Effect of pre-heated dual-cured resin cements on the bond strength of indirect restorations to dentin
AUTOR(ES)
Morais, Alexandre, Santos, Alline Rachid Abreu dos, Giannini, Marcelo, Reis, Andre Figueiredo, Rodrigues, José Augusto, Arrais, César Augusto Galvão
FONTE
Brazilian Oral Research
DATA DE PUBLICAÇÃO
2012-04
RESUMO
This study evaluated the effects of resin luting agents (LA) polymerized using increased temperature on the in vitro microtensile bond strength (mTBS) of indirect restorations to dentin. The occlusal dentin surfaces of 40 human third molars were exposed and flattened. The teeth were assigned to 8 groups (n = 5) according to the LA temperature (25°C o r 50°C), curing mode (dual- or self-curing mode), and product (Excite DSC/Variolink II [VII] and XP Bond/Calibra [Cal]). The bonding agents were applied to the dentin surfaces according to manufacturers' instructions. For preheated groups, the LAs were heated to 50°C, subsequently mixed on a heated stirrer surface, and applied to the previously heated pre-polymerized resin discs (2 mm thickness, TPH-Spectrum). The discs were bonded to the dentin surfaces, and the LAs were either exposed to a curing light according to manufacturers' instructions or allowed to self-cure. Specimens were stored in relative humidity at 37°C for 7 days. Specimens were mesio-distally and bucco-lingually sectioned to obtain multiple bonded beams with a 1-mm² cross-sectional area for mTBS testing. Data (MPa) were analyzed by 2-way ANOVA and Tukey's post hoc test (a = 5%) for each product. Specimen failure patterns were analyzed using a scanning electron microscope. VII groups showed higher mTBS at 50°C than at 25°C regardless of curing mode (p = 0.05). Cal groups showed similar mTBS at 25°C and 50°C in all activation modes. The use of some dual-polymerizing LAs at 50°C may improve the mTBS of indirect restorations to dentin.
Documentos Relacionados
- Pre-heated dual-cured resin cements: analysis of the degree of conversion and ultimate tensile strength
- Effect of curing mode on the hardness of dual-cured composite resin core build-up materials
- Influence of the composition and shades of ceramics on light transmission and degree of conversion of dual-cured resin cements
- Color Stability of Ceramic Veneers Luted With Resin Cements and Pre-Heated Composites: 12 Months Follow-Up
- Effect of thickness of indirect restoration and distance from the light-curing unit tip on the hardness of a dual-cured resin cement