The resin matrix of dental composite usually contains prime methacrylate resins and diluent methacrylate resins.A resin matrix formulation has been developed in which no diluent is used but which still has reasonable viscosity for a high percentage of inorganic fillers.The advantages include low polymerization shrinkage, low polymerization heat, less degradation in aged products, and less hydrolysis in polymer chains.One formulation utilizing ethoxylated Bis-GMA and patented polycarbonate dimethacrylate produced a dental composite with superior strength, stain resistance, handling and appearance.The properties of the composite were compared with some brand-name composites on the market.

Journal of Applied Medical Polymers

A potential screening method for interface stability in particulate filled dental composites

Author: Karmaker, A. ; Prasad, A. ; Sarkar, N.

This study involves in-vitro simulation and characterization of the degradation process of dental composites.Composite formulations with different silane contents on filler surfaces were preparedCylindrical test specimens of 6 mm diameter and 3 mm depth were prepared using visible light curing system.Cured specimens were treated with an aqueous solution of 0.1N NaOH at 60° for various time intervals.They were then neutralized with HCl solution followed by 24 h immersion in distilled water and air-dried.The radial surface of each specimen was polished and the depth of degradation was measured using an optical microscope.Specimens with optimized silane content exhibited the lowest degradation, and those with unsilanated fillers displayed the highest.

Journal of Applied Medical Polymers

Effect of water sorption on mechanical properties of fiber reinforced dental resin

Author: Karmaker, A. ; Prasad, A.

Composites from different glass fibers reinforced in dimethacrylate based dental resins were prepared for flexural tests in accordance with ISO 10477.Tests were conducted on both dry specimens and specimens stored in water for 7 days at 37°.Depending on the type and number of fibers, the strengths were found to decrease from moderate to minor.Loss of strength correlated with the constituents of fibers.

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