Effect of using Different Remineralizing Agents on Micro-shear Bond Strength of Nanohybrid Composite Resin

Abstract

<jats:p>AIM: This study was conducted to evaluate the effect of different remineralizing agents on micro-shear bond strength (SBS) of nanohybrid composite resin to dentin.&#x0D; METHODS: Thirty-six human molars were divided into four main equal groups (nine teeth each) according to the type of remineralizing agent used; nanohydroxyapatite, sodium fluoride, fluorohydroxyapatite, and control without remineralizing agent. Each group was divided into three equal subgroups (three teeth each) according to the storage time; 1 day, 1 month, and 3 months. Specially fabricated cylindrical plastic mold was made, and teeth were embedded vertically in the mold to the level of cementoenamel junction of the tooth leaving the occlusal surface projecting above the surface of the mold. Cylindrical fissure carbide bur was used in teeth preparation. Teeth were trimmed perpendicular to the long axes of them. Demineralizing agents (Nano hydroxyapatite, sodium fluoride, and fluorohydroxyapatite) were applied then adhesive system applied then composite resin was applied using five sections of a pediatric intravenous tube to act as molds for composite specimen then the specimens stored in artificial saliva at 37°C for different storage times in an incubator. The micro-SBS was assessed using universal testing machine. Then, the mode of failure for each group was determined using stereomicroscope device. Then, the obtained data were tabulated and statistically analyzed. One-way ANOVA was used to compare between more than two non-related samples. The significance level was set at p ≤ 0.05. Statistical analysis was performed with IBM SPSS Statistics.&#x0D; RESULTS: There was statistically significant difference between the four studied groups regarding bond strength at different storage times. Fluorohydroxyapatite had the highest bond strength mean values followed by nanohydroxyapatite, while the lowest value was the sodium fluoride group.&#x0D; CONCLUSION: Fluorohydroxyapatite and nanohydroxyapatite had a positive effect on micro-SBS to dentin, but sodium fluoride had a negative effect. The storage time increase had a positive effect on the micro-SBS of dentin with fluorohydroxyapatite and nanohydroxyapatite, also it had adverse effect on the dentin bond strength with sodium fluoride and control groups.</jats:p>

Caries-affected dentin remineralization using Natural marine-based gels

“…These results were agreed upon with the EDX evaluation of the present study and observed under the FESEM, showing deposition of minerals which might act as receptors for chemical bonding with the 10-MDP present in the ALL Bond universal adhesive enhancing the bond strength of resin composite which was in accordance with Zhou et al [17] . These results were in agreement with Rabee et al [19] , Alagha [20] who found that the remineralization of the CAD improved the shear bond strength of dentin, meanwhile they used fluorohydroxyapatite and nanohydroxyapatite, also Kamozaki et al [21] study was in agreement with the present study, but with using CPP-ACP as a remineralizing material. Cao et al [22] ; Rahiotis and Vougiouklakis [23] assumed that the calcium and phosphate ions from the remineralizing materials diffuse in the porous lesion and deposit in the partially demineralized crystals, building the hydroxyapatite crystals, as well as Yoshida et al [24] results were in agreement with the results of the current study.…”

Evaluation of the effect of remineralization with strontium-doped nanohydroxyapatite with noncollagenous protein analog: Chitosan on the shear bond strength of resin composite to dentin – An in vitro study

“…This is in agreement with the study by Alagaha stating that the frequency of the cohesive and mixed failure increase with fluorohydroxyapatite and nanohydroxyapatite than adhesive failure when the mode of failure pattern was assessed after 3 months for the microshear bond strength. [ 11 ] Furthermore, similar results were found in a study by Kudva et al ., in which the main type of failure observed was cohesive in biodentine, and it is also stated that if the predominant failure should be cohesive, followed by mixed and adhesive. [ 22 ]…”

“…In the ratio of 1:2, powder and liquid were mixed and applied on the dentin surface for 2 min, gently agitated, and rinsed off and dried with tissue paper. [ 11 ]…”