Abstract

GIANNINI, Marcelo et al. Efeito de cerâmicas odontológicas na passagem da luz emitida por aparelhos fotoativadoresEffect of dental ceramics on the transmittance of light emitted by curing units. Rev. Assoc. Paul. Cir. Dent. [online]. 2013, vol.67, n.4, pp. 287-299. ISSN 0004-5276.

This study evaluated the influence of different types of restorative indirect materials (zirconium oxide and lithium disilicate) in transmittance of light emitted by different types of curing units. Discs with 1 mm thickness and 10 mm diameter were prepared from the indirect restorative materials: IPS e.max ZirCAD (Ivoclar Vivadent) and IPS e.max (Ivoclar Vivadent). A nanofluorapatite ceramic (IPS e.max, Ivoclar Vivadent) was applied over the indirect materials with 1 mm thickness. Five different light curing units were tested: Arc Light II (Air Technologies), ColtoLux LED (Coltène Whaledent), Elipar Free Light 2 (3M ESPE), Astralis 10 (Ivoclar Vivadent) and Ultralume 5 (Ultradent), which was used in regular mode, only light blue and only violet. The Irradiance through different restorative materials was measured using a spectroradiometer (DAS 2100, Labsphere) associated with a specific software (Spectra Suite, Ocean Optics). Data were analyzed by two-way analysis of variance and Tukey test (p≤0,05). The plasma arc curing unit (Arc Light II) showed the highest irradiance values through different restorative materials, while the light source Ultralume 5, violet mode, showed the lowest irradiance values through different restorative materials. The zirconia allowed higher light intensity passed through it when compared to lithium disilicate. The indirect restorative materials tested showed distinct properties regarding the transmittance of light. Type of curing unit significantly influenced the Irradiance through different restorative materials.

Keywords : Ceramics light; polymerization; dental materials.