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Despite the excellent properties of resin composites, one main drawback of composites is the comparably high fragility and low fracture strength in stress-bearing posterior restorations. Ĭomposite restorations are suitable for use in both anterior and posterior teeth. The fracture resistance of a composite material may depend on the specific failure mode of heterogeneous materials.

Experimental and theoretical efforts are made to check the fracture resistance of the material and correlate it with the hardness and stability of the material. ,, On exertion of extreme force, the fracture would emanate, which can be either complete or incomplete. Adhesive restorations are more effective in relaying and diffusing functional stresses over the bonding interface, with the added capability of sustaining weakened tooth form. Transfer of stress tends to be different in a restored tooth compared to an intact tooth.

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, MOD preparations usually bring about a significant reduction in tooth strength because of the loss of marginal ridges and microfractures caused by applied occlusal forces. ĭebilitation of the teeth following mesio-occluso-distal (MOD) preparations and reinforcing the residual tissues by restorations have been focused on in various studies. The newer composites and adhesive systems are rapidly developing to replace silver amalgam restoration and protect the remaining tooth structure. The demand for esthetic restorations is increasing day-by-day and restorations of posterior with resin-based composite materials are gaining a lot of popularity. Available from: Įsthetic dentistry is a rapidly evolving discipline. Fracture Resistance of Teeth Restored with Newer Methacrylate-Based Dental Composite Materials: An In Vitro Study.

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How to cite this URL: Narayanan S, Hegde MN, Thirunarayanan S, Dsouza TS.

How to cite this article: Narayanan S, Hegde MN, Thirunarayanan S, Dsouza TS. Keywords: Composites, fracture resistance, flexural strength, universal testing machine The packable submicron methacrylate-based composite material also showed higher flexural strength than stackable nanohybrid composite material. Conclusion: Fracture resistance was highest in the group restored with the packable submicron hybrid composite material. Tukey test showed fracture resistance differed significantly between Group II and Group IV ( P = 0.042) and no significance among other groups. The mean fracture resistance overall differed significantly between the four groups ( P = 0.048). The statistical significance ( P < 0.05) of the differences between the experimental groups was analyzed by ANOVA and Tukey post hoc test. The flexural strengths of the two composite materials were also analyzed using three-point bending test using Universal Testing Machine. The teeth were embedded in resin-filled PVC rings, and a compressive loading test was carried out for all groups at a cross-head speed of 0.5 mm/min. Group I − intact teeth with no preparations ( n = 10), Group II − prepared but unrestored teeth ( n = 10), Group III − teeth prepared and restored with a stackable nanohybrid methacrylate-based composite material (IPS Empress DirectTM), and Group IV − teeth prepared and restored with a packable submicron methacrylate-based composite material (Brilliant EverglowTM), respectively. Methods: Sixty mandibular premolars were divided into two control groups of 10 teeth each and two experimental groups of 20 teeth. The present study was done to compare the fracture resistance of teeth restored using two newer methacrylate-based composite materials, along with the flexural strength of the composites. Methacrylate-based composite with the addition of nanoparticles to the filler has been introduced in the market, providing improved esthetics and lower polymerization shrinkage. Modifications have been made on the filler particle size and loading, followed by alterations in the resin matrix substance. Introduction: Composite have evolved significantly due to the increase in the demand for a more esthetic and conservative approach in dentistry.

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