| 0452 Removal of Eugenol-Containing Endodontic Sealer Prior to Dentin Bonding | ||
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N. TAYLOR1, C.G. STEPHEN-HASSARD1, J. MINCHAU1, and J.R. HOBBS2, 1West Virginia University School of Dentistry, Morgantown, USA, 2West Virginia University, Morgantown, USA The use of a resin to immediately seal the canals of an endodontically treated tooth may increase the success of treatment. Eugenol-based sealers have a history of success in root canal therapy and are used quite often, but are known to inhibit polymerization of composite resins. Wolanek et.al (J. Endodontics 27, 354-357, 2001) found that cleaning the pulp chamber with chloroform prior to bonding will eliminate the inhibitory effects of the eugenol-based sealer; however, chloroform is both toxic to the tissues and potentially carcinogenic. Objectives: This study was designed to determine if residual eugenol-containing endodontic sealer could be removed by preparing the pulpal chamber with 34% phosphoric acid gel or isopropyl alcohol prior to bonding. Methods: Seventy single-canaled, extracted teeth were opened via standard access preparations and shaped using gates-glidden drills. Each canal was obturated with gutta percha and a eugenol-based sealer. After obturation 60 teeth were randomly assigned to three groups. Each tooth was treated with a one-step DBA and sealed with flowable composite. Prior to bonding, the chambers were prepared using three techniques: group one was wiped clean of visible sealer with a dry cotton pellet; group two was etched with 34% H3PO4; group three was wiped with an isopropyl alcohol soaked pellet. The specimen were then thermocycled and stained. The teeth were demineralized, dehydrated, and cleared so leakage could be visualized. Positive and negative control groups containing five teeth each behaved as expected. The data were analyzed using both a Chi-Square and Fisher's Exact tests. Results: No statistical significance existed between the microleakage of groups one and two (p > .05). However, group 3 exhibited significantly less microleakage than both groups one and two (p < .05). Conclusion: This study indicates that preparing the pulpal chamber with isopropyl alcohol prior to resin bonding will decrease coronal leakage. | ||
| Seq #79 - Effects of Agents and Contamination 2:00 PM-4:00 PM, Thursday, 10 March 2005 Baltimore Convention Center Exhibit Hall E-F | ||
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