Temperature rise during photo-polymerization for onlay luting.
OBJECTIVE
(1) To measure the temperature rise during long-time irradiation needed to lute adhesive indirect restorations, with one halogen and five LED high-power lamps, in a simulated oral environment, and (2) to propose a technique to reduce heat.


METHODS
Temperature within the pulp chamber of an extracted human molar in a 35 degrees C water bath, before and after restoration with a ceramic onlay, was continuously recorded during 3 x 120 seconds of irradiation for different curing regimens, with and without cooling by compressed air, water and water spray. Temperature rise in a thermo-insulated well was also measured during 120 seconds of irradiation with LEDemetron II and TuTu.


RESULTS
Maximal temperature rise of 6.2 degrees C/7.7 degrees C on intact/onlay restored tooth was found after 3 x 120 seconds of irradiation. Compressed air application reduced the temperature by 4 degrees C for LEDemetron II, while water spray increased the temperature by 15.1 degrees C for TuTu. Temperature decreased with irradiation distance, except for LEDemetron II. Air was heated up to 65 degrees C after 120 seconds of irradiation in an insulated well with TuTu.
School of Dentistry, University of Geneva, Rue Barthélemy-Menn 19, CH-1205 Geneva, Switzerland. iona.onisor@unige.ch
Ioana
I
Onisor
Erik
E
Asmussen
Ivo
I
Krejci
D000328:Adult; D000336:Aerosols; D000388:Air; D001831:Body Temperature / Q000528:radiation effects*; D002484:Cementation / Q000379:methods*; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects; D055117:Curing Lights, Dental / Q000145:classification; D003776:Dental Porcelain; D003782:Dental Pulp / Q000528:radiation effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry / Q000528:radiation effects*; D006801:Humans; D007284:Inlays; D055115:Light-Curing of Dental Adhesives; D055668:Photochemical Processes; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry / Q000528:radiation effects*; D013821:Thermometers; D013997:Time Factors; D014867:Water
D000336:Aerosols; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C078484:Syntac dentine adhesive; C090969:Tetric; D014867:Water; D003776:Dental Porcelain