광중합 시 수종의 심미적 수복재와 이장재의 사용에 따른 치수내 온도변화
TEMPERATURE CHANGES IN THE PULP ACCORDING TO VARIOUS ESTHETIC RESTORATIVE MATERIALS AND BASES DURING CURING PROCEDURE
장혜란, 이형일, 이광원, 이세준,
소속 상세정보
장혜란 ( ) - 전북대학교 치과대학 치과보존학교실
이형일 ( ) - 전북대학교 치과대학 치과보존학교실
이광원 ( ) - 전북대학교 치과대학 치과보존학교실
이세준 ( ) - 전북대학교 치과대학 치과보존학교실
KMID : 0362320010260050393
Abstract
Polymerization of light-activated restorations results in temperature increase caused by both the exothermic reaction process and the energy absorbed during irradiation. Within composite resin. temperature increases up to 20℃ or more during polymerization. But, insulation of hard tissue of tooth lowers this temperature increase in pulp. However, many clinicians are concerned about intrapulpal temperature injury. The purpose of this study was to evaluate temperature changes in the pulp according to various restorative materials and bases during curing procedure.
Caries and restoration-free mandibular molars extracted within three months were prepared Class I cavity of 3 x 6mm with high speed handpiece fissure bur. 1 mm 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 below restorative materials for evaluating of temperature changes. This thermocouple was connected to temperature-recording device (Multifunction analyzer MX, 6.000, JAPAN). Temperature changes was evaluated from initial 37.0℃ after temperature changes to 37.0℃. Tip of curing unit was placed in the center of prepared cavity separated lmm from restorative materials. Curing time was 40s. The restorative materials were used with Z 100, Fuji Ⅱ LC, Compoglass flow and bases were used with Vitrebond, Dycal. Restorative materials were placed in 2mm. The depth of bases were formed in lmm and in this upper portion, resin of 2mm depth was placed. This procedure was per-formed 10 times.
The results were as follows:
1. All the groups showed that the temperature in pulp increased as curing time inceased
2. The temperature increase of glass ionomer was significantly higher than that of Resin and Compomer during curing procedure (P<0.05).
3. The temperature increase in glass ionomer base was significantly higher than that of Calcium hydroxide base during Resin curing procedure (P<0.05).
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