Abstract
ABSTRACT Objective Evaluate the influence of silane heat treatment in bond durability between two resin cements and CAD/CAM feldspathic ceramic. Methods 40 feldspathic ceramic blocks were obtained, and were duplicated in microhybrid composite. All ceramic blocks were etched with 10% hydrofluoric acid for 20 s and received application of silane agent. The blocks were randomizedinto eight groups (n=5) according to the surface treatments and luting agents: P- Panavia F; PAg- Panavia F + Aging; HP- Heat Treatment + Panavia F; HPAg- Heat Treatment + Panavia F + Aging; R- RelyX ARC; Rag- RelyX ARC + Aging; HR- Heat Treatment + RelyX ARC; HRAg- Heat Treatment + RelyX ARC + Aging. The heat treatment was performed in furnace at 100 °C for 2 min. All blocks were cemented and cut to obtain samples with adhesive area of 1 mm2. Aging was performed with 10000 thermal cycles. The samples were subjected to microtensile bond strength test. Results The three-way ANOVA test revealed a significant interaction between cement versus heat treatment (p=0.001) and heat treatment versus thermal cycling (p=0.001) indicating that there was a change in bond strength due to surface treatment and aging. Conclusion Therefore, the heat treatment of the silane at 100 ºC for 2 minutes obtained higher values of bond strength between the resin cement and a feldspathic ceramicafter aging.
Highlights
Feldspathic ceramic is classified as an acid-sensitive ceramic; the surface can be treated with hydrofluoric acid, creating a topographic pattern that favors its micromechanical retention on restored teeth [1,2,3]
The three-way ANOVA test revealed a significant interaction between cement versus heat treatment (p = 0.001) and heat treatment versus thermal cycling (p = 0.001) indicating that there was a change in bond strength due to surface treatment and aging
In the analysis of groups without aging, the highest value of bond strength was recorded in the Panavia resin cement group that received to silane heat treatment
Summary
The use of chemical substances, such as a silane bond agent, is recommended. The chemical bond promoted by the silane coupling agent is the main mechanism behind feldspathic ceramic adhesion to resin cements [6,7]. The implementation of heat treatment protocols prior to adhesive cementation has been suggested to improve the properties of the silane-coupling agent [78]. This pre-treatment helps eliminate water, alcohol, and other by-products from the ceramic surface, in addition to assisting in the completion of the condensation reaction between silica and silane, promoting the formation of a covalent bound at the ceramic-silane interface, increasing the effectiveness and durability of the adhesion [7,8]
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