The influence of two chelating agents used in two different working times on the microleakage of packable composite resin used in post space (in vitro study)

J. Al-Azzawi, Haitham; J. Abdul-Wahed, Hassan

	The influence of two chelating agents used in two different working times on the microleakage of packable composite resin used in post space (in vitro study)
Journal of baghdad college of dentistry
Article 1, Volume 21, Issue 4, 2009, Pages 6-9
Authors
Haitham J. Al-Azzawi; Hassan J. Abdul-Wahed
Abstract
ABSTRACTBackground: Weakened teeth are not strengthened by the placement of a post but retention of restoration isenhanced by using a post. Restoration with adhesive materials offers many advantages over the use of traditionalmaterials, like transmission of functional stresses across the bonded interface to the peridontium, with potential toreinforce the weakened tooth structure. Cavity preparation and root canal instrumentation leave a layer of debristhat covers the walls of the cavity and root canal, known as smear which can be removed with a chelating agent.This in vitro study conducted to evaluate the effect of two different chelating agents used in two different times ofapplication on the microleakage of packable composite resin (Filtek P60 shade) used in post space.Materials and method: Fifty, human, freshly-extracted mandibular premolars were selected. After crown sectioningand conventional endodontic treatment, parallel post spaces 5mm in depth and 2mm in diameter were preparedusing pesso burs (LARGO No.6). Then the specimens were randomly divided into five groups as follow: Group1(control): The post space was filled with packable composite without previous using of chelating agent. Group2(experimental): The post space was flooded with 17% EDTA for 5 minutes prior filling with packable composite.Group3 (experimental): The post space was flooded with 10% citric acid for 5 minutes prior filling with packablecomposite. Group4 (experimental): The post space was flooded with 17% EDTA for 10 minutes prior filling withpackable composite. Group5 (experimental): The post space was flooded with 10% citric acid for 10 minutes priorfilling with packable composite. After thermocycling and immersion in methylene blue, the teeth were sectionedlongitudinally and dye penetration was evaluated using a stereomicrscope, microleakage was recorded in mm.Results: ANOVA test and least significant difference (LSD) test were used to analyze the results and to show thedifference between groups. Results expressed statistically highly significant reduction in microleakage value amongall groups; with the lowest mean microleakage value was in group5 in which citric acid was used for 10 min.,followed by group4 in which EDTA was used for 10 min., followed by group3 in which citric acid was used for 5 min.,followed by group2 in which EDTA was used for 5 min., and control group showed the highest microleakage value.Conclusion: From the results of the present study, it is clear that the application of a chelating agent prior using acidetch and adhesive system with composite resin filling material will significantly reduce microleakage value of therestorative material.Key words: Microleakage, Packable composite, Post, Chelating agent. (J Bagh Coll Dentistry 2009; 21(4): 6-9)

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