The aim of this study was to evaluate the marginal integrity of a solvent-free one-step self-etch adhesive (Bond 1SF) and to compare it with ethanol-water based adhesive (Single Bond Universal (SB)) and acetone-water based adhesive (G-aenial Bond (GB)), at different storage times. Class V cavities (2×3.5×2.5 mm) were prepared on the buccal aspects of 90 human molars. The adhesives were applied to the cavities then the specimens were restored with A2 shade of Z250XT composite resin. Each group was evaluated for dye penetration under a stereomicroscope at X32 after one day, one month, and six months. Statistical analyses were carried out. In addition, in each experimental group, one specimen were prepared for analysis under SEM. Results: There were a significant differences in microleakage between the three adhesives at one day, Bond 1SF (B1SF) was the highest one. Whereas, there were no significant differences at six months. There were a significant differences in microleakage between the occlusal and gingival margin microleakage. Gingival margin microleakage was higher than that of occlusal margin. Conclusion: Storage time has adverse effect on the marginal integrity of solvent containing one-step self-etch adhesive while has no adverse effect on one-step solvent-free self-etch adhesive, microleakage increase obviously at the gingival margin, the type of solvent has a positive effect on the marginal integrity, ethanol-water based one step self-etch adhesives showed superior marginal integrity (2662)
Aim: To evaluate the effect of hydro abrasion versus the conventional drill method of cavity preparation on the clinical performance of composite restoration over one year follow up period. Materials and methods:Twenty patients with occlusal carious lesions were selected and examined with DIAGNO cam and ICDAS visual criteria to select teeth having ICDAS Code 3 or 4. Forty lesions were randomly divided into two groups (n=20) according to the method of caries removal. Cavities were prepared by the conventional drill method in group I and by hydro-abrasion in group II. Cavities of both groups were restored by self-etch adhesive (Adper Easy Bond) and nano-filled composite (Filtek Z350XT). All restorations were evaluated after 24 hours, after 9 and 12 months according to (USPHS) criteria for retention, marginal adaptation, postoperative sensitivity, marginal discoloration, and secondary caries.Results: Mild, moderate -severe and very severe pain was recorded in group I While in group II, only mild pain was recorded in (40%) of cases. The statistical analysis of the collected data related to the tested USPHS criteria revealed 100% Alpha scoring regarding retention, marginal adaptation and secondary caries in both groups throughout the study period. The gap width measured under SEM was found increased sig. by time in both groups. Marginal discoloration was observed in the two groups after nine and 12 months. Post-operative hypersensitivity was found only in group I in 100% of cases at the base line and was disappeared during the next follow up period. Conclusion:Hydro-abrasion could be recommended as a preferred method of cavity preparation in shallow to mild carious lesions compared to the conventional cavity preparation method.
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