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KMID : 1035320140410030223
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Korean Society for Dental Materials
2014 Volume.41 No. 3 p.223 ~ p.231
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Temperature Evaluation of Thermoplastic Gutta-percha Obturation Materials and Injection Gun Device by Infrared Thermographic Method
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Moon Hyun-Joo
Kim Min-Kang
Choi Hae-Rim
Kim Hae-Young
Song Ho-June
Park Young-Jun
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Abstract
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The temperatures of commercially available eight thermoplastic gutta-percha (GP) materials and different positions of injection gun were measured while the materials were extruded from the Obtura injection gun set at 160oC and 200oC. The complex viscosity values of the materials were evaluated at the designated temperatures. The in-situ temperatures were measured every 10 s for 30 s using an infrared thermal imaging camera. Calibration and reconstruction of the recorded images were performed by applying respective material emissivity values for each measured parts. Depending on the tested GP materials, mean temperature values of the extruded melts were ranged in 57.5-88.4oC at 160oC setting and 84.0-110.6oC at 200oC settings. Among the tested materials, the melt of Obtura showed the lowest melt temperature values at both temperature settings (p<0.05). The highest measured temperatures of the needle and needle-adapter parts of the injection gun were above 200oC during the 30 s from the beginning of triggering action. Based on these results, the temperatures of gutta-percha melts were changed by both the heating temperature and the brand or viscosity-type of tested materials. The injectable gutta-percha technique should be performed with caution when using the heated injection gun device.
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KEYWORD
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Complex viscosity, Emissivity, Infrared thermography, Injectable gutta-percha technique, Temperature
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