Recently, a methacrylate-based obturation system, Resilon/RealSeal SE, has been developed to replace gutta-percha and traditional sealers. As a resin-based material, degree of conversion (DC) is one of the most important characteristics. The aim of this study was to investigate the time-dependent change of DC of RealSeal SE as well as the influence of canal moisture and root canal depth on it.
DC of RealSeal SE, either self-cured or dual-cured (n = 8 in each group), was calculated according to the Raman spectra obtained at different times after mixing. Thirty extracted teeth with single canal were instrumented and divided randomly into 2 groups in terms of different canal drying methods. In the ethanol group, excess distilled water in root canal was removed with paper points followed by 95% ethanol. In the paper points group, root canals were blot-dried with paper points until the last one appeared dry. DC of RealSeal SE was calculated from serial cross sections (2, 5, and 8 mm from the apex) obtained 1 week after obturation with Resilon/RealSeal SE.
Significant increase in DC of RealSeal SE was observed in 1 week (P < .01), with little change afterwards (P > .05). DC of sealer in ethanol group was significantly higher than in paper points group (P < .01). However, DCs of RealSeal SE at different levels of tooth sections were not significantly different (P > .05).
Both self-cured and dual-cured RealSeal SE achieved stable DC after 1 week. Root canal moisture was a critical factor in determining DC of RealSeal SE.
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- Filling root canals in three dimensions.J Endod. 2006; 32: 281-290
- An evaluation of microbial leakage in roots filled with a thermoplastic synthetic polymer-based root canal filling material (Resilon).J Endod. 2004; 30: 342-347
- Fracture resistance of endodonticaly treated roots using a new type of resin filling material.J Am Dent Assoc. 2004; 135: 646-652
- Correlation between hardness and degree of conversion during the setting reaction of unfilled dental restorative resins.Dent Mater. 1985; 1: 11-14
- Biological aspects of root canal filling materials: histocompatibility, cytotoxicty, and mutagenicity.Clin Oral Investig. 1997; 1: 5-11
- Effect of 2-hydroxyethyl methacrylate on human pulp cell survival pathways ERK and AKT.J Endod. 2008; 34: 684-688
- Analysis of tissue reactions to methacrylate resin-based, epoxy resin-based, and zinc oxide-eugenol endodontic sealers.J Endod. 2009; 35: 229-232
- Cytotoxicity of Epiphany and Resilon with a root model.Int Endod J. 2006; 39: 940-944
- Cytotoxicity of a new root canal filling material on human gingival fibroblasts.J Endod. 2006; 32: 756-758
- Initial in vitro biological response to contemporary endodontic sealers.J Endod. 2006; 32: 989-992
- Apical limit of root canal instrumentation and obtruation: part 2—a histological study.Int Endod J. 1998; 31: 394-409
- Interpretation of bond failure through conversion and residual solvent measurements and Weibull analyses of flexural and microtensile bond strengths of bonding agents.Dent Mater. 2005; 21: 354-364
- Measurement of adhesion of endodontic sealers to dentin.J Endod. 2002; 28: 351-354
- Bonding of resin-based sealers to root dentin.J Endod. 2009; 35: 121-124
- Extended setting shrinkage behavior of endodontic sealers.J Endod. 2008; 34: 90-93
- Effect of chemical structure and composition of the resin phase on vinyl conversion of amorphous calcium phosphate-filled composites.Polym Int. 2007; 56: 497-505
- Effect of water content on the physical properties of model dentine primer and bonding resins.J Dent. 1999; 27: 209-214
- Time-dependent conversion of a methacrylate-based sealer polymerized with different light-curing units.J Endod. 2009; 35: 110-112
- Some effects of water on dentin bonding.Dent Mater. 1995; 11: 132-136
- Significance of moist root canal dentin with the use of methacrylate-based endodontic sealers: an in vitro coronal dye leakage study.J Endod. 2008; 34: 76-79
- Curing potential of dual-polymerizable resin cements in simulated clinical situations.J Prosthet Dent. 2001; 86: 101-106
- Remaining unreacted methacrylate groups in resin-based composite with respect to sample preparation and storing conditions using micro-Raman spectroscopy.J Biomed Mater Res B Appl Biomater. 2008; 87: 468-474
- Characteristic Raman frequencies of organic compounds.John Wiley, New York1974
- Curing depth of a resin-modified glass ionomer and two resin-based luting agents.Oper Dent. 2005; 30: 185-189
- Polymerization efficiency of different photocuring units through ceramic discs.Oper Dent. 2006; 31: 68-77
- An FTIR study of the setting reaction of various endodontic sealers.J Endod. 2007; 33: 616-620
- Determination of residual double bonds in resin-dentin interface by Raman spectroscopy.Dent Mater. 2003; 19: 245-251
- The micro-Raman spectroscopy, a useful tool to determine the degree of conversion of light-activated composite resins.J Biomed Mater Res. 1999; 48: 675-681
- Impact of immediate and delayed light activation on self-polymerization of dual-cured dental resin luting agents.Acta Biomater. 2009; 5: 2095-2100
- Contraction stress related to degree of conversion and reaction kinetics.J Dent Res. 2002; 81: 114-118
- Geometric factors affecting dentin bonding in root canals: a theoretical modeling approach.J Endod. 2005; 31: 584-589
- Continuing etching of an all-in-one adhesive in wet dentin tubules.J Dent Res. 2005; 84: 350-354
- Durability of resin-dentin bonds to water- vs ethanol-saturated dentin.J Dent Res. 2009; 88: 146-151
- Two modes of nanoleakage expression in single-step adhesives.J Dent Res. 2002; 81: 472-476
- Degree of conversion of resin blends in relation to ethanol content and hydrophilicity.Dent Mater. 2008; 24: 1194-1200
Published online: December 16, 2009
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