Pulpal heat changes with newly developed resin photopolymerisation systems

Weerakoon, A. T., Meyers, I. A., Symons, A. L. and Walsh, L. J. (2002) Pulpal heat changes with newly developed resin photopolymerisation systems. Australian Endodontic Journal, 28 3: 108-111. doi:10.1111/j.1747-4477.2002.tb00402.x

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Author Weerakoon, A. T.
Meyers, I. A.
Symons, A. L.
Walsh, L. J.
Title Pulpal heat changes with newly developed resin photopolymerisation systems
Journal name Australian Endodontic Journal   Check publisher's open access policy
ISSN 1329-1947
Publication date 2002-12
Sub-type Article (original research)
DOI 10.1111/j.1747-4477.2002.tb00402.x
Open Access Status File (Author Post-print)
Volume 28
Issue 3
Start page 108
End page 111
Total pages 4
Place of publication Adelaide, S. Aust.
Publisher Blackwell for the Australian Society of Endodontology
Collection year 2002
Language eng
Subject C1
320899 Dentistry not elsewhere classified
730112 Oro-dental and disorders
Abstract Composite resin is a widely-used direct tooth coloured restorative material. Photoactivation of the polymerisation reaction can be achieved by visible blue light from a range of light sources, including halogen lamps, metal halide lamps, plasma arc lamps, and Light Emitting Diode (LED) lights. Concerns have been raised that curing lights may induce a temperature rise that could be detrimental to the vitality of the dental pulp during the act of photoactivation. The present study examined heat changes associated with standardised class V restorations on the buccal surface of extracted premolar teeth, using a curing time of 40 seconds. The independent effects of type of light source, resin shade and remaining tooth thickness were assessed using a matrix experimental design. When a conventional halogen lamp, a metal halide lamp and two different LED lights were compared, it was found that both LED lamps elicited minimal thermal changes at the level of the dental pulp, whereas the halogen lamp induced greater changes and the metal halide lamp caused the greatest thermal insult of all the light sources. These thermal changes were influenced by resin shade, with different patterns for LED versus halogen or halide sources. Thermal stress reduced as the remaining thickness of tooth structure between the pulp and the cavity floor increased. From these results, it is concluded that LED lights produce the least thermal insult during photopolymerisation of composite resins.
Keyword Bicuspid
Composite Resins
Dental Pulp
Heat, adverse effects
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Dentistry Publications
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Created: Tue, 14 Aug 2007, 17:10:37 EST