Heat treatment of silanized feldspathic ceramic: Effect on the bond strength to resin after thermocycling

Abstract

Heat treatment of silanized feldspathic ceramic: effect on the bond strength to resin after thermocycling, International Journal of Adhesion and Adhesives, http://dx.Heat treatment of silanized feldspathic ceramic: effect on the bond strength to resin after thermocycling AbstractPurpose: This study aimed to evaluate the effect of heat treatment (at 77°C) of a silanized feldspathic ceramic on microtensile bond strength (μTBS) with a resin cement before and after being aged by thermocycling. Material and methods: Twenty-four blocks (12×10×4 mm) of a CADCAM feldspathic ceramic (Vitablocks Mark II, Vita) were obtained and randomly divided into three groups, according to the surface treatment prior to the cementation: Group AS -hydrofluoric acid 10% + silane; Group S77 -Silane + heating at 77°C for 60 s; and Group AS77 -hydrofluoric acid 10% + silane + heating at 77°C for 60 s.Ceramic blocks were cemented to composite resin blocks with a resin cement. The sets were subsequently cross-sectioned into 1 mm 2 beams for μTBS testing. The beams of each group were randomly divided into two subgroups: aging (thermocycling, 12,000 cycles between 5ºC and 55ºC) and non-aging (tested immediately). One-way ANOVA and Tukey's test (α = 0.05) and Weibull analysis (95% CI) were used to analyze the data. Results: Group AS77 had the lowest pre-test failure number during the cutting among the groups. There was no significant difference (p = 0.255) between the μTBS mean values of the non-aged groups. After aging, the mean value of S77 was significantly lower than those of AS77 and AS (p = 0.005).There was no difference in the Weibull modulus (m) and characteristic strength (σ o ) of the aged and nonaged groups for all comparisons. Before aging, heat treatment of silanized feldspathic ceramic (nonacid=etched surface) demonstrated bond strength similar to that achieved with hydrofluoric-acidetching treatment; however, it had lower bond strength after aging. Conclusion: The combination of hydrofluoric-acid-etching treatment with heat treatment silanized feldspathic ceramic did not improve the bond strength of the interface.

Comparison of Silane Heat Treatment by Laser and Various Surface Treatments on Microtensile Bond Strength of Composite Resin/Lithium Disilicate

“…The chemical bond between ceramic and composite resin is mainly caused by silane coupling agents; by forming a siloxane bond in response to an increase in the surface energy of the ceramics and the wettability of the cement, silane coupling agents establish adhesion between the inorganic phase of the ceramic and the organic phase of the bonding agent applied to the ceramic surface, resulting in microscopic interactions between both parts [19]. Hydrofluoric acid (HF) etching is one of the most prevalent ways to efficiently bond resin to the surface of glass ceramics [16,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Cementation of glassy matrix ceramics following HF etching and silanization has been recommended in several studies [17,19,27].…”

“…The Er:YAG laser wavelength is 2940 nm, which corresponds to the maximum of water absorption at the invisible spectrum [18,29]. Heat treatment may accelerate the silane, resulting in a long-lasting bond that strengthens the composite-ceramic link [3,5,13,19,[27][28][29][30][31][32][33][34][35]. Water, alcohol, and additional particles are removed from the ceramic surface during heat treatment; the removal of water accelerates the completion of the silane/silica surface condensation reaction and increases the creation of covalent silane/silica bonds.…”

“…Water, alcohol, and additional particles are removed from the ceramic surface during heat treatment; the removal of water accelerates the completion of the silane/silica surface condensation reaction and increases the creation of covalent silane/silica bonds. Evaporation of chemicals that would ordinarily hydrogen bond to the silica surface, such as alcohol, increases the number of bond sites available for interaction with silane [32,33]. Some methods have been described for the heat treatment, and the most common ones include drying with warm air [3,32,33], rinsing with hot water [13,31], using a preheated furnace or hot air oven [5,19,32], and a combination of these methods [15,33].…”

Silica coating followed by heat‐treatment of MDP‐primer for resin bond stability to yttria‐stabilized zirconia polycrystals

“…Thus, due to the chemical nature of silane‐based primer, it should be applied on surfaces which are rich in silicon oxide . An alternative to improve silane properties is through heat treatment via exposure to a furnace, which influences the coated silane layers. The outer region of the silane layer is composed by weak hydrolyzable oligomeric siloxane bonds, while the more internal zone contains stronger bonds, offering higher resistance to hydrolysis.…”

Influência do aquecimento de agentes de acoplamento químico na resistência de união de um cimento resinoso à zircônia

“…Os dois extremos da cadeia orgânica do silano são formados, de um lado por grupos vinil (-CH=CH2), allyl (-CH2CH=CH2), amino (-NH2) ou isocianato (-N=C=O), Fonte: Alex (55) Há evidências científicas de que, para acelerar o mecanismo de interação química entre silanos e superfícies inorgânicas, o uso do aquecimento pode aumentar a resistência de união entre as cerâmicas e cimentos. (57)(58)(59)(60) No entanto, ainda não há consenso sobre qual é a temperatura ideal para produzir um efeito melhor.…”