The Effect of Triple Antibiotic Paste on Bond Strength of Different Root Canal Sealers

Abstract

T he aim of this study was to evaluate the effect of triple antibiotic paste on bond strength of resin based and zinc oxide and eugenol based sealers. A total of forty human single rooted teeth were used in this study. Teeth were decoronated to length 16 mm, cleaned and shaped. Samples were divided into four groups (n=10) according to the type ofintra-canal medication used and type of root canal sealer used. The root were coded and placedin 100% humidity at 37ᴼC for one week to ensure complete setting of the sealers. Bond strength was assessed using the push out test utilizing the universal testing machine. Each root was embedded in acrylic resin inside a plastic syringe which was used as a mold for the acrylic resin, three horizontal sections (coronal, middle and apical) of 2 mm thickness were cutfrom each root. The root slices was secured with sticky wax in a custom made loading fixture. The filling material was subjected to compressive loading ata crosshead speed of 1 mm/min through a computer controlled program.

Load was applied by a flat tip plunger (figure 2) of 1mm diameter for the coronal third slices, 0.7 mm diameter for the middle third slices &0.5 mm for the apical third slices. The plunger tip was sized & positioned to touch only the filling material without stressing the surrounding dentin in an apical coronal direction to push the filling material toward the larger diameter, thus avoiding any limitation to the filling movement possibly owing to the canal taper.The maximum failure load was recorded in N. As regard intra group comparisons, results of this study showed that there was a significant differences in bond strength values recorded at the coronal thirds compared to the middle or apical thirds in group I only, no significant differences were showed in groups II,III and IV (p>0.05). While as regard inter groupcomparisons, results showed that at the coronal third; the lowest mean of recorded bond strength was in group I and this was statistically significant compared to groups II & IV, While the highest mean of recorded bond strength was in group IV followed by group II with no significant differences between them.Whereas differences in canal thirds in groups I, III & IV were non significant (p>0.05).