Thermographic investigation of contemporary resin-containing dental materials.
OBJECTIVE
To measure the temperature rise induced during visible light curing of modern resin-containing dental materials and the effect of dentine sections in reducing this temperature rise.


METHODS
A variety of newly introduced resin-containing materials were investigated, including flowable, packable and conventional hybrid composites, as well as a compomer and a resin modified glass ionomer material. The resin was packed into polytetrafluoroethylene (PTFE) moulds and cured for 40s. Temperature rises on the undersurface of the curing resin were measured using the Thermovision 900 infra-red scanning system. In the second part of the study, extracted, caries free teeth were sectioned into dentine disks of three thicknesses (0.7, 1.4 and 1.9 mm). Composite samples were overlaid by the disks and the insulating effect of dentine measured.


RESULTS
The maximum temperature increases were: 43.1 degrees C (flowable composite), 32.8 degrees C (conventional composite), 32.8 degrees C (RMGI), 23.3 degrees C (compomer) and 22.4 degrees C (packable composite).


CONCLUSIONS
There was a quantifiable amount of heat generated in resin-containing material during light curing. Dentine sections were good thermal insulators that significantly reduced temperature rises associated with resin composite photocuring.
Al-Qudah
A A
AA
Division of Restorative Dentistry, Jordan University of Science and Technology, Jordan.
Mitchell
C A
CA
Biagioni
P A
PA
Hussey
D L
DL
D000704:Analysis of Variance; D020770:Compomers / Q000528:radiation effects*; D003188:Composite Resins / Q000528:radiation effects*; D003804:Dentin / Q000502:physiology; D005899:Glass Ionomer Cements / Q000737:chemistry / Q000528:radiation effects; D006801:Humans; D008027:Light; D008422:Materials Testing; D044367:Phase Transition; D012044:Regression Analysis; D013696:Temperature; D013814:Thermal Conductivity; D013817:Thermography
D020770:Compomers; D003188:Composite Resins; C088486:Dyract; D005899:Glass Ionomer Cements; C102735:Revolution (composite resin); C403464:SureFil packable composite; C467914:TPH spectrum; C084550:Vitremer