Brazilian gutta-percha points. Part II: thermal properties

This study was undertaken to explore the effect of heating on gutta-percha, analyzing the occurrence of endothermic peaks corresponding to the transformation that occurs in the crystalline structure of the polymer during thermal manipulation. This study also sought to determine the temperature at wh...

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Bibliographic Details
Published in:Brazilian oral research 2007, Vol.21 (1), p.29-34
Main Authors: Maniglia-Ferreira, Cláudio, Gurgel-Filho, Eduardo Diogo, Silva, Jr, João Batista Araújo, Paula, Regina Célia Monteiro de, Feitosa, Judith Pessoa Andrade, Gomes, Brenda Paula Figueiredo de Almeida, Souza-Filho, Francisco José de
Format: Article
Language:English
Subjects:
Brazil
Calorimetry, Differential Scanning
Dentistry
DENTISTRY, ORAL SURGERY & MEDICINE
Differential Thermal Analysis
Gutta-Percha - chemistry
Materials Testing
Root Canal Therapy
Statistics, Nonparametric
Surface Properties
Temperature
Thermodynamics
Thermogravimetry
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Summary:This study was undertaken to explore the effect of heating on gutta-percha, analyzing the occurrence of endothermic peaks corresponding to the transformation that occurs in the crystalline structure of the polymer during thermal manipulation. This study also sought to determine the temperature at which these peaks occur, causing a transformation from the beta- to the alpha-form, and from the alpha- to the amorphous phase. Eight nonstandardized gutta-percha points commercially available in Brazil (Konne, Tanari, Endopoint, Odous, Dentsply 0.04, Dentsply 0.06, Dentsply TP, Dentsply FM) and pure gutta-percha (control) were analysed using differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA). The transition temperatures were determined and analysed. With the exception of Dentsply 0.04 and Dentsply 0.06, the majority of the products showed thermal behaviour typical of beta-gutta-percha, with two endothermic peaks, exhibiting two crystalline transformations upon heating from ambient temperature to 130 degrees. Upon cooling and reheating, few samples presented two endothermic peaks. It was concluded that heating dental gutta-percha to 130 degrees C causes changes to its chemical structure which permanently alter its physical properties.
ISSN:1806-8324
1807-3107
1806-8324
DOI:10.1590/s1806-83242007000100005