Naslov
Some properties of composite resins cured by pulsed blue laser

Autori
Tarle, Zrinka ; Meniga, Andrej ; Knežević, Alena ; Šutalo, Jozo ; Pichler, Goran ; Ristić, Mira

Izvornik
Acta stomatologica Croatica (0001-7019) 33 (1999), (1); 19-23

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
composite materials; photopolymerization

Sažetak
The purpose of the study was to analyse some properties of composite resin samples cured by pulsed laser in comparison with standard halogen light. Three bybrid and three microfilled commercial composite materials were polymerized in the experimental conditions using an excimer laser pumped dye laser (XeCl Lambda Physik LPX 100/LPD 3002) and a standard curing unit (Heliolux GTE). The samples were spectroscopically analysed (FTIR) for the degree of conversion, scanning electron microscopy (SEM) was performed for characterising the structure of the material, and volumetric shrinkage behaviour was tested using density bottle method. Statistical analysis of the data (ANOVA p<0.05) shoes that the degree of conversion values obtained by excimer laser was significantly higher for all the materials and shades tested while the polymerization shrinkage values were significantly lower compared with the conventional curing unit. Those results are clinically very important in situations whenever close approximation of the light curing tip to the composite surface is impossible. The monochromatic pulsed dye laser set at 468 nm allows high penetration into the sample and the nature of the pulse allows homogeneous high quality curing with decreased shrinkage of the composite resin. The sensitivity of the tooth after the placement of direct composite restoration is mainly connected with the polymerization contraction. Adhesive and cohesive fractures appear in dentin, hybrid layer and material itself. The amount of volumetric increase is in accordance with the degree of cure, the type of composite material and the nature of the activating light.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Dentalna medicina

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