Abstract
Aims: The objectives of this study to compare the tensile bond strength (TBS) of self-adhesive Flowable composite with conventional fissure sealants. Materials and Methods : an experimental study was carried out using forty non-carious upper first premolars that were collected of orthodontic extracted teeth. The crowns separated from the roots and the buccal surface were cleaned and polished to obtain a clean enamel surface. The samples were randomly divided into 4 main groups according to the types of resin material (n:10 for each group). Group I: testing TBS for Vertise Flow, Group II: testing TBS for Prevent, Group III: testing TBS for Angie, Group IV: testing TBS for Conseal. A translucent plastic tube was fixed after acid etching application on enamel surface for 15 seconds followed by water rinsed and air dryness, the tube filled incrementally with flowable resin and fissure sealant then ready small post screws with twisted orthodontic wire gauge 0.012 inch which placed inside the tube until the serrations of the screws were embedded in the last increment and light-cured. The Samples were stored in the distilled water at room temperature for 24 hours. Tensile bond strength was measured using a universal testing machine (Electronic Elastic Strength Tester GT-C04-2, GESTER, CHINA).The values were statistically analyzed using one way ANOVA and Duncan tests. Results : A significant difference in the tensile bond strength were observed among all groups (p<0.05). Vertise Flow showed higher tensile bond strength value than fissure sealants followed by Prevent , Angie and Conseal. Conclusions: The tensile bond strength of Vertise Flow better than the fissure sealant due to the presence bond (Optibond) with etchant properties.
Highlights
Pits and fissures are represented as malformations in cuspal odontogenesis, and considered as the main reason for developing occlusal caries
The clinical efficiency of fissure sealants is depending on their retention and the retention level of a pit and fissure sealant depends on the micro-mechanical bond between the enamel surface and sealant material(4)
Glycerol-phosphate Dimetracrylate (GPDM) is probably the most functional factor in Vertise Flow where it has proven good adhesive performance in both laboratory and clinical research.(16) concurrence between bond strength and curing stress is decreased as the viscous elastic flow occurs at the same time as the bonding manner, This finding was supported by Juloski et al, 2012 (17)
Summary
Pits and fissures are represented as malformations in cuspal odontogenesis, and considered as the main reason for developing occlusal caries. Conventional resin-based fissure sealants are not self-adhering so that, the surface area of teeth must be modified or etched by acids(5). The conventional fissure sealant may need bond placement before sealant application to improve bonding strength, it is known that enamel bonding is accomplished by the formation of resin tags in etched enamel to create micromechanical interlocking(23)(12). To get rid of these problems, a self-adhering resin(SAR) based fissure sealants were developed. The resin in these fissure sealants is a self-adhesive flowable composite that’s used in the restoration of small Class one caries , Class five carious lesion, and non-carious lesions and the application is simple and non-difficult, and the surface area may do not need previous acid etching or bond placement with high enamel bonding property(7)(19). The null hypothesis test was that there were non-significant differences in the bond strength between tested materials
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