와연형태에 따른 변연누출에 관한 실험적 연구
A Study on the Marginal leakage of Restorations with Different Cavosurface Margins
홍진교, 홍정표, 김정범, 황의환,
소속 상세정보
홍진교 ( ) - 경희대학교
홍정표 ( ) - 경희대학교
김정범 ( ) - 경희대학교
황의환 ( ) - 경희대학교
KMID : 0362319860120010119
Abstract
The purpose of this study was to evaluate the marginal leakage of glass ionomer cement with different cavosurface margins.
192 class V cavities were prepared on freshly extracted non-carious teeth and glass ionomer cement were inserted according to the manufacturer’s instructions.
Cavity preparations for this investigation were performed in four groups. The experimental specimens were made by packing the glass ionomer cement (Fuji Ionomer Type Ⅱ G-C Co. Japan into the prepared 192 cavities of four groups with different modes :
GroupⅠ- The 48 cavities with 90˚ butt-joint cavosurface preparation and restored with glass ionomer cement.
GroupⅡ - The 48 cavities with butt-joint preparation modified by 135˚ beveling the cavosurface in the dentin and restored with glass ionomer cement.
GroupⅢ - The 48 cavities with butt-joint preparation modified by cutting a chamfer in the dentin and restored with glass ionomer cement.
GroupⅣ - The same 48 cavities as group, I, and overfilled with glass ionomer cement beyond the cavosurface angle.
And four groups above described divided into three subgroups by means of conditioning the cavity walls :
Control group. - Glass ionomer cement filled in the prepared 64 cavities after being cleaned with a stream of tap water.
Phosphoric acid treatment group. - Glass ionomer cement filled in the prepared 64 cavities after being conditioned with a 50％ phosphoric acid.
Citric acid treatment group. - Glass ionomer cement filled in the prepared 64 cavities after being conditioned with a 50％ citric acid.
All 192 specimens were immersed in the 2.0％ basic fuchsin solution and subjected to thermal stress at one-minute intervals (4±2℃ to 60±2℃) for 70 minutes before exposure to the dye. The specimens were sectioned occlusogingivally through the center of the restorations for different periods of immersion time, 24 hours, 7 days, 14 days 30days. The sections were examined under a stereoscopic microscope.
The results were as follows :
1. The degree of marginal leakage in group Ⅱ and Ⅲ was greater than that in group Ⅰand Ⅳ.
2. The degree of marginal leakage in phosphoric acid treatment group was similar with that in control group.
3. The degree of marginal leakage in citric acid treatment group was less than that in control group.
4. In all groups, the degree of marginal leakage in phosphoric acid treatment group was greater than that in citric treatment group.
5. There is no statistical difference of the degree of marginal leakage according to the immersion time in the dye solution.
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