The physical characteristics of resin composite–calcium silicate interface as part of a layered/laminate adhesive restoration

• Published in: Dental materials Vol. 30; no. 3; pp. 343 - 349
• Main Authors: Hashem, Danya F, Foxton, Richard, Manoharan, Andiappan, Watson, Timothy F, Banerjee, Avijit
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.03.2014
• Subjects: Acid Etching, Dental; Adhesive; Advanced Basic Science; Biodentin; Calcium Compounds - chemistry; Calcium silicate cement; Composite Resins - chemistry; Dental Bonding; Dental Cements - chemistry; Dental Prosthesis Design; Dental Restoration Failure; Dental Stress Analysis; Dentin bonding agent; Dentistry; Failure mode; Glass ionomer cement; Glass Ionomer Cements - chemistry; Micro-shear bond strength; Microscopy, Electron, Scanning; Resin-modified glass ionomer cement; SEM; Shear Strength; Silicates - chemistry; Surface Properties; Failure mode; Glass ionomer cement; SEM; Dentin bonding agent; Adhesive; Micro-shear bond strength; Calcium silicate cement; Biodentin; Resin-modified glass ionomer cement
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/j.dental.2013.12.010

Abstract Objectives To compare in-vitro micro-shear bond strengths (μSBS) of resin composite to calcium silicate cement (Biodentine™) vs. glass ionomer cement vs. resin modified glass ionomer cement (RM-GIC) using an adhesive in self-etch (SE)/total etch (TE) mode after aging three substrates and bond and characterizing their failure modes. Methods Resin composite was SE/TE bonded to 920 standardized disks of Biodentine™, GIC & RM-GIC. Dividing samples into two groups, the first underwent early ( t = 0 min, 5 min, 20 min, 24 h) or delayed ( t = 2 wk, 1 month, 3 months, 6 months) substrate aging before bonding and μSBS ( t = 24 h) testing. In the second, adhesive was applied after either early ( t = 5 min) or delayed ( t = 2 wk) substrate aging and then tested after bond aging ( t = 2 wk, 1 month, 3 months, 6 months). The failure modes were identified using stereomicroscope. SEM images of selected samples were analyzed. Results No significant differences were observed between (SE)/(TE) bonding modes ( P = 0.42). With substrate aging, a significant reduction in μSBS occurred between early and delayed time intervals for Biodentine™ ( P = 0.001), but none for the GIC/RM-GIC ( P = 0.465, P = 0.512 respectively). With bond aging, there was no significant difference between time intervals for all groups, except at 6 months for the GIC ( P < 0.05). Modes of failure were primarily cohesive within all the substrates (68.82%) followed by adhesive failure at the resin–substrate interface (21.71%). Significance Biodentine™ is a weak restorative material in its early setting phase. Placing the overlying resin composite as part of the laminate/layered definitive restoration is best delayed for >2 wk to allow sufficient intrinsic maturation to withstand contraction forces from the resin composite. A total-etch or self-etch adhesive may be used.