Abstract
A study was made of interpulpal the rmal changes of various restorations, under the rmal irritations applied externally, with the use of a 2-dimensional steady state heart conductive analysis following the finite element method.
The results obtained were as follows:
1. No marked differences were found between the interpulpal the rmal changes of the inlay and amalgam restorations with the same cavity depth. Interpulpal the rmal changes of the metal crown were slightly higher than those of the natural tooth.
2. An insulation effect of cement bases in the inlay cavity was increased, as the cement base became thicker and the the rmal conductivity of cement became lower.
3. Secondary dentin 0.5mm in thickness was significantly effective for decrease of interpulpal the rmal changes.
4. A temporary resin crown and ZOE cement dressing in the inlay cavity provided a most favorable treatment for the protection from the rmal irritation.
5. When temperatures externally applied to various restored teeth were adjusted toward body temperature in 3°C-7°C, interpulpal the rmal changes of those specimens bacame favorable, as compared with interpulpal the rmal changes of the natural tooth.
6. The rmal irritation during desiccation was more, influential to the prepared teeth than during reversible hydrocolloid impression.
7. Marked interpuipal the rmal changes were found during polymerization of a temporary resin crown made by a direct method.
