Effect of storage time on microtensile strength of polyacid-modified resin composites

摘要

Objective. The purpose of this study was to determine the cohesive microtensile strength of four polyacid-modified resin composites' (PAMRC: Dyract, Dyract AP, Freedom and F2000) after 24 h and 6 months of storage in water using the microtensile technique. Methods. Blocks measuring 1.5 cm X 1.5 cm X 1.0 cm were constructed incrementally for each material using a silicone matrix. The blocks were stored in distilled water at 37℃ for 24 h and were then serially sectioned in both x and y directions to obtain several beams measuring 1.0 cm X 1.0 mm X 1.0 mm. Each beam was gently trimmed from two sides with ultra-fine diamond burs to reduce the cross-sectional area to a 'neck' of approximately 0.4 mm~2 located in the middle of their length. The beams (18-22 per material) were randomly divided and tested in tension either after 24 h or after 6 months of storage in water at 37℃ in a Vitrodyne testing machine at 0.6 mm/min. Results. Mean microtensile strengths (MPa) at 24 h were: 48.7 +- 13.8 for Dyract AP; 36.5 +- 14.1 for Dyract; 38.2 +-14.5 for Freedom and 48.6 +- 7.2 for F2000. There was no statistically significant difference among the materials (p > 0.05). At 6 months, only Dyract AP showed significant increase in microtensile strength (p < 0.05) while the other materials showed no differences in microtensile strength with time (p > 0.05). Significance. The results indicate that storage in water for 6 months caused no reduction of the microtensile strength of PAMRC materials.