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http://dx.doi.org/10.5395/JKACD.2006.31.5.344

Measurement of thermal expansion characteristic of root canal filling materials : Gutta-percha and Resilon  

Jeon, Kyung-A (Department of Conservative Dentistry, Anam Hospital, Korea University Medical Center)
Lee, In-Bog (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Bae, Kwang-Shik (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Lee, Woo-Cheol (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Baek, Seung-Ho (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Publication Information
Restorative Dentistry and Endodontics / v.31, no.5, 2006 , pp. 344-351 More about this Journal
Abstract
The purpose of this study was to evaluate the thermal expansion characteristics of injectable ther-moplasticized gutta-perchas and a Resilon. The materials investigated are Obtura gutta-percha, Diadent gutta-percha, E&Q Gutta-percha Bar and Epiphany (Resilon). The temperature at the heating chamber orifice of an Obtura II syringe and the extruded gutta-percha from the tip of both 23- and 20-gauge needle was determined using a Digital thermometer. A cylindrical ceramic mold was fabricated for thermal expansion test, which was 27 mm long, with an internal bore diameter of 3 mm and an outer diameter of 10 mm. The mold was filled with each experimental material and barrel ends were closed with two ceramic plunger. The samples in ceramic molds were heated in a dilatometer over the temperature range from $25^{\circ}C$ to $75^{\circ}C$. From the change of specimen length as a function of temperature, the coefficients of thermal expansion were deter-mined. There was no statistical difference between four materials in the thermal expansion in the range from $35^{\circ}C$ to $55^{\circ}C$ (p > 0.05). However, Obtura Gutta-percha showed smaller thermal expansion than Diadent and Metadent ones from $35^{\circ}C$ to $75^{\circ}C$ (p < 0.05). The thermal expansion of Epiphany was similar to those of the other gutta-percha groups.
Keywords
Thermal expansion; Gutta-percha; Resilon; Dilatometer; Temperature;
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