Comparative Evaluation of Three Different Flowable Intra-Orifice Barriers on the Fracture Resistance of Endodontically Treated Roots Obturated With Gutta Percha- An Invitro Study.
Journal Title: International Journal of Dental Science and Innovative Research (IJDSIR) - Year 2019, Vol 2, Issue 3
Abstract
Introduction Root canal therapy has provided dentistry with the ability to preserve the teeth which would have been extracted years before. Root canal treated teeth are more prone to fracture than vital teeth because of excessive loss of tooth tissue, dehydration of the dentin, and loss of proprioception. The major goal of root canal therapy should be to reinforce the remaining tooth structure. Studies have found out that use of intracoronal barriers can prevent coronal microleakage and can also provide strength against forces that generate root fractures. 1 The retention of an adhesive restorative material is based on micromechanical retention or chemical bonding, it does not require macro-retentive components, minimal invasive preparation with maximal conservation of dentinal tissue can be realized. Coronal reinforcement of the tooth has been demonstrated through bonded restorations. Thus, there is a need for different materials and/or techniques to overcome the shortcomings of current endodontic filling materials to reinforce the roots. 2 Through the use of restorative materials with elastic moduli similar to the dentin, it might be logical to assume that Intra-orifice barriers can also provide stiffness against forces that generate root fractures.3 An Intra-orifice barrier is an efficient alternative to decrease coronal leakage in endodontically treated teeth, and thus helps in hermetic coronal seal.4Different materials such as amalgam, Cavit, glass ionomer cement, composite resin, Mineral Trioxide Aggregate (MTA), and Intermediate Restorative Material (IRM) are used for this purpose.5,6,7 SureFil SDR flow (SDR; Dentsply Caulk, Milford, DE, USA), one of the bulk-fill composite resins recently introduced to the market, is a silorane-based nano- and micro-hybrid composite with low viscosity; its shrinkage stress is lower than conventional fluids.8 Bulk fill flowable resin composites are used in association with conventional composites for aesthetic restorations in posterior teeth, having lower polymerization stress, better flow with easy placement, an excellent adaptation to the cavity walls and low modulus of elasticity, which can reduce the stress generated on the cavity walls.9 Multi Core which is a dual cure composite resins have gained attention recently as restorative materials and are recommended to be used in high stress bearing areas. Multi Core is a fluoride containing radio-opaque composite.10 RMGIs were produced by adding methacrylate to polyacrylic acid. Some of them are light-cured, which is supplementary to the basic acid-base reaction. 11 It has a modulus of elasticity similar to that of the dentin, which is about 14-16 GPa.12 Very few studies have assessed the reinforcing effect of intraorifice barriers placed over root canal fillings. Hence in this study the fracture resistance of different intraorifice barriers were assessed on obturated roots. Aim To compare the effects of different materials used as intraorifice barriers on the fracture resistance of endodontically treated roots obturated with gutta-percha and AH plus sealer.
Authors and Affiliations
Dr. Paul Pritam M.
Keywords
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