Restorative Dentistry and Endodontics
- Volume 11 Issue 1
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- Pages.77-88
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- 1985
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- 2234-7658(pISSN)
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- 2234-7666(eISSN)
A STUDY ON THE THERMAL DIFFUSION THROUGH VARIOUS THICKNESS OF BASE AND RESTORATION MATERIALS
수복물(修復物)과 양장재(襄裝材)의 열확산(熱擴散)에 관(關)한 연구(硏究)
- Yoon, Dong-Ho (Department of Operative, Division of Dentistry, Kyung Hee University) ;
- Park, Sang-Jin (Department of Operative, Division of Dentistry, Kyung Hee University) ;
- Min, Byung-Soon (Department of Operative, Division of Dentistry, Kyung Hee University) ;
- Choi, Ho-Young (Department of Operative, Division of Dentistry, Kyung Hee University)
- Published : 1985.12.31
Abstract
The purpose of this study was to examine the thermal diffusion through bases and restorations. The three principle types of base and two restorative materials were included in this study. They were representive brands of a zinc phosphate cement, a zinc oxide-eugenol cement, a calcium hydroxide paste, an amalgam and a composite resin (table 1). The specimens were prepared by placing the bases or restorative materials in laminated plastic molds. 5-mm diameter holes were prepared in the center of square of plastics which were 0.5, 1.0, 2.0, and 3.0mm thick respectively (fig. 1). All materials were manipulated in accordance with manufacturer's recommended proportions. All experimental procedures were carried out dividing them into eight different groups (table 2). Thermal diffusion was measured by means of digital thermometer (DP-100, RKC. instrument Inc. JAPAN) with the surface thermocouple placed on bottom surface of the specimen applying a constant source of heat and cold to the top surface of the each specimen. The thermal stimulus temperature applied on the each specimen surface was in the range of
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