Temperature rise in the pulp chamber induced by a conventional halogen light-curing source and a plasma arc lamp.
OBJECTIVE
To assess and compare the pulp chamber temperature increase during resin-based composite polymerization with two different light-curing units.


METHODS
A Class I cavity was prepared in an extracted lower molar under standardized conditions using a specially designed industrial robot system. The dentin layer between the pulp chamber and the floor of the cavity was 1 mm thick. Pulp chamber temperature rises (starting temperature: 20.0 +/- 0.1 degrees C) were recorded for four different series of investigations using both the halogen curing lamp Elipar Visio (light-curing: 40 s) and the plasma arc lamp Apollo 95E (light-curing: 3 seconds): Group A: Operation of the light-curing units directly over the untreated, empty cavity; Group B: Resin-based composite polymerization without previously applied cement base or bonding agent; Group C: Resin-based composite polymerization with a previously applied cement base; Group D: Resin-based composite polymerization with a previously applied bonding agent. In each of the four groups 10 measurements were carried out for every light-curing unit. Data were statistically analyzed using ANOVA, post-hoc Scheffé test and t-test.


RESULTS
The lowest temperature increase (0.3 degrees C) was recorded during composite polymerization with a previously applied cement base using the Apollo 95E unit (Group C, P < 0.05). The highest temperature increase was induced when using the Elipar Visio unit directly over the untreated cavity (Group A, P < 0.05). In Groups A, C and D higher pulp chamber temperature measurements were obtained when using the Elipar Visio unit as compared to the Apollo 95E plasma arc lamp (P < 0.01). In Group B, no significant differences were recorded during the composite polymerization when using the two different light-curing units (P > 0.05).
Department of Orthodontics, University of Münster, Waldeyerstrasse 30, D-48149 Münster, Germany. siamak@uni-muenster.de
Gholamreza
G
Danesh
Hendrick
H
Davids
Sven
S
Duda
Markus
M
Kaup
Klaus
K
Ott
Edgar
E
Schäfer
D000704:Analysis of Variance; D001831:Body Temperature / Q000502:physiology*; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects; D003736:Dental Cavity Lining; D003737:Dental Cavity Preparation / Q000145:classification; D003786:Dental Pulp Cavity / Q000502:physiology*; D003804:Dentin / Q000502:physiology; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004867:Equipment Design; D006801:Humans; D008029:Lighting / Q000295:instrumentation*; D011108:Polymers / Q000737:chemistry / Q000528:radiation effects; D015036:Zinc Phosphate Cement / Q000737:chemistry
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011108:Polymers; D015036:Zinc Phosphate Cement