Aim:The aim of this in vitro study was to evaluate if there is any significant difference in apical leakage when gutta-percha is removed immediately after obturation for postspace preparation or after a week.
Materials and methods:Two commonly used sealers AH26 and tubliseal were used in four groups each consisting of 20 teeth each. The tooth was sectioned at the amelocemental junction to leave a root portion of 12 to 14 mm. Canals were checked for patency and prepared to No-55 K file size. Two people, using a stereomicroscope, independently evaluated each tooth-half for the extent of apical leakage.
Results:The leakage results were analyzed using a one-way ANOVA according to present study, immediate postpreparation is preferable than delayed postpreparation. The relationship of in vitro leakage measurements to the in vivo situation has not been established.Clinical implication: Hence, immediate postpreparation is preferable than delayed postpreparation.
To produce good adhesion between composite resin and etched enamel surface, it is necessary to form a microscopically intimate contact between them. Contaminants, like saliva, may interfere with such bonding. Salivary contamination may reduce the bond strength between composite resin and the enamel by 40 to 60%. Recent studies have suggested that only rewashing and drying of the etched and saliva contaminated enamel surface is sufficient in restoring bond strength to the normal ideal condition.
Purpose:To evaluate the effect of saliva contamination on the shear bond strength of composite resin to enamel by using different parameters.
Materials and methods:The highest mean shear bond strength of composite resin was obtained on the uncontaminated enamel surface, and the lowest mean shear bond strength was obtained on the saliva contaminated moist enamel surface.
Results:The mean shear bond strength of composite resin to saliva contaminated, washed and air-dried enamel surface was less than the mean shear bond strength to the dry enamel surface.
Conclusion:This suggests that only rewashing of the saliva contaminated enamel surface is not enough in achieving bond strength equal to that of the uncontaminated enamel surface.
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