Material Compatibility of Self-etching Self-cure 1-step Adhesive when Dentin Bonding

Objectives: Determine dentin micro-tensile bond strength (mTBS) of an experimental self-etching, borate-initiated self-curing one-step adhesive system containing self-reinforcing (SR) multi-functional monomer (DBC510) when using direct resin-based composites, resin-based cement and core buildup restorative materials.

 

Methods: DBC510 (DBC, experimental, self-etch self-cure one-step, Tokuyama Dental Corp.) was applied to carbide bur-cut occlusal dentin of 80 human molars using the following restorative materials: Direct Resin-based Composites (6): Estelite Sigma Quick (ESQ, Tokuyama Dental), Estelite Omega (EO, Tokuyama Dental), Esthet X HD (EXH, DENTSPLY CAULK), Herculite Ultra (HU, Kerr), Filtek Supreme Ultra (FSU, 3M) and Venus Diamond (VD, Heraeus Kulzer); Resin Cements (5): ECD-89 (ECD, experimental, Tokuyama Dental), Multilink Automix (MA, IVOCLAR VIVADENT), NX3 (NX, Kerr), CLEARFIL Esthetic Cement (CEC, KURARAY) and Calibra (CA, DENTSPLY); Core Materials (5): ECG (experimental, Tokuyama Dental), Luxa Core Z Dual (LCD, DMG AMERICA), Core-Paste XP (CPX, DenMat), Absolute Dentin (AD, Parkell) and Build IT FR (BIF, Pentron Clinical). The following day the restored teeth were diamond saw sectioned into 2x2mm square sticks then dumbbell shaped specimens (0.5mm² round cross-sectional area, 1mm gage length, 0.6mm radius of curvature) were formed using an ultrafine diamond bur in the CNC Specimen Former (University of Iowa) then tensile-tested at a crosshead speed of 1mm/min in a calibrated materials testing machine (Z2.5, Zwick) using a glue less passive gripping device (Dircks Device). Both ANOVA and Weibull regression models were performed, both ignoring and considering the random effect of the tooth (multiple specimens per tooth) to detect a difference in bond strengths between each restorative material group.

 

Results:

Microtensile bond strength to dentin (MPa (SD))**
Direct RBCs		Resin cements		Core buildups
ESQ	51.0 (9.5)  A	ECD	50.0 (16.4) a	ECG	50.3 (8.5) α
EO	53.5 (11.3) A	MA	51.6 (15.5) a	LCD	48.9 (9.4) α
EXH	56.1 (14.5) A	NX	50.8 (12.4) a	CPX	45.2 (12.7) α
HU	55.7 (16.5) A	CEC	51.1 (17.1) a	AD	50.1 (14.6) α
FSU	62.3 (17.4) A	CA	58.3 (16.8) a	BIF	46.0 (11.9) α
VD	55.3 (17.1) A	-	-	-	-
**means with the same symbol letter are not significantly different using a simple random effect in Mixed Model ANOVA with post-hoc Tukey's test (P > 0.05). n = 20 per group.

Conclusions: No difference in mTBS to dentin was detected when using DBC with any of the restorative material classes.

Acknowledgements: Sponsored by Tokuyama Dental Corp. K. Hirata is employee of Tokuyama.