And, in an earlier study we found both thermoplasticized gutta-percha selleck compound techniques Thermafil and Ultrafil to be superior to lateral condensation.6, 7 Another coated carrier system, Soft Core (Soft Core System, Copenhagen, Denmark) has recently been introduced. The Soft-Core obturators consist of biocompatible plastic posts, available in ISO standard sizes and coated with thermoplastic alpha phase gutta-percha.8 The central plastic core of Soft-Core is round and hollow. Its depth corresponds to the diameter and the length of the insertion pin. However, Thermafil has a V shaped central plastic core. JS Quick-Fill is a recently introduced mechanically thermoplasticized gutta-percha obturation method in which a titanium carrier similar to a lentulo is covered with gutta-percha and warmed by wall friction resulting from rotating it within the root canal.
The plasticized gutta-percha is impulsed apically, and then the carrier can be removed from the root canal or left in place.9 Another warmed gutta-percha technique System B (endodontic heat source unit) designed to modify Schilder��s technique by obturating the root canal system with a single continuous wave of thermoplasticized gutta-percha.6 Lately, Microseal system was introduced. In this technique; a master gutta-percha cone is first compacted laterally with a spreader and then thermoplasticized gutta-percha is delivered and compacted with an electric compactor in order to unite with the master cone and fill the rest of the root.10 Fluid filtration has been used to measure microleakage since 1986.
This method has been more acceptable in measuring leakage than linear dye-penetration measurement techniques.11 The samples are not destroyed and it is possible to obtain measurements of microleakage at intervals over extended time periods. Also, dye penetration studies have limitations because trapped air has been shown to restrict the penetration of dye.12,13 It��s indicated that it is more relevant to measure the amount of fluid transversing through a canal than measuring the length of a gap in a filled canal. However, conventional fluid filtration measurements are relatively subjective due to direct visual readings. A computerized, fully electronic, reliable and digital air pressure checking system is required to remove this deficiencies.
14 The purpose of this in vitro study was to compare apical microleakage of teeth filled with different gutta-percha techniques using a computerized fluid filtration meter. MATERIALS AND METHODS Sixty extracted AV-951 human non-carious single rooted teeth were used in this study. The crowns were removed and a lingual access was prepared in each tooth and instrumented using step-back technique. The teeth were irrigated with 5.25% sodium hypochloride before and after recapitulation using a size 60 master apical file and then dried with paper points. Sixty teeth were assigned to six groups (10 of each).
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