IADR Abstract Archives
Interfacial Integrity of a S-PRG Containing Resin Cement to Dentin
Objectives: To evaluate the properties of a surface reaction-type pre-reacted glass-ionomer (S-PRG) incorporated resin-cement in resisting cariogenic biofilm induced dentin demineralization, the dentin bond strength and the cement-dentin interface after acid-base challenge.
Methods: Self-adhesive resin-cements, experimental S-PRG containing cement (ES), conventional filler containing cement (CS) and PANAVIA SA Luting Cement Plus (SA), were tested. An approximately 1×5 mm2 sized groove was prepared in the middle of a square-shaped specimen from the middle part of dentin. Streptococcus mutans biofilms were then formed on the resin cement filled surfaces using in an oral biofilm reactor for 20 hours and incubated for 1-day and 3-day to undergo demineralization. The demineralized dentin around cement after bacterial demineralization was checked with a 3D-Confocal Laser Scanning Microscope (CLSM). Thirty dentin surfaces from caries-free molars were ground with 600 SiC paper and bonded with one of the self-adhesive resin-cements. The microshear bond strength (μ SBS) test was performed at a crosshead speed of 1 mm/min. The statistical analysis was done by two-way ANOVA with Bonferroni correction. The interface of the bonded specimens after acid-base challenge was also examined by SEM.
Results: The data from CLSM analysis showed that the lesion size was smallest in ES with statistically significant differences (p < 0.05). Demineralization along the wall extended deeper in CS and SA compared to ES and acid penetration was significantly deeper in CS 3-day samples. The μ SBS of ES were significantly higher than those of CS and SA in which CS and SA showed statistically significant differences after 5,000 thermalcycling (p<0.05). An acid-base resistant zone was observed in only ES groups.
Conclusions: ES might have the property of resisting dentin demineralization from the bacterial acid attack. It also presented durability against acid-base challenge and provided a reliable bonding performance to dentin.
Methods: Self-adhesive resin-cements, experimental S-PRG containing cement (ES), conventional filler containing cement (CS) and PANAVIA SA Luting Cement Plus (SA), were tested. An approximately 1×5 mm2 sized groove was prepared in the middle of a square-shaped specimen from the middle part of dentin. Streptococcus mutans biofilms were then formed on the resin cement filled surfaces using in an oral biofilm reactor for 20 hours and incubated for 1-day and 3-day to undergo demineralization. The demineralized dentin around cement after bacterial demineralization was checked with a 3D-Confocal Laser Scanning Microscope (CLSM). Thirty dentin surfaces from caries-free molars were ground with 600 SiC paper and bonded with one of the self-adhesive resin-cements. The microshear bond strength (μ SBS) test was performed at a crosshead speed of 1 mm/min. The statistical analysis was done by two-way ANOVA with Bonferroni correction. The interface of the bonded specimens after acid-base challenge was also examined by SEM.
Results: The data from CLSM analysis showed that the lesion size was smallest in ES with statistically significant differences (p < 0.05). Demineralization along the wall extended deeper in CS and SA compared to ES and acid penetration was significantly deeper in CS 3-day samples. The μ SBS of ES were significantly higher than those of CS and SA in which CS and SA showed statistically significant differences after 5,000 thermalcycling (p<0.05). An acid-base resistant zone was observed in only ES groups.
Conclusions: ES might have the property of resisting dentin demineralization from the bacterial acid attack. It also presented durability against acid-base challenge and provided a reliable bonding performance to dentin.
