Development of Expansive Temporary Sealing Material
| Autor: | SUGASHIMA, Shoei |
|---|---|
| Jazyk: | japonština |
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | 奥羽大学歯学誌. 31(2):143-155 |
| Popis: | P(論文) The aim of this study was to develop a temporary cavity sealing material possessing many of the properties long desired in conventional sealing materials. The basic composition of the experimental materials was designed to employ polyethylmethacrylate as well as aluminosilicate glass for the powder and eugenol for the liquid. The tannin-fluoride compound HY agent was incorporated as a modifier to improve the basic material. The experimental materials were evaluated for cytotoxicity, setting time, water absorption, dimensional change, recovery rate of compressed strain, and amount of fluoride released, and were subjected to microscopic observation. The results were as follows: 1. When assessed for cytotoxicity, the number of cells surviving in the material containing 10% HY agent was approximately 2.7 times greater than that in zinc oxide eugenol cement, which was the positive control. 2. The setting time of the group containing 2% HY agent was comparable to that of the control group. 3. Water absorption of the group containing 2% HY agent hardly differed from that of the control group, although it increased with HY content. 4. For dimensional change, all groups containing HY agent showed significantly more expansion than the control group. 5. Elastic recovery of strain in the HY-2, HY-4 and HY-6 groups was comparable to that observed in the control group at of 1, 3, and 5 minutes. 6. The amount of fluoride eluted from the HY-2 group was approximately 20 times higher than that from the control group after one day and was approximately 4 times higher after seven days. 7. Microscopic observation of the HY-2 group revealed no significant differences in surface configuration between the specimens before and after stored in artificial saliva for one week. SEM observation revealed granular particles in the control group and also reaction products derived from HY agent in the experimental groups. Based on the present results, it was concluded that an experimental sealing material containing 2% HY agent would be most appropriate for clinical applications. |
| Databáze: | OpenAIRE |
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