Abstract
The aim of this study was to evaluate the diametral tensile strength (DTS) of composite resins submitted to different curing techniques. Four composite resins were tested in this study: Targis (Ivoclar), Solidex (Shofu), Charisma (Heraeus-Kulzer) and Filtek Z250 (3M Espe). Sixty-four cylindrical specimens were prepared and divided into eight groups according to each polymerization technique (n = 8). The indirect composite resins (Targis and Solidex) were polymerized with their respective curing systems (Targis Power and EDG-lux); Charisma and Filtek Z250 were light-cured with conventional polymerization (halogen light) and additionally, with post-curing systems. Specimens were stored in artificial saliva at 37 degrees C for one week. DTS tests were performed in a Universal Testing Machine (0.5 mm/min). The data were statistically analyzed by ANOVA and Duncan tests. The results were (MPa): Z250/EDG-lux: 69.04 feminine; Z250/Targis Power: 68.57 feminine; Z250/conventional polymerization: 60.75b; Charisma/Targis Power: 52.34c; Charisma/conventional polymerization: 49.17c; Charisma/EDG-lux: 47.98c; Solidex: 36.62d; Targis: 32.86d. The results reveal that the post-cured Z250 composite resin showed the highest DTS means. Charisma composite presented no significant differences when activation techniques were compared. Direct composite resins presented higher DTS values than indirect resins.
Highlights
An important milestone in the history of modern restorative dentistry was the development of light-cured composite resins for direct procedures[1,7,9,14]
The Duncan test showed that a major range of Diametral Tensile Strength (DTS) values was presented by group Z250 with post-curing using EDG-lux (G7)
This group did not show statistical differences in relation to the Z250 resin group which was post-cured with Targis Power (G8)
Summary
An important milestone in the history of modern restorative dentistry was the development of light-cured composite resins for direct procedures[1,7,9,14]. Improvements in composite resin mechanical properties and light curing devices have permitted their use in posterior teeth with greater reliability than was the case some years ago[1,3,7,9]. Shrinkage stress is one of the inherent disadvantages that occur when visible lightactivated resin composites are submitted to light. *** PhD, Assistant Professor, Department of Statistics and Mathematics, Higher School of Agriculture “Luiz de Queiroz” (ESALQ), University of São Paulo. Diametral tensile strength of composite resins submitted to different activation techniques. Braz Oral Res 2006;20(3):[214-8]
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