Trial Production of Expansive Temporary Sealing Material : Marginal Sealing
| Autor: | NOGUCHI, Hiroshi, OKADA, Hidetoshi, ISHIDA, Yoshinori, KAKUMOTO, Yoshimi, OIKAWA, Hitoshi, FUKUI, Kazunori, NAGAYAMA, Katsuya |
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| Jazyk: | japonština |
| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | 奥羽大学歯学誌. 32(1):29-34 |
| Popis: | P(論文) The purpose of this study was to examine a marginal sealing potential of temporary sealing materials with an inflating property. Polyethylmethacrylate (PEMA) powder was used as a test material and the test liquid used was Eugenol. (PA). Commercially available resin temporary sealing material (RE) was used as a control. Human permanent mandibular molars were used as a sample in the marginal sealing test. After cavity preparation was performed on the occlusal surface, a temporary sealing material was embedded and the sample was preserved in water for 24 hours in a thermostat controlled at 37℃ and 100% relative humidity. The color penetration test was performed under the two conditions below : CO : Immersed for 10 or 30 minutes in 0.2 (basic fuchsine solution after preservation. TH : Following thermal cycling test repeated 100 times at 4℃ and 60℃ (30 seconds respectively) after preservation, immersed for 10 or 30 minutes in 0.2% basic fuchsine solution. Sagittal sections of individual samples were observed by means of microscope and the marginal sealing potential was evaluated based on the degree of color permeation per unit cavity wall. The degree of permeation thus evaluated was scored into 4 grades from 0 to 3. The following results were obtained. 1) When PA was compared with RE after 24 hour preservation in water followed by fuchsine immersion, permeation into the dentine was absent with PA but clearly observed with RE. Furthermore, the permeation capacity was augmented with prolonged times of immersion. 2) Though permeation into the dentine was evident with both PA and RE after thermal cycling test, the degree of permeation was rather lower with PA than RE. The influence of immersion time showed a similar trend to that observed after preservation in water for 24 hours. 3) PA was compared with RE, PA seemed to have better marginal sealing potential with smaller scores |
| Databáze: | OpenAIRE |
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