J Korean Acad Conserv Dent.  2006 Sep;31(5):344-351. 10.5395/JKACD.2006.31.5.344.

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

• Jeon KA
• Lee IB
• Bae KS
• Lee WC
• Baek SH

• KMID: 1986877
• DOI: http://doi.org/10.5395/JKACD.2006.31.5.344

Abstract

The purpose of this study was to evaluate the thermal expansion characteristics of injectable thermoplasticized 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 25degrees C to 75degrees C. From the change of specimen length as a function of temperature, the coefficients of thermal expansion were determined. There was no statistical difference between four materials in the thermal expansion in the range from 35degrees C to 55degrees C (p > 0.05). However, Obtura Gutta-percha showed smaller thermal expansion than Diadent and Metadent ones from 35degrees C to 75degrees C (p < 0.05). The thermal expansion of Epiphany was similar to those of the other gutta-percha groups.

Keyword

Thermal expansion; Gutta-percha; Resilon; Dilatometer; Temperature

MeSH Terms

Ceramics
Dental Pulp Cavity*
Fungi
Gutta-Percha
Heating
Hot Temperature
Needles
Root Canal Filling Materials*
Syringes
Thermometers
Ceramics
Gutta-Percha
Root Canal Filling Materials

Figure

• 

  Figure 1 The mean dimensional volume change of four materials as a function of temperature at the range of 25℃ - 75℃.

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