A novel bioactive agent improves adhesion of resin-modified glass-ionomer to dentin

Abstract

Bioactive glasses are surface-active and able to induce remineralization of dentin. Two resin-modified glass-ionomer cements (RMGICs) doped with bioactive glass (Biosilicate^®) were used as restorative materials in dentin. Experimental powders were made by incorporating 2, 5, and 10 wt% of Biosilicate^® in Vitremer^® (VT) and Fuji II LC^® (FL) powders. Commercial FL and VT were used as control materials. Six cylinders of each material were tested for failure in compression (1.0 mm/min), after 24 h storage in distilled water at 37 °C. For microtensile bond strength (MTBS) test, cavity preparations were performed on 30 noncarious human molars and restored with the tested materials. Teeth were stored in water (37 °C) for 24 h or 7 days, sectioned into beams and tested for failure in tension (0.5 mm/min). Data were analyzed by analysis of variance and multiple-comparison tests (p < 0.05). Analysis of debonded specimens was performed by scanning electron microscopy. Only incorporation of 2 wt% of Biosilicate^® did not decrease compressive strength of the RMGICs. Two weight percent of Biosilicate^® into RMGICs produced an increase in MTBS after 24 h for FL and after 24 h and 7 days for VT. Two weight percent of Biosilicate^® particles into RMGICs did not affect compressive strength and improved MTBS to dentin.

Keywords:

• resin-modified glass ionomer cement
• dentin
• adhesion
• compression
• bioactive materials

Acknowledgments

This investigation was supported in part by Grants: CICOM/FEDER MAT 2011-24551; JA-P08-CTS-3944 and Fapesp 07/08179-7. The authors thank Dr Christian Ravagnani for the preparation of the Biosilicate^® powder.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This investigation was supported in part by Grants: CICOM/FEDER MAT 2011-24,551; JA-P08-CTS-3944 and Fapesp 07/08,179-7.