Influence of composite restorative materials and light-curing units on diametrical tensile strength.
The aim of this study was to evaluate the diametrical tensile strength (DTS) of three light-curing photo-activated composites with two different light curing units (LCU). Three types of dental restorative composites were used in this study: micro filled A110 (3M Espe); P60 (3M Espe) for posterior restorations, and micro-hybrid Charisma (Heraeus-Kulzer). The two LCUs were: halogen light (HAL) (Degulux, Degussa) and blue light emitting diode (LED) (Ultrablue, DMC). Resin composite specimens were inserted incrementally into a Teflon split mold measuring 3 mm in depth and 6 mm in internal diameter, and cured using either LCU (n = 10). Specimens were placed into a dark bottle containing distilled water at 37 degrees C for 7 days. DTS tests were performed in a Universal Testing Machine (0.5 mm/min). Data were submitted to two-way ANOVA and Tukey's test. Results were (MPa): A110/HAL: 276.50 +/- 62.94a; A110/LED: 306.01 +/- 65.16a; P60/HAL: 568.29 +/- 60.77b and P60/LED: 543.01 +/- 83.65b; Charisma/HAL: 430.94 +/- 67.28c; Charisma/LED: 435.52 +/- 105.12c. Results suggested that no significant difference in DTS was obtained with LCUs for the same composite. However, resin composite restorative materials presented different DTS.
Tolosa
Maria Cecília Caldas Giorgi
MC
Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas.
Paulillo
Luís Alexandre Maffei Sartini
LA
Giannini
Marcelo
M
Santos
Alex José Souza dos
AJ
Dias
Carlos Tadeu dos Santos
CT
D000704:Analysis of Variance; D003188:Composite Resins / Q000528:radiation effects*; D003748:Dental Equipment; D003793:Dental Restoration, Permanent / Q000295:instrumentation; D006219:Halogens; D008027:Light; D008422:Materials Testing; D012542:Scattering, Radiation; D018709:Statistics, Nonparametric; D013674:Technology, Dental / Q000295:instrumentation; D013718:Tensile Strength / Q000528:radiation effects
C084111:Charisma composite resin; D003188:Composite Resins; D006219:Halogens