Objectives: This study evaluated the influence of the cavity configuration factor ("C-Factor") and light activation technique on polymerization contraction forces of a Bis-GMA-based composite resin (Charisma, Heraeus Kulzer). Material and Methods: Three different pairs of steel moving bases were connected to a universal testing machine (Emic DL 500): groups A and B - 2x2 mm (CF=0.33), groups C and D - 3x2 mm (CF=0.66), groups E and F - 6x2 mm (CF=1.5). After adjustment of the height between the pair of bases so that the resin had a volume of 12 mm3 in all groups, the material was inserted and polymerized by two different methods: pulse delay (100 mW/cm2 for 5 s, 40 s interval, 600 mW/cm2 for 20 s) and continuous pulse (600 mW/cm2 for 20 s). Each configuration was light cured with both techniques. Tensions generated during polymerization were recorded by 120 s. The values were expressed in curves (Force(N) x Time(s)) and averages compared by statistical analysis (ANOVA and Tukey's test, p<0.05). Results: For the 2x2 and 3x2 bases, with a reduced C-Factor, significant differences were found between the light curing methods. For 6x2 base, with high C-Factor, the light curing method did not influence the contraction forces of the composite resin. Conclusions: Pulse delay technique can determine less stress on tooth/restoration interface of adhesive restorations only when a reduced C-Factor is present.
CITATION STYLE
Ishikiriama, S. K., Valeretto, T. M., Franco, E. B., & Mondelli, R. F. L. (2012). The influence of “C-factor” and light activation technique on polymerization contraction forces of resin composite. Journal of Applied Oral Science, 20(6), 603–606. https://doi.org/10.1590/S1678-77572012000600003
Mendeley helps you to discover research relevant for your work.