![]() 3 In studies performed at the University of North Carolina, the gutta-percha test group demonstrated leakage in 80% of specimens regardless of the obturation technique or which sealer was used. Upon setting, shrinkage of the sealer allows the sealer to pull away from the gutta-percha core, leaving a microgap through which bacteria may pass. Although sealers can form close adhesion to the root canal wall, none is able to bond to the gutta-percha core material. ![]() ![]() Gutta-percha has limitations in its resistance to coronal leakage, which have been overcome with the newer resin alternatives. But use of an adhesive sealer can significantly slow or stop coronal-apical bacterial migration. 1 Studies using gutta-percha and various sealers indicate that gutta-percha will consistently allow bacterial leakage. Research has demonstrated that when exposed to artificial and natural saliva for as little as 2 days, a root canal filling will have leakage and bacterial contamination to the root apex. Microleakage continues to be a main reason for the failure of root canal therapy, where the challenge has been to achieve an adequate seal between the internal tooth structure and the main obturation material.Ĭoronal leakage for even a minimal amount of time may quickly lead to apical migration of bacteria. When the coronal portion of the tooth is not sealed with a restorative material that resists microleakage, the tooth is at risk of bacterial infiltration and failure of the endodontic filling. LeakageĬoronal leakage has been indicated as a major determinant of endodontic success or failure. This application is available as Innuendo (Heraeus Kulzer, Armonk, NY). Resilon is also available as a terminus on a fiber obturator that allows one to obturate the canal and place a fiber post simultaneously with a methacrylate sealer. Presently, alternatives to Resilon available on the market consist of resin-coated gutta-percha cones (EndoRez cones) Resilon is the only solid resin cone being offered at this time. Another product falling into this category of methacrylate sealers is EndoRez (Ultradent, South Jordan, UT). Several studies have used a methacrylate resin sealer, such as Epiphany (Pentron Clinical Technologies)-which is also sold as RealSeal, (SybronEndo, Orange, CA) as a sealer system with Resilon as the core obturation material. Resilon is a core obturation material alternative to gutta-percha and requires a sealer to complete obturation of the canal system. This article addresses the concerns and discusses some of the literature that has been published on Resilon. In the meantime, the literature has been filled with numerous peer-reviewed articles reporting on many aspects involving Resilon. ![]() When Resilon (Pentron® Clinical Technologies, LLC, Wallingford, CT) was introduced 4 years ago, much concern was expressed for this obturation material, ranging from how would it geometrically fill canals compared to gutta-percha to whether it could provide a seal equal to zinc oxide/eugenol (ZOE) or AH-26 (epoxy resin root canal sealer). These sealers to be used with gutta-percha have included calcium hydroxides, zinc-oxide and eugenol cements, and glass ionomer cements. After the instrumentation and irrigation of debris from the canal is complete, the root canal is filled with gutta-percha inserted with an endodontic sealer. Traditionally, endodontic treatment requires instrumentation of the root canal to remove infectious debris, leaving clean canal walls.
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