Changes of root surface temperature generated by different bypassing warm gutta-percha obturation methods

doi:10.3969/j.issn.2095-4344.2014.25.013

Abstract

Abstract:

BACKGROUND: Obturation with warm gutta-percha can achieve perfect three-dimensional root canal obturation effect. Due to specific structure of oval canal, particularly in the bypass preparation process, excessive cutting of local tooth tissue may lead to tooth tissue thinning and irregular shape. The separation equipment is the metal with good heat conduction, so the heat caused by the bypassing warm gutta-percha obturation would burn periodontal tissue remains controversial.
OBJECTIVE: To investigate the changes of root surface temperature produced by two bypassing warm gutta-percha obturation for the separation instrument in oval canal in vitro by using infrared thermography.
METHODS: Forty mandibular first premolars were harvested from oval canals, and were separated using stainless steel 15# K file at apical 3 mm, with the length of 3 mm. The root canal bypassing was prepared using TF nickel-titanium file under operating microscope. The teeth were randomly divided into two groups, with
20 teeth in each group, and were obturated with the Thermafil warm gutter-percha and E&Q plus warm gutta-percha vertical compaction, respectively. An infrared thermoviewer was used to measure the external root surface temperature before and after the obturation.
RESULTS AND CONCLUSION: Two warm gutta-percha obturation methods used for separating instruments bypassing in the oval root canal, had both caused the rise of root surface temperature, which was less than 10 ℃. In the Thermafil group, the temperature changes were 3.2-8.1 ℃ and the average change was 4.97 ℃. In the vertical condensation group, the temperature changes were 5.5-9.8 ℃ and the average change was 7.35 ℃. There were significant differences in the change of root surface temperature between the two groups (P < 0.05). Thermafil warm gutter-percha obturation would increase the root surface temperature, but cannot damage periodontal tissues. It is more secure than warm gutta-percha vertical condensation.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

全文链接：

Key words: tooth root, mouth, temperature

CLC Number:

R318

Qi Lu, Wang Xing, Wu Pei-ling. Changes of root surface temperature generated by different bypassing warm gutta-percha obturation methods[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(25): 4009-4013.

Figures/Tables 2

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