IADR Abstract Archives
Adhesion and Mechanical Retention of a New Liner/Base Material
Objectives: The goal of this study was to probe the structural integrity over time during the service life for previously cured experimental liner/base hybrid RMGI in comparison to a commercial calcium silicate-based material.
Methods: Dentin Adhesion: Bovine teeth (nmin=4) were potted and sanded under water-flow finishing with 320-grit sandpaper. 150µm thick tape with a 5mm diameter hole was placed onto the dentin, filled with liner/base, and cured per the manufacturer’s instructions. 3M™ Scotchbond™ Universal Plus Adhesive was then applied over the liner/base and cured per the manufacturer’s instructions. The restoration was completed by placing 3M™ Filtek™ Z250 Restorative using a PTFE mold (5 mm diameter, 2 mm thick) and curing per the manufacturer’s instructions. The samples were incubated in a humidity chamber at 37°C/95%RH for 30min and stored in a water bath at 37°C for the time indicated. Shear bond strength was determined using an Instron in shear mode per Ultradent’s Notched-Edge method. Flexural Strength: With ISO 9917-2:2017 guidance, 2x2x25mm bars for each liner/base were constructed (n=4). The incubation was completed at 37°C for the times indicated. The flexural strength was also determined via an Instron instrument. The following materials were tested: Experimental Liner/Base from 3M (EXP, hybrid-RMGI) and BISCO TheraCal LC® Resin-Modified Calcium Silicate Pulp Protectant/Liner (TLC).
Results: The mean values for dentin adhesion and flexural strength and resulting standard deviations and grouping are shown below. Data was analyzed using one-way ANOVA with 95% confidence Tukey’s method.
Conclusions: Dentin adhesion of the EXP hybrid-RMGI material was significantly higher than that of TLC. Furthermore, during the material service life, the dentin adhesion increased for EXP while TLC decreased, although not significantly due to low initial adhesion. The flexural strength remained similar for both EXP and TLC during this experiment. While statistical differences were determined, no discernable trend was observed.
Methods: Dentin Adhesion: Bovine teeth (nmin=4) were potted and sanded under water-flow finishing with 320-grit sandpaper. 150µm thick tape with a 5mm diameter hole was placed onto the dentin, filled with liner/base, and cured per the manufacturer’s instructions. 3M™ Scotchbond™ Universal Plus Adhesive was then applied over the liner/base and cured per the manufacturer’s instructions. The restoration was completed by placing 3M™ Filtek™ Z250 Restorative using a PTFE mold (5 mm diameter, 2 mm thick) and curing per the manufacturer’s instructions. The samples were incubated in a humidity chamber at 37°C/95%RH for 30min and stored in a water bath at 37°C for the time indicated. Shear bond strength was determined using an Instron in shear mode per Ultradent’s Notched-Edge method. Flexural Strength: With ISO 9917-2:2017 guidance, 2x2x25mm bars for each liner/base were constructed (n=4). The incubation was completed at 37°C for the times indicated. The flexural strength was also determined via an Instron instrument. The following materials were tested: Experimental Liner/Base from 3M (EXP, hybrid-RMGI) and BISCO TheraCal LC® Resin-Modified Calcium Silicate Pulp Protectant/Liner (TLC).
Results: The mean values for dentin adhesion and flexural strength and resulting standard deviations and grouping are shown below. Data was analyzed using one-way ANOVA with 95% confidence Tukey’s method.
Conclusions: Dentin adhesion of the EXP hybrid-RMGI material was significantly higher than that of TLC. Furthermore, during the material service life, the dentin adhesion increased for EXP while TLC decreased, although not significantly due to low initial adhesion. The flexural strength remained similar for both EXP and TLC during this experiment. While statistical differences were determined, no discernable trend was observed.
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