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Revista odontológica mexicana
versión impresa ISSN 1870-199X
Resumen
OROZCO BARRETO, Rossany; ALVAREZ GAYOSSO, Carlos y GUERRERO IBARRA, Jorge. Light-polymerization of composite resins through different thicknesses of dental tissue. Rev. Odont. Mex [online]. 2015, vol.19, n.4, pp.222-227. ISSN 1870-199X. https://doi.org/10.1016/j.rodmex.2015.10.002.
Objectives:
To determine the thickness of dental tissue through which Prime Dent Resin® might exhibit light-polymerization with minimum shrinkage and suitable curing depth.
Method:
80 laminae measuring 1, 2, 3 and 4 mm thickness were obtained from molars (20 laminae per group). Contraction was measured and resin shrinkage was calculated by polymerization (Visilux 2, 3 M) though each lamina (60 s, 400 mW/cm2). Bonded-disk technique was used. Depth of curing tests were undertaken by measuring the thickness of polymerized resin according to ADA's specification number 27. A control group without dental tissue was prepared for both properties. Data were analyzed using ANOVA with Tukey test (p < 0.001).
Results:
Curing depth: curing depth decreased as thickness increased. All groups revealed statistically significant differences. The thickness that exhibited lesser shrinkage nonetheless meeting with suitable curing depth (ADA establishes minimum value of 1 mm) was the 3 mm group. Shrinkage: as thickness increased, shrinkage decreased; no statistically significant difference was reported for groups 2 and 3 mm.
Conclusions:
According to obtained results, it is possible to polymerize through a 3 mm thickness, therefore polymerization is not recommended through a 4 mm depth. It will be necessary to obtain further mechanical properties using different thicknesses of dental tissue.
Palabras llave : Polymerization contraction; shrinkage; curing depth; light-curing resin; thickness of dental lamina; polymerization.