engleski

Influence of light intensity from different curing units upon composite temperature rise

The unavoidable consequence of composite resin photopolymerization is temperature rise in tooth tissue. The temperature rise depends not only on the illumination time, but also on light intensity, distance of light guide tip from composite resin surface, composition and shade of composite resin and composite thickness. The most commonly used units for photopolymerization today are halogen curing units, which emit a large spectrum wavelength. A proportion of spectrum has no influence on degree of conversion and therefore causes unnecessary temperature rise. Units based on light source - blue light emmiting diodes (LED), as an alternative for halogen curing units, have been introduced in clinical practice. The aim of this study was to show the influence of the light intensity of curing units Elipar Trilight (ESPE, Seefeld, Germany), Astralis 7 (Vivadent, Schaan, Liechtenstein) and Lux-o-Max unit (Akeda Dental, Denmark) on temperature rise in composite resin sample of Tetric Ceram (Vivadent, Schaan, Liechtenstein). The temperature was measurement with Metex M-3850 D multimeter (Pirmasens-Winzeln, Germany) with the peak of temperature probe put into unpolymerized composite resin sample 1 mm depth. The highest temperature rise was recorded by standard mode for Elipar Trilight halogen curing unit (13.3&plusmn ; ; ; ; 1.21°C after 40 seconds illumination), while the lowest temperature rise was recorded for Lux-o-Max unit based on LED technology (5.2&plusmn ; ; ; ; 1.92 after 40 second illumination).

composite resins; temperature rise; halogen curing units; blue light emiting diode

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