IADR Abstract Archives
Shear Bond Strength and Artificial Aging of Self-adhesive Resin Cements
Objectives: The aim of this study is to determine shear bond strength (SBS) of self-adhesive resin cements (SARCs) to the challenging substrate dentin before and after artificial aging.
Methods: Bovine teeth were ground flat to expose the dentin layer, polished with grit 320 sandpaper, distilled water-rinsed and gently air dried. Stainless steel rods (diameter = 4mm) were sandpapered, sandblasted, silanized (ESPETM Sil, 3M ESPE) and cemented to the dentin exposed teeth (n=12 per group) under a pressure of 20g/mm2. For self-curing cements, glycerin gel (AirblockTM, Dentsply) was applied to the margins of the cemented area and specimens were stored in a 36o C incubator for 10 minutes. For light-curing cements, the cemented steel was light cured from 4 sides of cemented area (10s each, EliparTM S10, 3M ESPE). The 20 g/mm2 pressure was removed and all samples were stored for 24h (360 C, 100% relative contained humidity). Six specimens from each cement underwent artificial aging (thermocycling (TC): 5000 cycles, 5oC – 55oC) before SBS testing (Zwick Z010, n=6, speed 0.75mm/min). Data analysis was performed using One-Way ANOVA (Tukey; p<0.05).
Results: See data in table 1.
Conclusions: EXP showed significantly higher SBS to dentin under all testing conditions. CU and TC showed a decrease in bond strength after artificial aging. Overall, light curing delivered higher SBS than self-curing except for EXP where values were the same in both curing methods.
Methods: Bovine teeth were ground flat to expose the dentin layer, polished with grit 320 sandpaper, distilled water-rinsed and gently air dried. Stainless steel rods (diameter = 4mm) were sandpapered, sandblasted, silanized (ESPETM Sil, 3M ESPE) and cemented to the dentin exposed teeth (n=12 per group) under a pressure of 20g/mm2. For self-curing cements, glycerin gel (AirblockTM, Dentsply) was applied to the margins of the cemented area and specimens were stored in a 36o C incubator for 10 minutes. For light-curing cements, the cemented steel was light cured from 4 sides of cemented area (10s each, EliparTM S10, 3M ESPE). The 20 g/mm2 pressure was removed and all samples were stored for 24h (360 C, 100% relative contained humidity). Six specimens from each cement underwent artificial aging (thermocycling (TC): 5000 cycles, 5oC – 55oC) before SBS testing (Zwick Z010, n=6, speed 0.75mm/min). Data analysis was performed using One-Way ANOVA (Tukey; p<0.05).
Results: See data in table 1.
Conclusions: EXP showed significantly higher SBS to dentin under all testing conditions. CU and TC showed a decrease in bond strength after artificial aging. Overall, light curing delivered higher SBS than self-curing except for EXP where values were the same in both curing methods.
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