Objectives: Dual cured composite resin core build-up material requires the use of a dual cured or self cured adhesive. We developed a new dual cured adhesive containing a borate derivative that enhances bonding to teeth substrate. The purpose of this study is to evaluate the tensile bond strength of a dual cured resin core material to dentin using a newly developed dual cured adhesive system.
Methods: Dual cured resin composite was bonded to bovine tooth which were ground with 600-grit SiC paper under running water to expose the dentin surfaces using three different adhesives; DBO: dual cured adhesive containing a borate derivative, DBP: dual cured adhesive containing a benzoyl peroxide (BPO), DC: adhesive containing no self cure initiator. Samples treated with light irradiation (Light cure mode) or chemically cured (Self cure mode). The tensile bond strengths of the samples were measured after immersion in water at 37oC for one day.
Results: The results are shown in the table. The bond strength of the sample treated by the newly developed adhesive containing borate as an initiator (DBO) was significantly higher than DBP and DC.
Adhesive | Tensile bond strength / MPa(SD) | |
Light cure mode | Self cure mode | |
DBO | 25.3 (1.6) | 21.3 (1.9) |
DBP | 21.5 (6.9) | 3.5 (1.0) |
DC | 20.4 (7.0) | 0.0 (0) |
Conclusion: The borate derivative greatly improves the adhesive ability of the self cure mode of the dual cured adhesive.