탄성 고무인상재의 접촉각이 작업모형 표면에 미치는 영향
Study on the Effect of Contact Angles of Elastic Rubber Impression Materials on the Surface of Working Cast
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This study was begun to search effect of contact angles of elastic rubber impression materials on the surface of working cast. Of elastic rubber impression materials with a Type III consistency, such as polysulfide, polyether and addition silicone, we selected one and then measured the contact angle after dripping a distilled water 3.3ml. Then, after pouring a dental anhydrite in three types of impression materials, we prepared a working cast and then examined its surface. Contact angle was measured using a full automatic contact angle measuring system (DM-700, KYOWA, Japan),and the surface of working cast was observed using a field emission scanning electron microscope (JSM-6700F, JEOL Ltd., JAPAN). The following results were obtained: 1) Mean±SD (SD: standard deviation) of the initial contact angles were 91.3±20.5o in the addition silicone materials, 90.0±2.2o in the polyethers and 101.5±2.3o in the polysulfides. These results indicate that mean values were similar but standard deviations of the three materials showed a great discrepancy. 2) As the time elapsed, addition silicone materials were found to have a contact angle decreased abruptly as compared with the remaining two types. That is, the initial contact angle was 91.3o and it was abruptly decreased to 29.4o after 25seconds. 3) In the polyethers, the initial contact angle was 101.5o and it was decreased to 90.7o after 25 seconds. In the polysulfides, however, the initial contact angle was 90.0o and it was 84.2o after 25 seconds. This showed almost no changes in the initial contact angles. Moreover, its magnitude was greater than that seen in additional silicones. 4) There were significant differences in the contact angles between the three types of elastic rubber impression materials as the time elapsed (p<0.001). On an observation on the surface of working cast, addition silicone materials were found to have the most dense surface. This was followed by polysulfides and polyethers in a descending order.
Abstract
This study was begun to search effect of contact angles of elastic rubber impression materials on the surface of working cast. Of elastic rubber impression materials with a Type III consistency, such as polysulfide, polyether and addition silicone, we selected one and then measured the contact angle after dripping a distilled water 3.3ml. Then, after pouring a dental anhydrite in three types of impression materials, we prepared a working cast and then examined its surface. Contact angle was measured using a full automatic contact angle measuring system (DM-700, KYOWA, Japan),and the surface of working cast was observed using a field emission scanning electron microscope (JSM-6700F, JEOL Ltd., JAPAN). The following results were obtained: 1) Mean±SD (SD: standard deviation) of the initial contact angles were 91.3±20.5o in the addition silicone materials, 90.0±2.2o in the polyethers and 101.5±2.3o in the polysulfides. These results indicate that mean values were similar but standard deviations of the three materials showed a great discrepancy. 2) As the time elapsed, addition silicone materials were found to have a contact angle decreased abruptly as compared with the remaining two types. That is, the initial contact angle was 91.3o and it was abruptly decreased to 29.4o after 25seconds. 3) In the polyethers, the initial contact angle was 101.5o and it was decreased to 90.7o after 25 seconds. In the polysulfides, however, the initial contact angle was 90.0o and it was 84.2o after 25 seconds. This showed almost no changes in the initial contact angles. Moreover, its magnitude was greater than that seen in additional silicones. 4) There were significant differences in the contact angles between the three types of elastic rubber impression materials as the time elapsed (p<0.001). On an observation on the surface of working cast, addition silicone materials were found to have the most dense surface. This was followed by polysulfides and polyethers in a descending order.
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