Tensile bond strength of adhesive systems: effects of primer and thermocycling

Abstract

The objective of this study was to evaluate the effects of primer and thermocycling on the bond strength of multi-purpose adhesive systems applied to enamel, under tensile stress. The following bonding systems were applied, according to the manufacturers' instructions, on unground enamel buccal surfaces of 96 premolars, with or without the application of primer: Scotchbond MP, OptiBond FL, Amalgambond Plus and OptiBond (dual-cure). A composite resin (Z100, 3M) was applied and light-cured in a cast metal hollow cone, which was previously fixed to the enamel surfaces. Half of the sample was subjected to 3,000 thermocycles (5-37 degrees C; 37-55 degrees C, dwell time of 60 s), and the other half was stored in water at 37 degrees C for the same period. The data were treated by means of ANOVA and no significant effects were detected, which indicates that tensile bond strength was not affected by the adhesive systems, application of primer or thermocycling.

Adhesion to Er:YAG Laser-prepared Dentin After Long-term Water Storage and Thermocycling

“…In an attempt to mimic the natural aging process of a dental restoration, thermocycling protocols [28][29][30][31][32] and the water storage of bonded specimens [33][34] have been suggested as efficient methods to provide in vitro simulation of in vivo conditions. Thermocycling has been the most used method to stress the adhesive interface, 31 while water storage has been shown to reduce bond strength, even after a short period of storage, indicating that bonds degrade over time.…”

Bond strength of different bracket bonding materials to the enamel subjected to thermal cycling

“…Thermocycling, among many methods, is considered a valid approach to simulate material aging in vitro 7,[9][10]13,17 ; however, there is no consensus in the literature on the number of cycles, temperature or immersion times [9][10] . Therefore, estimates of values close to in vivo conditions are extremely varied and the choice of such parameters is commonly based on convenience 7,[9][10] .…”

“…In this study, the samples were submitted to 1000, 2000 and 3000 thermal cycles, with immersion temperatures between 5° C and 55° C, 15-second dips and a 5-second interval between immersions, in order to allow comparisons with other studies that used similar conditions 7,12,[14][15]17 . In addition, the simulated aging corresponded to less than a year, since 10,000 (ten thousand) cycles would be needed to simulate one year of aging 19 , which poses great difficulties in terms of laboratory testing, since this would require months to be achieved.…”

“…The number of thermal cycles (1000, 2000 and 3000) was defined according to those commonly used in the literature, simulating aging for less than a year [16][17][18] , whereby 10,000 (ten thousand) cycles corresponded to one year of aging 19 . A thermocycling equipment was used (Elquip, São Carlos, Brazil) set at 15-second dips to 5 seconds of transfer time.…”

Influência da fotopolimerização e termociclagem na adesão de compósitos ortodonticos

“…A termociclagem não causou redução nos valores da resistência ao cisalhamento dos três materiais avaliados, como também observado em outros adesivos ortodônticos (1). No entanto, o comportamento desses materiais foi influenciado pela termociclagem, como mostra a figura 2.…”