Alpha- and beta-forms of gutta-percha in products for root canal filling.
Int Endod J
; 34(6): 447-51, 2001 Sep.
Article
in En
| MEDLINE
| ID: mdl-11556511
ABSTRACT
AIM:
This study was undertaken to evaluate which materials were in the alpha-form of gutta-percha as claimed, and which were in the more conventional beta-form, and to explore the effect of heating on the materials.METHODOLOGY:
Samples of gutta-percha without chemical additives, and dental gutta-percha formulations which included (i) two products previously studied; (ii) 12 newer products; and (iii) one newer product that had been stored at high temperature, were analysed by simultaneous differential thermal analysis and thermogravimetry.RESULTS:
It was found that only four of the newer materials contained the alpha-form; all the rest comprised beta-gutta-percha. No weight loss was found for any material under the conditions of the present experiments. A typical heating cycle up to 130 degrees C caused changes in material behaviour - that is, on reheating fewer endothermic peaks were present. Storage of gutta-percha samples for 10 years under ambient temperature and storage in a heater at 80 degrees C appeared to have no effect on properties.CONCLUSIONS:
It was concluded that heating dental gutta-percha to 130 degrees C causes physical changes; this was not seen with chemically pure gutta-percha. The presence of additives in the dental samples altered material behaviour.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Gutta-Percha
Language:
En
Journal:
Int Endod J
Year:
2001
Document type:
Article
Affiliation country:
United States