Keywords : Fissure sealant
Comparison of Tensile Bond Strength Between Fissure Sealants Placed After Rubber Cup Polishing and Air Polishing of Enamel Surface (An in vitro study)
Al-Rafidain Dental Journal,
2021, Volume 21, Issue 1, Pages 124-134
Aims: The purpose of this study is to compare the tensile bond strength between fissure sealants placed after rubber cup pumice polishing and air polishing of the enamel surface. Materials and Methods: An experimental study was carried out using 40 non-carious upper first premolars extracted for an orthodontic reason, the crowns were separated from the roots, the teeth were randomly divided into 2 main groups consisting of 20 crowns depending on the sealant material used (Prevent or Angie), the teeth were subdivided into two subgroups of 10 teeth depending upon whether rubber cup with pumice slurry polishing or air polishing. Group Ia: Prevent Rubber cup (PRC). Group Ib : Prevent Air polisher (PAP), Group IIa: Angie Rubber cup (ARC). Group IIb: Angie Air polisher (AAP). Each tooth in this study was etched with a 37% semi-gel phosphoric acid for 15 seconds on the buccal surface, rinsed thoroughly for 20 seconds, and dried with the air stream to get an uniformly white, chalky-similar appearance. A translucent plastic tube was fixed on an etched enamel surface and filled incrementally with a fissure sealant then ready small post screws with twisted orthodontic wire gauge 0.012 inches which placed inside the tube until the serrations of screws were embedded in the last increment and light-cured. Samples were kept in the distilled water at room temperature for 24 hours. Tensile bond strength was measured by using the universal testing machine (GESTER, GT-C04-2, CHINA) and the values were statistically analyzed using Independent sample t-test. Results: A non-significant difference in tensile bond strength was detected between two methods used in the groups (p>0.05). Conclusions: The air polishing method is easy and useful but, there were no significant differences on the tensile bond strength of material in comparison with a rubber cup and pumice.
Tensile Bond Strength of Self-adhesive Flowable Composite as Pit and Fissure Sealant Bonded to the Enamel Surface in Comparison with Fissure Sealants (in vitro study)
Al-Rafidain Dental Journal,
2021, Volume 21, Issue 1, Pages 135-145
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.
Effect of at Home Dental Bleaching and the Use of Antioxidant on Microleakege of Fissure Sealant : An in Vitro Study
Al-Rafidain Dental Journal,
2012, Volume 12, Issue 1, Pages 102-108
Aim of the study: To evaluate in vitro the microleakage of fissure sealant, the effect of using home bleaching agent containing 18% carbamide peroxide and the effect of ethanol as an antioxidant agent on microleakage. Materials and Methods: Twenty four extracted sound human third molars were randomly assigned to 3 groups. After sealant placement, the teeth were thermocycled (125 cycles; 5- 55°C), isolated, immersed in 0.2% methylene blue dye for 24 hours, included in acrylic resin and sec-tioned longitudinally in a buccolingual direction. The sections were analyzed for leakage using an ste-reomicroscope, and a 4-criteria ranked scale was used to score dye penetration. Results: Microleakage scores increased with significant difference between control and bleached group when home bleach was used for fourteen days, also leakage scores decreased with significant difference when ethanol was used after bleaching to reverse the oxidation process, no significant difference was observed between control versus ethanol group. Conclusions: Microleakage scores increased after bleaching because of reduction in enamel bond strength of sealant when the bonding procedure was carried out immediately after bleaching, use of ethanol or other types of antioxidant reduced the amount of microleakage sig-nificantly.