1643 The Effect of Ionizing Radiation in Dental Materials
A.D. CRUZ1, A.N.S. RASTELLI2, S.M. ALMEIDA1, M.A.C. SINHORETI1, F.N. BOSCOLO1, and F. HAITER-NETO1, 1University of Campinas/FOP, Piracicaba, Brazil, 2Universidade de São Paulo, São Carlos, Brazil

Objectives: When dental material is in oral cavity can be influenced of the ionizing radiation from radiotherapy or radio-diagnosis, but just a little quantity of radiation can arrive in restoration dental. Thus the purpose of this study was to observe the effect of few ionizing radiation dose in chemical behavior of restoratives dental materials. Methods: Four different aesthetic restorative materials (Filtek A110, Surefill, Vitremer and Duceram at color A2) were used. The samples (n=25) with 2.5mm height per 5.0mm diameter were prepared following the manufacturer's instructions. The visible curing light unit Curing Light 2500 (3M/EPE Dental Products, St. Paul, EUA) was used to polimeryzation of the composite resins and glass ionomer, and Austromat oven (Keramikofen, Freilassing, Germany) was used to bake porcelain. The specimens after confection were put in acrylic case with deionized water (25oC, 1m) before the radiation process. The deionized water was changed every week. The materials were irradiated with 0.25Gy, 0.50Gy, 0.75Gy, 1.00Gy dose of the gamma radiation. After the radiation (1month) process, the specimens were dried and triturated afterwards for the spectrometric analysis using Fourier transform-infrared (FTIR) spectrometer (FT-IR Nicolet 520, Nicolet, Madison, WI, USA) through the reflectance diffuse method. The spectra were obtained at 8cm-1 resolution, 256scans, 4000-400cm-1 spectral interval. Results: The data obtained were transferred to Microcal (TM) Origin„µ Program, version 6.0 (Microcal Software Inc., Northamaptom, MA 01060 USA). For results analysis were performed data subtraction of the irradiated groups from control group and identify the spectrums regions in the subtraction graphics was different of zero because, if the groups were identical the subtraction spectrum will be equal to zero, hence, null subtraction spectrum. In all materials studied several regions of the subtraction graphics was different of zero. Conclusions: Thus chemical changes were observed in all the materials, when exposure to few radiation ionizing.

Seq #137 - Dental Materials V 2
11:00 AM-12:00 PM, Friday, 30 June 2006 Brisbane Convention & Exhibition Centre Exhibit Hall 1

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