Purpose: This study aimed to compare the effect of two anticollagenolytic agents, chlorohexidine and Aloe vera on dentin microhardness and their effect as pretreatments on the remineralization potential of CPP-ACFP. Materials and Methods: For this study, 40 extracted sound human premolars were subjected to artificial erosion and randomly divided to two equal groups (20 premolars each) according to immersion in the tested anticollagenolytic agents (A); group (A 1) Aloe vera and group (A 2) Chlorhexidine. Each group was further subdivided into two equal subgroups (10 premolars each) according to microhardness measurement (B); group (B 1): before CPP-ACFP application and group (B 2): after CPP-ACFP application. Results: Results showed no statistically significant difference between Aloe-Vera and CHX; both statistically increased dentin microhardness. After immersion, AFCP showed statistically significantly higher mean microhardness than no AFCP application (P-value = 0.003) for Aloe vera and (P-value = 0.012) for CHX. Conclusion: Aloe vera and CPP-ACFP produced synergistic effect for enhancing dentin remineralization in erosive lesions.
Objective Bonding to different dentin substrates influences resin composite restoration outcomes. This study investigated the influence of different adhesion protocols on the shear bond strength of universal adhesive systems to sound and artificial caries-affected dentin (CAD). Materials and Methods Occlusal enamel of 80 premolars were wet grinded to obtain flat midcoronal dentin. Specimens were equally divided according to the substrate condition: sound and CAD by subjecting to pH-cycling for 14 days. Each dentin substrate was bonded with the adhesive systems used in this study: Single Bond universal adhesive or Prime&Bond universal (applied either in etch-and-rinse or self-etch adhesion protocol). Adhesive systems were utilized according to manufacturers’ instructions, then resin composite was built up. Specimens were tested for shear bond strength. The data were analyzed by three-way analysis of variance, and failure modes were determined using stereomicroscope. Results There was no statistically significant difference between the two tested adhesive systems on artificially created CAD with different adhesion protocols. On sound dentin, Single Bond universal, either in the etch-and-rinse or self-etch adhesion protocols, revealed higher statistically significant shear bond strength mean values compared with CAD. Conclusion Single Bond universal adhesive in an etch-and-rinse adhesion protocol improved only bonding to sound dentin, while no added positive effect for the etching step with Prime&Bond universal adhesive was found when bonded to both sound and CAD substrates. The influence of CAD on the performance of the universal adhesives was material-dependent.
Objective: this study was carried out to assess the effect of different caries prevention protocols on salivary flow in high caries risk patients. Materials and methods: 66 participants were involved in the study (n=22). All of them were considered as high-risk participants. They were randomly divided into three groups according to a proposed caries management system. Group one (I1) received personalized caries management system. Group two (I2) received a combined therapy of chlorhexidine and fluoride mouthwash. Group three (I0) received standard preventive measures (control group). Results: Chi-square test showed that there was no statistically significant difference in the saliva score at baseline between all groups (p>0.05). After one year Chi-square test also showed no statistically significant difference between all groups (p>0.05). Conclusions: No measurable effect was observed for any of the study groups on the salivary flow rate.
Purpose:The aim of this study was to examine the shear bond strength (SBS) of conventional glass ionomer incorporated (GI) with flax fibers and/or ethanolic extract of propolis (EEP) with and without thermo-cycling. Materials and Methods: We used 40 extracted sound molars were used in the present study and divided into four equal groups: Group (GI) conventional glass ionomer(control), Group(F)GI incorporated with 5% flax fibers, Group (P) GI incorporated with 1% ethanolic extract of propolis (EEP), Group (FP) GI incorporated with 5% flax fibers and 1% ethanolic extract of propolis (EEP). All samples were prepared for shear bond strength assessment before and after thermocycling. Results: Showed that (F),(P) and(FP) groups had statistically significant highest median shear bond strength values before thermo-cycling in comparison to GI group. While (FP) group had the statistically significant highest median shear bond strength (SBS) after thermocycling. Conclusion:5% Flax fibers and 1% ethanolic extract of propolis (EEP)improved the shear bond strength of conventional glass ionomer.
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