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Temperature-dependent rheological property changes of thermoplastic gutta-percha root filling materials.
- Source :
-
International Endodontic Journal . Jun2015, Vol. 48 Issue 6, p556-563. 8p. 1 Diagram, 3 Charts, 2 Graphs. - Publication Year :
- 2015
-
Abstract
- Aim To compare the penetration resistance ( PR) of six thermoplastic gutta-percha ( GP) materials against needle penetration at different temperatures. Methodology The PR of the following materials based on warm gutta-percha techniques, Beefill GP Cartridge (Beefill), GP Obturator-Hard/Medium/Soft (Dia-H, Dia-M, Dia-S), Obtura (Obtura) and Tactendo Gutta (Tactendo), was measured as a function of temperature change (from 30 °C to 200 °C). The PR was measured using a force gauge, mounted on a motor-driven micrometre stage, which pushed the penetration needle against GP in a glass cylinder at the designated temperatures. Data were analysed using Kruskal-Wallis anova and Duncan's multiple range tests at 5% significance. Results The mean PR values for all assessed materials ranged from 15.55 MPa to 26.02 MPa at 30 °C, decreased to 0.18-1.61 MPa at 60 °C, and finally reached 0.02-0.12 MPa at 200 °C. The Obtura had the highest PR values at most of the measured temperatures. At 40-60 °C, Obtura had the highest PR value ( P < 0.05), and Tactendo had the lowest amongst the tested materials. At 70-200 °C, both the mean PR values and melt flow temperature ( MFR) of Obtura, Dia-H and Dia-M were significantly higher than those of other materials ( P < 0.05). Conclusions The PR values were changed by both the heating temperature and the brand or type of GP materials tested. Each material was associated with drastic decreases before reaching 60 °C in different degrees, and Obtura had the highest PR at most of the measured temperatures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01432885
- Volume :
- 48
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- International Endodontic Journal
- Publication Type :
- Academic Journal
- Accession number :
- 102580177
- Full Text :
- https://doi.org/10.1111/iej.12349