title: Influence of composite restorative materials and light-curing units on diametrical tensile strength.
abstract: 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.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas.
authors.forename: Maria Cecília Caldas Giorgi
authors.initials: MC
authors.lastname: Tolosa
authors.forename: Luís Alexandre Maffei Sartini
authors.initials: LA
authors.lastname: Paulillo
authors.forename: Marcelo
authors.initials: M
authors.lastname: Giannini
authors.forename: Alex José Souza dos
authors.initials: AJ
authors.lastname: Santos
authors.forename: Carlos Tadeu dos Santos
authors.initials: CT
authors.lastname: Dias
mesh_terms: 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
chemical_list: C084111:Charisma composite resin; D003188:Composite Resins; D006219:Halogens