Temperature changes in silorane-, ormocer-, and dimethacrylate-based composites and pulp chamber roof during light-curing.
BACKGROUND
Light-curing of resin-based composites (RBCs) is associated with temperature increase in the pulp chamber, which may have a detrimental effect on the vital pulp.


OBJECTIVE
The purpose of the study was to evaluate temperature changes of silorane-, ormocer-, and dimethacrylate-based RBCs at the bottom surface of the RBC and in the pulp chamber roof dentin (PCRD) during curing.


METHODS
In part A, temperatures were measured for Filtek LS (3M ESPE, St. Paul, MN, USA), Admira (Voco GmbH, Cuxhaven, Germany), and Herculite XRV (Kerr Corp., Orange, CA, USA) with a high-power light-emitting diode (LED) unit by placing thermocouples in contact with the bottom surface of the material in standardized acrylic molds. In part B, temperature changes in PCRD were measured in extracted molars during light-curing of adhesives and RBCs in 2-mm-deep cavities with a remaining dentin thickness (RDT) of 1 mm.


RESULTS
Filtek LS showed a different temperature curve compared with Admira and Herculite XRV. Significantly higher temperatures were recorded for Filtek LS (p < 0.001) than for Admira and Herculite XRV in acrylic molds. Temperature rises recorded in PCRD for adhesives and RBCs were between 4.1 and 6.4 degrees C. No significant differences in PCRD temperatures were found between the three groups during adhesive curing and RBC curing (p > 0.05).


CONCLUSIONS
Filtek LS showed a different heat-generation pattern from and significantly higher temperatures than Admira and Herculite XRV when the materials were tested in acrylic molds. Similar temperatures were recorded in the PCRD during curing of adhesives and RBCs.


CONCLUSIONS
Although a substantial temperature rise in the bulk material occurred during light-curing of the three resin-based composites, a remaining dentin thickness of 1 mm caused a significant reduction in pulp chamber roof dentin temperatures. Temperatures measured in the pulp chamber roof dentin corresponding to the zone occupied by the postmitotic odontoblast layer were not statistically different for the three types of resin-based composites.
Edinburgh Postgraduate Dental Institute, The University of Edinburgh, Lauriston Place, Edinburgh, UK. vesna.miletic@gmail.com
Vesna
V
Miletic
Vladimir
V
Ivanovic
Bojan
B
Dzeletovic
Maja
M
Lezaja
D000704:Analysis of Variance; D001831:Body Temperature / Q000502:physiology; D002516:Ceramics / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000737:chemistry / Q000502:physiology*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000379:methods*; D008689:Methacrylates / Q000737:chemistry; D008964:Molar, Third; D063225:Organically Modified Ceramics; D012821:Silanes / Q000737:chemistry; D062047:Silorane Resins; D018709:Statistics, Nonparametric; D013696:Temperature
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D063225:Organically Modified Ceramics; D012821:Silanes; D062047:Silorane Resins