Argon-Ion Laser Vs Quartz-Tungsten-Halogen Curing of Polyacid Modified Composite Resin Restorative Materials

Abstract

This study evaluated the differences in mechanical properties (flexural strength, surface roughness, and micro hardness) of three commercially available compomer restorative materials (Compo glass F, F2000, and Dyract AP), that were cured by argon laser (AL) and the traditional visible light quartz-tungsten-halogen (QTH) sources. Twenty eight nominally identical disc-shaped specimens, from each material, were prepared in a cylindrical split Teflon mold (6mm diameter, 2 mm thickness; to allow for one-step curing regime). Half of the specimens were cured by 40s. Exposure to a QTH curing unit and the other half by 10s. Exposure to AL on top and bottom surfaces. Fourteen samples from each material (seven for each curing type) were subjected to surface profile-measuring instrument. Samples used for surface roughness were also used to measure Knoop Hardness Number (KHN). The bi-axial flexure strength, of the remaining disc-shaped specimens was determined using the 'piston on ball' technique using the universal testing instrument to apply a compressive load perpendicularly through a ball indenter 4 mm in diameter at a crosshead speed of 1 mm/ min. Results of the work showed that there was no statistical significant difference between the two techniques of compomer curing (P>0.05). It was concluded that the argon laser cured compomer effectively as traditional visible light but with time saving.