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Analysis of temperature rise on the root surface during continuous wave of condensation technique


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Analysis of temperature rise on the root surface during continuous wave of condensation technique

Article information

Restor Dent Endod. 2003;28(4):341-347
Publication date (electronic) : 2003 July 31
doi : https://doi.org/10.5395/JKACD.2003.28.4.341
Young-Ju Kim, Yun-Chan Hwang, Sun-Ho Kim, In-Nam Hwang, Bo-Young Choi#, Young-Jin Jeong#, Woo-Nam Juhng#, Won-Mann Oh
Department of Conservative Dentistry, College of Dentistry, DSRI, Chonnam National University, Korea.
#School of Mechanical Systems Engineering, Chonnam National University, Korea.
Corresponding author (wmoh@chonnam.ac.kr)

Abstract

This study was conducted to evaluate the temperature rise on the root surface while the root canal is being obturated using continuous wave of condensation technique. Maxillary central incisor was prepared for repeated canal obturation. Ten thermocouples (Omega Engineering Inc., Stanford, USA) were placed at 1 mm increment from the anatomical root apex. The real temperature of Buchanan plugger was recorded before insertion into the root canal. The root canal was obturated with continuous wave of condensation technique as described by Buchanan and the root surface temperature was recorded during obturation at 150℃, 200℃, 250℃ and 300℃ temperature settings of System B HeatSource (Model 1005, Analytic technologies, Redmond, WA, USA). After completion of the temperature recording, the dentinal-cementum thickness at each sites was measured. The data were analyzed using one-way ANOVA followed by Scheffe' s test and linear regression test.

The results were as follows.

  1. When the temperature was set at 150℃, 200℃, 250℃ and 300℃ on the digital display of System B HeatSource, the real temperature of the plugger at the 1mm point from the tip revealed 130.82±2.96℃, 158.00±5.26℃, 215.92±6.91℃ and 249.88±3.65℃ respectively.

  2. The position of 8 mm from the anatomical apex showed the highest temperature increase at each temperature settings and it was significantly higher than those of other positions (p<0.01). The temperature rise was constantly increased toward coronal portion from apex of the root.

  3. The maximum temperature increase on the root surface was 2.37±0.09℃ at 150℃ setting, 3.11±0.12℃ at 200℃ setting, 3.93±0.09℃ at 250℃ setting and 5.69±0.15℃ at 300℃ setting respectively.

These results suggest that it be relatively kind to the supporting tissues of the root that the root canal is obturated using continuous wave of condensation technique at 150℃, 200℃, 250℃ and 300℃ temperature settings on digital temperature display of System B HeatSource.

Keywords: Continuous wave of condensation technique; Thermocouple

References

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Article information Continued

Copyright © 2003 Korean Academy of Conservative Dentistry
(open-access) :

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Fig. 1

Fig. 1

Components of tooth model.

Fig. 2

Fig. 2

Diagram showing the placement of thermocouples on the root surface.

T1: 1 mm from the anatomical apex, T10: 10 mm from the anatomical apex.

Fig. 3

Fig. 3

Schematic illustration of the whole system.

Fig. 4

Fig. 4

Maximum temperature increase on the root surface.

Bar represents no significant difference between two temperature settings at the same site on the root surface.

Fig. 5

Fig. 5

Representative temperature rise at 8 mm from the anatomical apex of the root by time of measurement.

Table 1

Digital display of System B HeatSource vs real temperature at 1mm from the ML size Buchanana plugger tip (Mean±S.D.)

Table 1

Table 2

Maximum temperature increase on the root surface

Table 2

ΔT: Mean of maximum temperature increase, S.E.: Standard Error

T1: 1 mm from the anatomical apex

T10: 10 mm from the anatomical apex

Same character represents no significant difference between two sites at each temperature setting.

Table 3

The dentinal-cementum thickness of the root

Table 3

T1: 1 mm from the anatomical apex, T10: 10 mm from the anatomical apex.