Effects of Surface Treatments, Thermocycling, and Cyclic Loading on the Bond Strength of a Resin Cement Bonded to a Lithium Disilicate Glass Ceramic

摘要: SUMMARY Objectives : The aim of this present study was to investigate the effect two surface treatments, fatigue and thermocycling, on microtensile bond strength a newly introduced lithium disilicate glass ceramic (IPS e.max Press, Ivoclar Vivadent) dual-cured resin cement. Methods A total 18 blocks (10 mm long × 7 wide 3.0 thick) were fabricated divided into six groups (n=3): 1, 2, 3-air particle abraded for five seconds with 50-μm aluminum oxide particles; 4, 5, 6-acid etched 10% hydrofluoric acid 20 seconds. silane coupling agent applied onto all specimens allowed dry seconds, bonded block composite Tetric N-Ceram (Ivoclar RelyX ARC (3M ESPE) cement placed under 500-g static load minutes. excess removed disposable microbrush, four periods light activation 40 each performed at right angles using an LED curing unit (UltraLume Ultradent) final second exposure from top surface. All stored in distilled water 37°C 24 hours. Groups 2 5 submitted 3,000 thermal cycles between 5°C 55°C, 3 6 test 100,000 Hz. Specimens sectioned perpendicular bonding area obtain beams cross-sectional 1 mm(2) (30 per group) testing machine (EZ Test) crosshead speed 0.5 mm/min. Data analysis variance Tukey post hoc (p≤0.05). Results values (MPa) 26.9 ± 6.9, 22.2 7.8, 21.2 9.1 1-3 35.0 9.6, 24.3 8.9, 23.9 6.3 4-6. For control group, thermocycling produced predominance adhesive failures. Fatigue significantly decreased both treatments when compared groups. Etching increased group.