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HOME > Restor Dent Endod > Volume 35(4); 2010 > Article
Basic Research An evaluation of rotational stability in endodontic electronic motors
Se-Hee Park1, Hyun-Woo Seo2, Chan-Ui Hong3
2010;35(4):-256.
DOI: https://doi.org/10.5395/JKACD.2010.35.4.246
Published online: July 31, 2010

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Corresponding Author: Se-Hee Park. Department of Conservative Dentistry College of Dentistry, Gangneung-Wonju National University, 123 Chibyon-dong Gangwon-do, Korea. Tel: +82-33-640-2760 Fax: +82-33-640-3103, drendo@gwnu.ac.kr
• Received: April 28, 2010   • Revised: May 12, 2010   • Accepted: June 11, 2010

Copyright © 2010 Korean Academy of Conservative Dentistry

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  • The purpose of this study was to evaluate a rotational stability of endodontic electronic motors by comparing the changes of rotational speed, depending on the number of usages and with/without static load. Twelve new endodontic electronic motors were used in this study. Non contact type digital tachometer was used for measuring the rotational speed of handpiece. True RMS Multimeter was used for measuring the voltages and the electric currents. All measurements were recorded every 10 seconds during 10 minutes and repeated 9 times. Five repetition was done per each electronic motor. To statistical analysis, student t-test, repeated measures and Scheffe's post-hoc tests were performed. In the same motor group, there was no significant difference in all measurements. In all groups, there was no significant difference in the amount of rotational speed changes depending on the number of usages and with/without static load. In the limitation of this study, the results showed that all kinds of endodontic electronic motors in this study had an established rotational stability. Therefore they could be safely used in root canal treatment with a reliable maintenance of rotational speed, regardless of the number of usages and with/without load.
  • Keywords: Rotational stability; Electronic motor; Rotational speed; RPM; Endomate TC; X-Smart
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Figure 1
Diagram of measuring method.
a: Measurement of TECNIKA and AEU-25, under the unloading condition.
b: Measurement of TECNIKA and AEU-25, under the loading condition.
c: Measurement of X-Smart and Endomate TC, under the unloading condition.
d: Measurement of X-Smart and Endomate TC, under the loading condition.
jkacd-35-246-g001.jpg
Figure 2
Actual rotational speed (rpm) of each electronic motors.
horizontal axis: The number of measuring times (× 10 seconds), vertical axis: Rotational speed (RPM).
a: Actual rotational speed of TECNIKA, under the unloading condition.
b: Actual rotational speed of TECNIKA, under the loading condition.
c: Actual rotational speed of AEU-25, under the unloading condition.
d: Actual rotational speed of AEU-25, under the loading condition.
e: Actual rotational speed of X-Smart (AC adapter), under the unloading condition.
f: Actual rotational speed of X-Smart (AC adapter), under the loading condition.
g: Actual rotational speed of X-Smart (Battery), under the unloading condition.
h: Actual rotational speed of X-Smart (Battery), under the loading condition.
i: Actual rotational speed of Endomate TC, under the unloading condition.
j: Actual rotational speed of Endomate TC, under the loading condition.
jkacd-35-246-g002.jpg
Figure 3
Actual DC voltage (V) depending on repeated using.
a: X-Smart (AC adapter) under the unloading condition.
b: X-Smart (AC adapter) under the loading condition.
c: X-Smart (Battery) under the unloading condition.
d: X-Smart (Battery) under the loading condition.
e: Endomate TC under the unloading condition.
f: Endomate TC under the loading condition.
jkacd-35-246-g003.jpg
Figure 4
Actual DC current (mA) depending on repeated using.
a: X-Smart (AC adapter) under the unloading condition.
b: X-Smart (AC adapter) under the loading condition.
c: X-Smart (Battery) under the unloading condition.
d: X-Smart (Battery) under the loading condition.
e: Endomate TC under the unloading condition.
f: Endomate TC under the loading condition.
jkacd-35-246-g004.jpg
Table 1
Motor preset values and measured item

†P: Power supplied from AC adapter

††B: Power supplied from rechargeable battery

jkacd-35-246-i001.jpg
Table 2
Mean values (± standard deviation) of actual rotational speed

†P: Power supplied from AC adapter

††B: Power supplied from Rechargeable battery

Student t-test analysis, significantly different at p < 0.05.

The different letter means significant difference between groups.

jkacd-35-246-i002.jpg
Table 3
P-values in changes of rotational speed in same kind of motors

†P: Power supplied from AC adapter

††B: Power supplied from Rechargeable battery

Repeated measure analysis, significantly different at p < 0.05.

jkacd-35-246-i003.jpg
Table 4
Comparison of voltages and currents depending on repeated using and with/without loading

†P: Power supplied from AC adapter

††B: Power supplied from Rechargeable battery

Repeated measure analysis, significantly different at p < 0.05.

