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Title

Influence of light-curing protocols on polymerization shrinkage and shrinkage force of a dual-cured core build-up resin composite

Authors
Taubock, Tobias
Buchalla, Wolfgang
Attin, Thomas
Published in European Journal of Oral Sciences. 2010, vol. 118, p. 423-429
Abstract This study investigated the influence of time delay and duration of photo-activation on linear polymerization shrinkage, shrinkage force, and hardening of a dual-cured core build-up resin composite. The test material (Rebilda DC) was light-cured for 20 or 60 s either early (2 min) or late (7 min) after the start of mixing. Non-irradiated self-cured specimens served as controls. Linear shrinkage and shrinkage force were measured for 60 min using custom-made devices. Knoop hardness was determined at the end of the observation period. Self-cured controls, showing a linear shrinkage similar to that of specimens early light-cured for 20 s generated the lowest shrinkage force and hardness. A shorter light exposure time (20 s vs. 60 s) reduced linear shrinkage, shrinkage force, and hardness when early light-curing was performed, but did not affect the three properties in specimens light-cured late after the start of mixing. Late photo-activation increased linear shrinkage, irrespective of irradiation time, and resulted in a higher shrinkage force and hardness for short light exposure time. A moderate correlation was found between the two shrinkage properties studied (r(2) = 0.65). In conclusion, improvements in shrinkage behavior of the tested core build-up material were associated with inferior hardening, making it important to adapt curing protocols to the clinical situation.
Identifiers
PMID: 20662918
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Structures
Research group Groupe Krejci Ivo (médecine dentaire) (240)
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(ISO format)
TAUBOCK, Tobias et al. Influence of light-curing protocols on polymerization shrinkage and shrinkage force of a dual-cured core build-up resin composite. In: European Journal of Oral Sciences, 2010, vol. 118, p. 423-429. https://archive-ouverte.unige.ch/unige:55688

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Deposited on : 2015-04-23

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