IADR Abstract Archives
Development of Shear Bond Strength to Dentin of Self-Adhesive Resin Cements
Objectives: Recently, several manufacturers have launched new self-adhesive resin cements (SARCs), claiming excellent bond strength to the tooth surface. Shear bond strength (SBS) methods usually compare SBS after 24h or artificial aging. However, it is still unclear how quickly the bond strength develops. Therefore, this study compared initial SBS of SARCs with SBS after 24h and artificial aging.
Methods: Calibra® Universal (CU, Dentsply), Experimental Cement (EXP, 3M), G-CEM LinkAce™ (GCLA, GC), Maxcem Elite™ Chroma (MEC, Kerr), Panavia™ SA Cement Plus (PSAC+, Kuraray), PermaCem 2.0 (PC2, DMG), RelyX™ Unicem 2 Automix (RXU2, 3M ESPE) and SpeedCem® Plus (SCP, Ivoclar) were tested. All cements were used according to manufacturers’ instructions. Bovine teeth were ground flat to expose dentin, polished (grit 320 sandpaper), water-rinsed, and gently air-dried. Stainless steel rods (diameter=4mm) were sandpapered, sandblasted, silanized (ESPE™ Sil, 3M ESPE) and subsequently cemented (n=6) under standardized pressure (20g/mm2). The cement was irradiated from 4 sides (10s each; Elipar™ S10, 3M ESPE). Specimens for initial SBS were stored for 5 min at 36°C under pressure. Specimens for 24h were stored for 10 min at 36°C under pressure followed by additional 24h (36°C; 100% relative humidity) without pressure. Part of those specimens was subjected to artificial aging (thermocycling: 5000 cycles, 5°C-55°C). Shear bond strength testing was performed (Zwick Z010; n=6; speed=0.75mm/min). Data analysis was performed using One-Way ANOVA (Tukey; p<0.05).
Results: see table.
Conclusions: The Experimental Cement showed significantly higher initial shear bond strength (SBS) than all the other cements tested. In general, SBS increased after 24h with the Experimental Cement showing highest SBS. After artificial aging, bond strength dropped significantly for PermaCem 2.0, Panavia SA Cement Plus, and SpeedCem Plus while the other cements kept their bond strength level. The Experimental Cement showed significantly highest SBS after artificial aging.
Methods: Calibra® Universal (CU, Dentsply), Experimental Cement (EXP, 3M), G-CEM LinkAce™ (GCLA, GC), Maxcem Elite™ Chroma (MEC, Kerr), Panavia™ SA Cement Plus (PSAC+, Kuraray), PermaCem 2.0 (PC2, DMG), RelyX™ Unicem 2 Automix (RXU2, 3M ESPE) and SpeedCem® Plus (SCP, Ivoclar) were tested. All cements were used according to manufacturers’ instructions. Bovine teeth were ground flat to expose dentin, polished (grit 320 sandpaper), water-rinsed, and gently air-dried. Stainless steel rods (diameter=4mm) were sandpapered, sandblasted, silanized (ESPE™ Sil, 3M ESPE) and subsequently cemented (n=6) under standardized pressure (20g/mm2). The cement was irradiated from 4 sides (10s each; Elipar™ S10, 3M ESPE). Specimens for initial SBS were stored for 5 min at 36°C under pressure. Specimens for 24h were stored for 10 min at 36°C under pressure followed by additional 24h (36°C; 100% relative humidity) without pressure. Part of those specimens was subjected to artificial aging (thermocycling: 5000 cycles, 5°C-55°C). Shear bond strength testing was performed (Zwick Z010; n=6; speed=0.75mm/min). Data analysis was performed using One-Way ANOVA (Tukey; p<0.05).
Results: see table.
Conclusions: The Experimental Cement showed significantly higher initial shear bond strength (SBS) than all the other cements tested. In general, SBS increased after 24h with the Experimental Cement showing highest SBS. After artificial aging, bond strength dropped significantly for PermaCem 2.0, Panavia SA Cement Plus, and SpeedCem Plus while the other cements kept their bond strength level. The Experimental Cement showed significantly highest SBS after artificial aging.