Objectives: The purpose of this study was to evaluate tensile bond strengths (TBS) of a novel resin cement to resin-coated dentin.
Methods: Flattened dentin surfaces (#180) of bovine teeth (n=30) were coated with a self-etching adhesive (Brush&BondTM [B&B], Parkell). Non-coated dentin specimens were used as a control group (n=10). Oxygen inhibited layer on the coated surface was removed with an ethanol containing cotton pellet and covered with a temporary sealing material (Caviton, GC). Caviton was removed after one-week storage in 37 oC water, and then a novel adhesive cement (SEcureTM, Parkell) was applied to the surface (4.8mm diameter) with and without a pretreatment of B&B or SEcure primer. The TBS was measured at a 2mm/min crosshead speed after 24 hours storage in 37 oC water. Data were statistically analyzed by one-way ANOVA and Tukey's test. (p=0.05, n=10).
Results: The results (Table below) showed that the TBS of SEcure to the resin-coated dentin without pretreatment was significantly lower than that of the control (p<0.05). Both of B&B pretreatment with photo irradiation and SEcure primer pretreatment were significantly effective to increase the TBS to resin-coated dentin (p<0.05). The improved TBS values were not significantly different with the value of the control.
Conclusion: It was concluded that the pretreatment using B&B or SEcure primer was essential to improve the bond strengths of SEcure to resin-coated dentin surface.
Table1. Results of TBS (mean ± s.d.)
Tested groups | TBS (MPa) |
No resin coating (control) | 7.7 ± 2.8a |
No pretreatment | 2.3 ± 0.5b |
SEcure primer pretreatment | 7.9 ± 3.1a |
B&B pretreatment with photo irradiation | 9.4 ± 2.2a |
Values with identical letters indicate no significant difference (p>0.05).