구치용(臼齒用) 복합(複合)레진의 유동성(流動性) 및 용적변화(容積變化)에 관(關)한 연구(硏究)

A STUDY ON THE FLOW AND DIMENSIONAL CHANGE OF POSTERIOR COMPOSITE RESINS

The purpose of this study was to measure the free flow of the unpolymerized resin by its weight for 10 minutes by one minute interval, and to measure the dimensional change of composite resins during the irradiation of visible light(Quich light VL-l Kuraray Japan) using visible leser displacement meter(LC-2210 Kerence Japan). The unpolymerized resin was cured by the visible light for 40 seconds, the dimensional change was measured at the begining of irradiation for 5 minutes. The results were as follows : 1. In free flow LFI was the largest, BLI was the smallest at $23^{\circ}C$ and CFP was the largest, and BL was the smallest at $37^{\circ}C$. 2. In dimensional change CFI, LFP, LEI and CFP was excessively contracted flow the begining of irradiation until 15 seconds but BLI and BL was excessively contracted until 30 seconds BL and BLI in dimensional change was much larger than LFI and CFP.