The Effect of Simplified Adhesives on the Bond Strength to Dentin of Dual-cure Resin Cements

Abstract

The purpose of this study was to compare the shear bond strengths to dentin of two dual-cure resin cements, one with a unique initiator, NX3 (Kerr Corp), and the other with a traditional redox-initiator system, Calibra (Dentsply), when used in combination with simplified or nonsimplified adhesive agents. The two dual-cure resin cements, in either self- or dual-cure activation modes, were bonded to human dentin with four dental adhesives to create 16 subgroups of 10 specimens each. After 24 hours of storage in distilled water at 37°C, the specimens were tested in shear in a universal testing machine. With both NX3 and Calibra, bond strengths significantly increased when the specimens were dual cured. In addition, with either cement in either mode, the nonsimplified adhesives performed significantly better than did the simplified adhesive bonding agents. When used specifically with simplified adhesives in either cure mode, NX3 did not produce significantly higher bond strengths than did Calibra. In general, lower dentin bond strengths were found with simplified adhesives or self-cure activation with either resin cement.

Degree of conversion and depth of cure of Ivocerin containing photo-polymerized resin luting cement in comparison to conventional luting agents

“…A plausible reason for better result of NX3 is the redox initiator system which is free from tertiary amine and benzoyl peroxide. 21 This redox initiator system resolves incompatibility issues with acidic adhesives, making NX3 compatible with total and self-etch adhesives. 22 Furthermore, Calibra and Variolink-N samples showed significantly lower degree of conversion compared to NX3 and Variolink-E. A conceivable clarification for this outcome may be related to the instability of Benzoyl peroxide (BPO) and tertiary amine as initiator in these dual cure cements.…”

Color stability and degree of conversion of a novel dibenzoyl germanium derivative containing photo-polymerized resin luting cement

“…A possible explanation for the latter results may be that NX3 has a redox initiator system, which lacks both a tertiary amine and benzoyl peroxide. 15,35 Redox initiators are also compatible with acidic adhesives, thereby making NX3 compatible with total and self-etch adhesives. 35 The low DC observed for Variolink-N and Calibra compared to Variolink-E and NX3 may also be associated with the instability of these dual cure cements due to the presence of tertiary amines and benzoyl peroxide as initiators.…”

“…15,35 Redox initiators are also compatible with acidic adhesives, thereby making NX3 compatible with total and self-etch adhesives. 35 The low DC observed for Variolink-N and Calibra compared to Variolink-E and NX3 may also be associated with the instability of these dual cure cements due to the presence of tertiary amines and benzoyl peroxide as initiators. 15,36 To compare the color stability of the four luting cements in the present study, spectrophotometry with the CIE L* a* b* system and a color difference formula was employed.…”

Dentin bond strength of bioactive cement in comparison to conventional resin cement when photosensitized with Er,Cr:YSGG Laser

“…A possible explanation for high SBS scores in these two groups can be attributed to the presence of silane coupling agent (BISGMA) in C and (UDMA) and (TEGDMA) in V cements which might have improved dentine adhesion. 17 Secondly, the adhesive system used in the present study was Tetric N Bond i.e., (fifth generation bonding agent) which is ethanol based containing small amount of water. 18 The extrinsic water in adhesive agent along with intrinsic moisture during photo ablation of dentine surface with laser, caused rehydration of the dentinal collapsed collagen matrix hence improving bond integrity.…”