Differences in the physical properties of composite dental restoratives

Abstract

A method for accelerated testing of dental composite restorative materials is described, and results of these tests are reported. The uniform testing showed considerable variation in the properties of the eight materials included in the study.

Fracture Resistance of Teeth Restored with Class II Bonded Composite Resin

“…However, many factors influence the longevity and suitability for clinical use of the bonded composite resins. Factors that adversely affect the bond strength of the resins and can contribute to microleakage include polymerization shrinkage (Asmussen, 1975;Lee and Orlowski, 1977;Lambrechts et al, 1982;Bowen et al, 1983;Davidson et al, 1984), variations in temperature (Draughn, 1976;Rupp et al, 1983;Taylor et al, 1984;Gross et al, 1985;Eliades and Caputo, 1985), and dynamic loading (J6r-gensen et al, 1976;Munksgaard et al, 1985). Due to these shortcomings and the lower wear resistance exhibited by many composite resins in the clinical setting, further improvements are needed in the composite resins and the bonding agents, and additional laboratory and clinical testing is needed before _____ _____._.__ these materials can be recommended for prevention of tooth fractures.…”

Staining of composite resins by cigarette smoke

“…Staining of composite resins by beverages, cosmetics and chemical stains have been reported (Lee, Orlowski & Kobashigawa, 1973;MacPherson, 1975;Haysahi et al, 1974;Lee & Orlowski, 1977;Gross & Moser, 1977). Colorimetry is often employed in evaluating colour changes in composite resins.…”

“…Composite resins are often used when the aesthetics of restorations are of prime importance; thus, the colour stability of composite restorative materials are of interest. Staining of composite resins by beverages, cosmetics and chemical stains have been reported (Lee, Orlowski & Kobashigawa, 1973;MacPherson, 1975;Haysahi et al, 1974;Lee & Orlowski, 1977;Gross & Moser, 1977). Colorimetry is often employed in evaluating colour changes in composite resins.…”

The curing pattern of photo‐initiated dental composites

“…in the visible range ofthe e.m. spectrum. From an initiating mechanism it might be expected that a chemical propagation reaction is started, that will cure the bulk ofthe material (Lee & Orlowski, 1973). In practice, the activation ofthe curing process by radiation faces difficulties in those cases where the material to set cannot be reached properly by the radiation.…”