Possible improvements of clinical properties of dental composite materials with pulsed blue laser curing

Tarle, Zrinka; Meniga, Andrej; Ristić, Mira; Šutalo, Jozo; Pichler, Goran (1998) Possible improvements of clinical properties of dental composite materials with pulsed blue laser curing. Croatica Chemica Acta, 71 (3). pp. 777-787. ISSN 0011-1643

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Abstract

Despite considerable improvements of dental composite materials, the present-day composite resins still suffer from two major shortcomings that limit their use: inadequate degree of conversion and polymerization shrinkage. The objective of this study was to evaluate the degree of conversion and polymerization shrinkage of two hybrid and two microfilled composite materials cured by pulsed blue dye laser pumped XeCl excimer laser at 308 nm and the standard curing unit. The degree of conversion was measured by a Perkin Elmer FTIR spectrometer at the surface of the material and at a 3.0 mm depth. Statistical analysis (ANOVA p < 0.05) showed a significantly higher degree of conversion values in the case of pulsed laser. Polymerization shrinkage measured by a pycnometer showed significantly lower values in the case of pulsed laser curing for six out of eight materials observed. The saturation effect in the material illuminated by monochromatic blue pulsed laser light (468 nm) may be responsible for the higher degree of conversion, while the relaxation of the molecules between nanopulses may lead to a reduced polymerization shrinkage.

Item Type:	Article
Uncontrolled Keywords:	activated restorative materials; light-cured composite; resin composites; polymerization shrinkage; mechanical-properties; conversion; intensity; dentistry; stresses; behavior
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Division of Materials Chemistry
Projects:	Project title Project leader Project code Project type Lasersko vođenje i dijagnostika procesa u parama i plazmi Goran Pichler 00350102 MZOS Sinteza i mikrostruktura metalnih oksida i oksidnih stakala Svetozar Musić 00980903 MZOS Materijali u opskrbi tvrdih zubnih tkiva Jozo Šutalo 065007 MZOS
Depositing User:	Mira Ristić
Date Deposited:	27 Nov 2013 12:50
URI:	http://fulir.irb.hr/id/eprint/1147

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