Current Trends in Dental Composites

Abstract

ABSTRACT:The clinical performance of dental composites has been significantly improved over the past decade through modifications in formulation that include: using more stable polymerization promoters for greater color stability; incorporating high concentrations of finely ground fillers to produce adequate strength and excellent wear resistance while retaining translucency; adding radiopacifying agents for improved diagnostics; and utilizing dentin adhesives. However, there are problems which limit the use of composites, especially in posterior teeth. The materials remain very technique-sensitive, due to the extensive contraction which accompanies polymerization and negatively influences marginal sealing. In addition, the materials are generally considered to have inadequate mechanical properties and wear resistance in contact areas to serve as total replacements for amalgams. Current efforts are focusing on several areas, including the development of non-or minimallyshrinking dental composites containing spiro-orthocarbonates as additives to dimethacrylates or epoxy-base resins, and the production of alternative filler materials for ideal wear resistance and esthetics. This paper reviews the composition and characteristics of current dental composites, as well as recent areas of study.

Reinforcement of flowable dental composites with titanium dioxide nanotubes

“…bis(methacryloyloxymethyl) tricyclodecane, and urethane tetramethacrylate (UTMA) can be used to reduce the viscosity of Bis-GMA [9].…”

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

“…Researches conducted on dental composites indicate that strength, elasticity modulus, wear resistance, polymerization shrinkage and generally, the physical and mechanical properties of the composite are improved in direct relation to the amount of micro or nano fillers added [5]- [10].…”

Effect of aging type and aged unit on the repair strength of resin composite to feldspathic porcelain in testing microtensile bond strength

“…Therefore, only the sticks obtained from the internal part of the blocks are used for µTBS test. The non-significant bond strength between the STC and SS in this study 10 indicates similar type of aging due to limited bonding area of 1mm 2 . Similar Weibull moduli (STC: 3.4; SS: 3.5) in these two groups also support this assumption.…”

“…Essentially, in both situations resinous materials are used that are composed of organic polymer matrix and reinforced inorganic filler particles [10]. Although it is important to quantify the initial bond strength between ceramic restorations and cements or repair materials, the clinical relevance of the studies increases when the bond test is performed after aging the interface [5].…”