AVALIAÇÃO ESPECTRAL DA FLUORESCÊNCIA DE CINCO CERÂMICAS LIVRES DE METAL

Abstract

The purpose of this study was to evaluate the generated fluorescence during ultraviolet light exposure on five metal-free ceramics. Samples were grouped according to the brand: Group I Classic (Ivoclar-Vivadent); Group II IPS Empress 2 (Ivoclar-Vivadent); Group III In-Ceram Alumina (Vita); Group IV In-Ceram Spinell (Vita) and Group V IPSd.SING (Ivoclar-Vivadent). A spectrofluorometer (Fluorescence Spectrophotometer F 4500 Hitachi) was used as the measuring tool. The test samples consisted of discs (15mm diameter and 2mm thick) made form each ceramic brand following the manufacturer specifications. Each disc was attacked by ultraviolet rays with a wave length of 390nm to register fluorescence from a 400nm to 700nm range. The fluorescence present was registered as a Fluorescence Intensity curve and as wave length. The data was analyzed applying ANOVA (test Nueman-Keuls) with a significance level of p<0,05. The fluorescence intensity mean found was: Group I-2432au; Group II-3216au; Group III-398au; Group IV -408au and Group V-2839au. The wave length mean obtained was: Group-I 447.6nm; Group II-450.1nm; Group III-459.7nm; Group IV-458.9nm and Group V-449.2nm. It was concluded that there was significant difference between the fluorescence intensity where groups III and IV presented the least values and group II the highest value. With respect to wave length, no significant difference was found between groups II and V and between III and IV. From the five groups analyzed, IPS Empress 2 and IPS d-SIGN presented wave length values similar to natural dentition data found in the literature.