The different letter means significant difference between groups (p < 0.05).

jkacd-35-246-i004.jpg

Tables & Figures

REFERENCES

    Citations

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      An evaluation of rotational stability in endodontic electronic motors
      J Korean Acad Conserv Dent. 2010;35(4):246-256.   Published online July 31, 2010
      DOI: https://doi.org/10.5395/JKACD.2010.35.4.246
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    An evaluation of rotational stability in endodontic electronic motors
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    Figure 1 Diagram of measuring method. a: Measurement of TECNIKA and AEU-25, under the unloading condition. b: Measurement of TECNIKA and AEU-25, under the loading condition. c: Measurement of X-Smart and Endomate TC, under the unloading condition. d: Measurement of X-Smart and Endomate TC, under the loading condition.
    Figure 2 Actual rotational speed (rpm) of each electronic motors. horizontal axis: The number of measuring times (× 10 seconds), vertical axis: Rotational speed (RPM). a: Actual rotational speed of TECNIKA, under the unloading condition. b: Actual rotational speed of TECNIKA, under the loading condition. c: Actual rotational speed of AEU-25, under the unloading condition. d: Actual rotational speed of AEU-25, under the loading condition. e: Actual rotational speed of X-Smart (AC adapter), under the unloading condition. f: Actual rotational speed of X-Smart (AC adapter), under the loading condition. g: Actual rotational speed of X-Smart (Battery), under the unloading condition. h: Actual rotational speed of X-Smart (Battery), under the loading condition. i: Actual rotational speed of Endomate TC, under the unloading condition. j: Actual rotational speed of Endomate TC, under the loading condition.
    Figure 3 Actual DC voltage (V) depending on repeated using. a: X-Smart (AC adapter) under the unloading condition. b: X-Smart (AC adapter) under the loading condition. c: X-Smart (Battery) under the unloading condition. d: X-Smart (Battery) under the loading condition. e: Endomate TC under the unloading condition. f: Endomate TC under the loading condition.
    Figure 4 Actual DC current (mA) depending on repeated using. a: X-Smart (AC adapter) under the unloading condition. b: X-Smart (AC adapter) under the loading condition. c: X-Smart (Battery) under the unloading condition. d: X-Smart (Battery) under the loading condition. e: Endomate TC under the unloading condition. f: Endomate TC under the loading condition.

    Figure 1

    Figure 2

    Figure 3

    Figure 4

    An evaluation of rotational stability in endodontic electronic motors

    Motor preset values and measured item

    †P: Power supplied from AC adapter

    ††B: Power supplied from rechargeable battery

    Mean values (± standard deviation) of actual rotational speed

    †P: Power supplied from AC adapter

    ††B: Power supplied from Rechargeable battery

    Student t-test analysis, significantly different at p < 0.05.

    The different letter means significant difference between groups.

    P-values in changes of rotational speed in same kind of motors

    †P: Power supplied from AC adapter

    ††B: Power supplied from Rechargeable battery

    Repeated measure analysis, significantly different at p < 0.05.

    Comparison of voltages and currents depending on repeated using and with/without loading

    †P: Power supplied from AC adapter

    ††B: Power supplied from Rechargeable battery

    Repeated measure analysis, significantly different at p < 0.05.

    The different letter means significant difference between groups (p < 0.05).
    Table 1 Motor preset values and measured item

    †P: Power supplied from AC adapter

    ††B: Power supplied from rechargeable battery

    Table 2 Mean values (± standard deviation) of actual rotational speed

    †P: Power supplied from AC adapter

    ††B: Power supplied from Rechargeable battery

    Student t-test analysis, significantly different at p < 0.05.

    The different letter means significant difference between groups.

    Table 3 P-values in changes of rotational speed in same kind of motors

    †P: Power supplied from AC adapter

    ††B: Power supplied from Rechargeable battery

    Repeated measure analysis, significantly different at p < 0.05.

    Table 4 Comparison of voltages and currents depending on repeated using and with/without loading

    †P: Power supplied from AC adapter

    ††B: Power supplied from Rechargeable battery

    Repeated measure analysis, significantly different at p < 0.05.

    The different letter means significant difference between groups (p < 0.05).

    Table 1

    Table 2

    Table 3

    Table 4

    Restor Dent Endod : Restorative Dentistry & Endodontics
    © The Korean Academy of Conservative Dentistry.
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