Physical Properties of Composites Cured With Conventional Light or Argon Laser

Abstract

Objective: This study evaluated various physical properties of two resin composites polymerized by either an argon laser or a conventional visible light. Materials and Methods: A hybrid composite, Herculite XRV (Kerr Corp., Orange, California), and a microfill composite, Durafill VS (Kulzer, Wehrheim, Germany), were used in this study. Three physical properties, diametral tensile strength, compressive strength, and flexural strength, were tested. Five specimens of each composite resin were made for each set of physical properties tested, for a total of 18 groups and 90 specimens. Specimens were fabricated according to the American National Standards Institute and American Dental Association Specification No. 27 for each property tested. The composite was polymerized with either an argon laser (power density of 1000 mW/cm2) for 10 or 20 seconds or a conventional visible light (power density of 354 mW/cm2) for 40 seconds. Specimens were stored in water in light‐proof containers at 37°C for 7 days before testing with a Zwick (Atlanta, Georgia) universal testing machine. Results: The physical properties of Herculite XRV were not affected by the light source or exposure time. For Durafill VS, no significant differences were observed for the diametral tensile strength whether the argon laser or conventional light was used. However, the flexural strength of the microfill was significantly lower when polymerized with the argon laser a t 10 seconds compared with the two other curing methods (20‐second laser cure, 40‐second conventional cure). Also, the compressive strength of Durafill VS polymerized with the argon laser a t 10 seconds was significantly lower than when it was cured with the conventional light for 40 seconds. Conclusions: Hybrid and microfill resin composites cured with an argon laser for 20 seconds had physical properties comparable to composites polymerized with a conventional visible light unit for 40 seconds. Therefore, with adequate exposure time, the argon laser is a potential alternative to conventional visible light‐curing.

Degree of conversion of different composite resins photo-activated with light-emitting diode and argon ion laser

“…As an alternative but expensive and complex technology, argon ion lasers, have been used [28][29][30]. The main advantage of this LCU is the high-power density of the emitted radiation, which reduces the polymerization time.…”

Seramik restorasyonların mikrosızıntısı üzerine yüksek yoğunluklu LED işık kaynağı mesafesinin değerlendirilmesi

“…A series of chemical reactions create polymerization, which the macromolecule, or the polymer, is formed by linkage of a large number of small molecules, known as monomers (Stephen et al 2009). Various researchers (Cobb et al 1996, Bouschlicher et al 1997, Hashimoto et al 2004 have shown that physical properties of the filling are affected by variations in the procedure steps. For example, inadequate resin polymerization results in increased microleakage of resin composite, and thus decreased integrity of the adhesion surrounding the margins.…”

Effects of High-Intensity Curing Lights on Microleakage under Bonded Lingual Retainers

“…4 Manufacturers have recently presented plasma arc curing (PAC) lights, 5,6 argon lasers, 7,8 and solid-state light-emitting diodes (LEDs) [9][10][11] as alternatives to QTH curing units. The use of these high-intensity units has been recommended because they can enhance monomer conversion while decreasing curing time.…”