Effect of collagen cross-linkers on the shear bond strength of a self-etch adhesive system to deep dentin

Abstract

Objectives:To evaluate the shear bond strength of composite resin to deep dentin, bonded using a self-etch adhesive, after treatment with two collagen cross-linkers at varying time intervals.Materials and Methods:Thirty extracted human incisors were sectioned longitudinally into equal mesial and distal halves (n = 60). The proximal deep dentin was exposed and the specimens were divided based on the surface treatment of dentin prior to bonding as follows: Group I (n = 12, control): No prior dentin surface treatment; group II (n = 24): Dentin surface pretreated with 10% sodium ascorbate; and group III (n = 24): Dentin surface pretreated with 6.5% proanthocyanidin. Groups II and III were further divided into two subgroups based on the pre-treatment time of five and 10 min. Shear bond strength of the specimens was tested using universal testing machine and the data were statistically analyzed.Results:Significantly higher shear bond strength to deep dentin was observed in teeth treated with 10% sodium ascorbate and 6.5% proanthocyanidin compared to control group. No significant difference was observed between 5 min and 10 min pre-treatment times.Conclusion:Dentin surface pre-treatment with both 10% sodium ascorbate and 6.5% proanthocyanidin resulted in significant improvement in bond strength of self-etch adhesive to deep dentin.

Comparative evaluation of chlorhexidine, grape seed extract, riboflavin/chitosan modification on microtensile bond strength of composite resin to dentin after polymerase chain reaction thermocycling: An in vitro study

“…Group III (6.5% GSE) showed significantly higher bond strength to dentin compared with Groups I and IV ( P < 0.001). This is in accordance with the findings of Srinivasulu et al .,[ 3 ] who showed that the application of 6.5% GSE to deep dentin significantly improved the shear bond strength values of composite to dentin compared with the use of 10% sodium ascorbate. The increase in bond strength may be due to the greater number of collagen cross-links which improved collagen stability.…”

“…The major limitations of dentin as a bonding substrate are its heterogeneous composition and hydrophilic nature. [ 3 ]…”

Interfacial fracture toughness of universal adhesive systems treated with an antioxidant

“…Naturally occurring collagen cross-linkers such as sodium ascorbate and proanthocyanidin have been reported to increase the collagen cross-linking in the sound and caries-affected dentin ( 9 , 10 ). The positive effect of these collagen cross-linkers on the bond strength of a self-etch adhesive to deep dentin has been reported in the literature ( 7 ). Also, it seems that the efficacy of antioxidant depends on the type of adhesive system ( 11 ).…”

“…The durability of the bond between dentin and the adhesive system depends largely on the structural integrity and mechanical properties of acid-demineralized collagen fibers ( 6 ). Covalent inter- and intra-molecular cross-links are the basis for stability, tensile strength and viscoelasticity of collagen fibrils ( 7 ).…”

Evaluation of grape seed extract (Vitis vinifera) as a crosslinker on the stability of dentine collagen in total-etch adhesive systems: An in-vitro study

“…The mechanical properties of collagen and its resistance to enzymatic degradation can be increased by increasing intra-cross and molecular formation. This can be achieved by using synthetic and natural collagen cross-linker in the dentine substrate before bonding procedures (Vidhya et al, 2013). The use of collagen cross-linking agent is proposed to improve the mechanical prop-erties of the dentine matrix, reduce the level of biodegradation of collagen, increase the nature of dentine resin bonding, and extend the life of adhesive restoration (Castellan et al, 2013).…”