Volatilization of components from and water absorption of polyether impressions
Volatilization of components from and water absorption of polyether impressions
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DOI：
10.1016/j.jdent.2005.05.003
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发表时间：
2006-02-01
影响因子：
4.4
通讯作者：
Endo, T
中科院分区：
文献类型：
--
作者：
Kanehira, M;Finger, WJ;Endo, T
目的：为了评估在0、50或100%相对湿度下长期储存后，聚醚印模材料和乙烯基聚硅氧烷参考材料印模所产生的石模的准确性。（P2L/H; Heraeus Kulzer）和Impregum（IML/H; 3 M ESPE）和乙烯基聚硅氧烷的结晶时间（FLL/H; Heraeus Kulzer）从圆柱形托盘中的截头钢主锥中获得，在突出齿处具有4 mm的层厚度。在23 ° C下进行浸渍，并在23 ° C和0、50或100%RH下储存1、2、3、4或5天后浇注石模。准确度被确定为与主锥和石模精确配合的钢环之间的差异，并表示为基础直径偏差Δ d（μ m）。结果：P2 L/H随贮藏时间和湿度的增加而显著增加（30-240 μ m）（p <0.05）。在0%RH下，IML/H的模具扩大了90 - 180 μ m，在50%RH下，最大直径增加了60 μ m，在100%RH下储存时，所有模具都小了25-120 μ m（p < 0.05）。从FLL/H模具显示最大的广告偏差（55至-10 μ m）。结论：P2的印象释放挥发性物质在存储过程中，最好是倒在小于24小时。Impregum吸收水分，应储存在< 50%的湿度下。储存时间或环境湿度几乎不影响恒温时间的准确性。(c)2005爱思唯尔有限公司保留所有权利。
Objective: To evaluate the accuracy of stone dies produced from impressions with polyether impression materials and a vinyl polysiloxane reference material after prolonged storage at 0, 50, or 100% relative humidity.Methods: Impressions were taken with light and heavy-bodied types of the polyethers P2 (P2L/H; Heraeus Kulzer) and Impregum (IML/H; 3M ESPE) and vinyl polysiloxane Flexitime (FLL/H; Heraeus Kulzer) from a truncated steel master cone in cylindrical trays giving 4 mm layer thickness at the prominence tine. Impressions were taken at 23 degrees C, and stone dies were poured after 1, 2, 3, 4, or 5 days storage at 23 degrees C and 0, 50, or 100% RH. Accuracy was determined as discrepancy between a steel ring with accurate fit on the master cone and the stone die and expressed as base diameter deviation Delta d (mu m). One-way ANOVA and Duncan's post-hoc test were used for statistical data analysis (p < 0.05).Results: P2L/H showed significant Delta d increase (30-240 mu m) depending on storage time and humidity (p < 0.05). Dies from IML/H at 0% RH were 90 through 180 mu m enlarged, at 50% RH the maximum diameter increase was 60 mu m, and at storage in 100% RH all dies were 25-120 mu m smaller (p < 0.05). Dies from FLL/H showed maximum Ad deviations (55 to -10 mu m).Conclusions: P2 impressions release volatile substances during storage and should preferably be poured within less than 24 h. Impregum absorbs water and should be stored at < 50% humidity. The accuracy of Flexitime is scarcely affected by storage time or by ambient humidity. (c) 2005 Elsevier Ltd. All rights reserved.