Immediate Bond Strengths to Gluma Power Gel-treated Dentin

Objectives: To evaluate the effects of Gluma Power Gel on bond strengths of etch-and-rinse and self-etch adhesives to dentin. 

Methods: Occlusal surfaces of human molars were ground with 600-grit silicon carbide paper to obtain flat dentin.  For etch-and-rinse adhesive groups, dentin surfaces were conditioned with phosphoric acid prior to application of Gluma Power Gel, Gluma Desensitizer, HemaSeal & Cide, HurriSeal, MicroPrime B, or MicroPrime G.  Etch-and-rinse adhesives tested were iBond Total Etch, ExciTE F, OptiBond Solo Plus, and Prime & Bond NT.  The one-step self-etch adhesives Adper Prompt L-Pop and Xeno IV also were evaluated.  All materials were applied following manufacturers’ instructions.  Venus Diamond composite build-ups were placed and specimens stored in distilled water at 37°C.  After 24 h, specimens were sectioned into beams and tested in microtensile bond strength (MTBS).  Data were analyzed using factorial analysis of variance (SAS 9.2vers). Level of significance was set at 0.05.

Results: For etch-and-rinse systems, mean MTBS ranged from 20.0 MPa when iBond Total Etch was used with Gluma Power Gel to 46.6 MPa when ExciTE F was used with HemaSeal & Cide.  These were similar to the results obtained with one-step self-etch adhesives, which had means ranging from 22.0 MPa (Adper Prompt L-Pop, control) to 37.0 MPa (Adper Prompt L-Pop, MicroPrime G).The main factors (adhesive, desensitizer) and pairwise interaction effects were not statistically significant (P>0.25).

Conclusions: Gluma Power Gel has no adverse effect, on average, on the bonding of the tested etch-and-rinse and self-etch adhesives to dentin.  This study was supported by Heraeus Kulzer.