Dentin bond strength of a new adhesive system containing calcium phosphate experimentally developed for direct pulp capping

Abstract

The purpose of this study was to evaluate the microtensile bond strength (µTBS) to human dentin of an experimental bonding agent containing calcium phosphates experimentally developed for direct pulp capping. Different concentrations of four types of calcium phosphates were added to an experimental bonding monomer, and six experimental bonding agents were thus prepared. Clearfil SE Bond/Bond was used as the control. Flat dentin surfaces of human molars were assigned to the experimental adhesive systems and the control. After Clearfil SE Bond/Primer was applied to the dentin surface, each experimental bonding agent was applied and photopolymerized, and then a resin composite paste was placed and photopolymerized. The specimens were subjected to µTBS testing. Results revealed that there were no significant differences among the µTBS values of the experimental bonding agents and the control. In other words, the calcium phosphate-containing experimental adhesives did not adversely affect the µTBS to dentin.

Effect of the concentrations of calcium chloride and synthetic peptides in primers on dentin bond strength of an experimental adhesive system

“…In the present study, the MTBS values of Groups 1 and 2 -in which 10% NaClO was applied on the dentin surface-were almost equal to that of the positive control group in which NaClO was not applied. The results hereby obtained thus confirmed that dentin surface pretreatment with 10% NaClO did not affect the dentin bond strength of the experimental adhesive system, a finding consistent with that of our previous study 14) .…”

“…It was thus speculated that pA/pB might have the ability of establishing chemical bonding with superficial dentin matrix, because DMP1 is an acidic protein that binds to calcium ions and initiates mineral deposition. Further on bonding efficacy to dentin, this study showed that the addition of 10 wt% hydroxyapatite to the bonding agent did not significantly reduce the MTBS of the experimental adhesive system to dentin, a finding consistent with that of our previous study 14) .…”

“…Despite being a laudable promoter of dentin bridge formation, there existed a concern that the inclusion of calcium phosphate powder in adhesives might lead to reduced bond strength with the tooth structure. To address this concern, we examined the microtensile bond strength (MTBS) of the experimental, calcium phosphate-containing, direct pulp capping adhesive systems to human dentin 14) . Results revealed that the addition of calcium phosphate to experimental adhesives did not adversely affect the MTBS to dentin 14) .…”

“…To address this concern, we examined the microtensile bond strength (MTBS) of the experimental, calcium phosphate-containing, direct pulp capping adhesive systems to human dentin 14) . Results revealed that the addition of calcium phosphate to experimental adhesives did not adversely affect the MTBS to dentin 14) . Another candidate that seemed to be a promising promoter of reparative dentin formation is dentin matrix protein 1 (DMP1), an acidic phosphoprotein initially detected in dentin and later in other mineralized tissues including cementum and bone.…”

The effect of different ratios of nano‐sized hydroxyapatite fillers on the micro‐tensile bond strength of an adhesive resin

“…In a similar manner, Garcia, Leitune, Samuel, and Collares (2017) did not report any difference between their control and 2% HA groups in their study, which evaluated the immediate bond strength. Shinkai et al (2009) also reported that there was no significant difference in the immediate bond strength values between the 5% HA and the control groups. Although Leitune et al (2013) investigated the immediate bond strength and obtained the best μTBS values for the 2% HA group, they found no statistically significant difference among the 2% and 5% HA groups.…”