 0.05). Mean sigma (MPa) and standard deviation were as follows: 1) 15.1 ± 5.3; 2) 26.8 ± 7.4; 3) 12.7 ± 2.6; 4) 18.5 ± 4.7. Silica coated surfaces showed statistically higher sigma than the same substrate treated with GB only. In addition, ZR (with vitreous phase) showed higher ó than PR (without vitreous phase).

Bond strength of selected composite resin-cements to zirconium-oxide ceramic

“…Several authors have observed that a silica-coated zirconium oxide surface has a finer surface roughness than a surface sandblasted with aluminum oxide (9,12,16), which by electron microscopy appears to have a rougher surface due to the presence of micro-retentive grooves (2,11,16). …”

“…Cement bonding of oxide ceramics has been extensively studied (2,7-9,11-16); nevertheless, a reliability similar to that provided by silicate ceramics and resin cements has yet to be attained. The present study evaluates different methods of zirconium-oxide surface treatments in combination with different chemical agents.…”

<b>Cerâmicas odontológicas</b>: vantagens e limitações da zircônia

“…Logo a combinação, 69% de óxido de alumina (Al 2 O 3 ) com 31% de óxido de zircônio (ZrO 2 ), resultou num aumento da resistência flexural, consistindo numa formulação com um dos maiores valores de tenacidade entre os sistemas cerâmicos até então produzidos (6). Óxido de alumínio altamente purificado e densamente sinterizado, com 99,5% de alumina (Al 2 O 3 ), foi adicionado para confecção de subestruturas protéticas (26,39), criando-se as cerâmicas policristalinas. No entanto, a propagação de trincas em cerâmicas aluminizadas suscitou a criação da zircônia estabilizada por ítrio (Y-TZP), que possui elevada resistência à fratura, biocompatibilidade e Módulo de Young semelhante ao aço inoxidável.…”

Ultrasonic cleaning of silica-coated zirconia influences bond strength between zirconia and resin luting material

“…To achieve a strong bond to zirconia-based ceramics, surface preparation such as air abrasion or use of luting materials with functional monomers or etching technique have been developed and investigated [4][5][6] . Similarly, many reports have shown that tribochemical silica coating of restorations effectively increased the bond strength of resin luting materials to zirconia-based ceramics [7][8][9][10][11][12] .…”