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KMID : 0362320010260050387
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Journal of Korean Academy of Operative Dentistry
2001 Volume.26 No. 5 p.387 ~ p.392
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INTRAPULPAL TEMPERATURE CHANGE OF GLASS IONOMER ACCORDING TO LIGHT CURING INTENSITY AND CURING TIME
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Abstract
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When cavity floor is near the pulp, polymerization of light-activated restorations results in temperature increase.
this temperature increase cause by both the exothermic reaction process and the energy absorbed during irradiation.
Therefore inslating base is reqired. Most frequently used insulating base is glass ionmer.
The purpose of this study was to evaluate intrapulpal temperature changes of glass ionomer according to various curing intensity and curing time.
Caries and restoration-free mandibular molars extracted within three months were prepared Class I cavity of 3 X 6mm with high speed handpiece. lmm depth of dentin was evaluated with micrometer in mesial and distal pulp horns. Pulp chambers were filled with 37.0±0.1℃ water to CEJ.
Chromium-alumina thermocouple was placed in pulp horn for evaluating of temperature changes. glass ionomer material was placed in 2mm. total curing time was 40s: continuous 40s, intermittent 20s, intermittent 1Os.
Glass ionomer material was cured with 300mW/c㎠, 550mW/㎠ light curing unit.
The results were as follows:
1. Temperature in pulp increased as curing unit power is increased.
2. Temperature in pulp more increased continuous emission than intermittent emission.
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