A STUDY FOR THERMAL CONDUCTIVITY OF IRRADIATED CAVITY

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Journal of the Korean Academy of Pediatric Dentistry 1998;25(3):583-597.
Published online August 31, 1998.

A STUDY FOR THERMAL CONDUCTIVITY OF IRRADIATED CAVITY

와동내에 조사된 열의 전도양상에 관한 연구

백병주, 김재곤, 허선, 이두철, 윤현두

전북대학교 치과대학 소아치과학교실 및 치의학연구소

Abstract

The purpose of this study was to evaluate temperature change occurred in enamel, dentin and pulp due to the heat from cavity prepration with laser. We made three models had different cavity depth: cavity depth of model A was 3.52mm, model B was 2.32mm, model C was 1.16mm. We irradiated cavity base with thermal capacity of 30J,100J,300J/cm²s during few seconds and studied the change of temperature in tooth during 10 seconds, and estimated change of thermal capacity by different irradiated site and exposure time. At 300J/cm² irradiation for 2 seconds, the temperature of irradiated surface was elevated fast according to irradiated thermal energy during 1 second. In proportion to continuous exposure time, temperature elevated slowly. The surface temperature was 1370℃. After discontinue of thermal irradiation, the heat of irradiated surface was diffused in dentin and pulp and the greatest temperature was made. The greatest temperature was disappeared within 10 seconds The greatest temperature of the inner part of model brought about very severe change by different depth. Temperature in pulp was raised by the greater irradiated energy density and exposure time.

Key Words: thermal conductivity, laser, thermal temperature, cavity depth