Accuracy of spring-style and friction-style mechanical implant torque wrench

Dong-Hee Cha; Sang-Chun Oh

doi:10.4047/jkap.2016.54.1.8

Journal List > J Korean Acad Prosthodont > v.54(1) > 1034910

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Cha and Oh: Accuracy of spring-style and friction-style mechanical implant torque wrench

ORIGINAL ARTICLE

J Korean Acad Prosthodont 2016;54(1):8-13.

Published online: 18 December 2016

DOI: https://doi.org/10.4047/jkap.2016.54.1.8

Accuracy of spring-style and friction-style mechanical implant torque wrench

Dong-Hee Cha, Sang-Chun Oh^∗

Department of Prosthodontics, School of Dentistry, Wonkwang University, Daejeon, Republic of Korea

∗Corresponding Author: Sang-Chun Oh Department of Prosthodontics, College of Dentistry, Wonkwang University, 77 Doonsan-ro, Seo-gu, Daejeon 35233, Republic of Korea +82 42 366 1100: e-mail, scoh@wku.ac.kr

Received 11 December 20155 January 2016 Accepted 15 January 2016

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.

Abstract

Purpose

The aim of this study was to compare the accuracy of two different styles of mechanical implant torque wrenches before and after sterilization and repeated use.

Materials and methods

Thirty new spring-style and friction-style mechanical implant torque wrenches from five different manufacturers were selected as subjects of study and assessed in terms of accuracy. Three manufacturers produced, spring-style (Dio, Neobiotech, Osstem) torque wrenches, and other three manufactures produced friction-style (Dentium, Osstem, Shinhung) torque wrenches. The procedure of target torque measurement was performed 10 times for each device and a digital torque gauge (MGT-12, Mark-10 Corp, USA) was used to record the measurements. All torque wrenches were used repeatedly for 20 times and then sterilized. This whole procedure was repeated 100 times and all torque wrenches were retested. The collected data was analyzed using a SPSS Statistics Analysis program to evaluate the accuracy of the torque wrenches and Mann-Whitney-U test was used for a comparative analysis.

Results

After sterilization and repeated use procedure, results did not show any significant difference between error values in the spring-style torque wrench group. However, the results demonstrated an increase in error values within the friction-style torque wrench group (P<.05).

Conclusion

There was no difference between the accuracy of new spring-style torque wrenches before and after 100 cycles of sterilization and repeated use (P>.05). There was significant difference between the accuracy of new friction-style torque wrenches before and after 100 cycles of sterilization and repeated use (P<.05). Within the limitation of this study, spring-style torque wrenches were more accurate than friction-style torque wrenches in delivering target torque values. (J Korean Acad Prosthodont 2016;54:8-13)

Keywords: Implant torque wrench, Infection control, Sterilization, Repeated use

REFERENCES

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Fig. 1.

Spring-style mechanical torque wrenches (A: Dio, B: Osstem, C: Neobiotech).

Fig. 2.

Friction-style mechanical torque wrenches (A: Dentium, B: Osstem, C: Shinhung).

Fig. 3.

Digital torque gauge (MGT-12).

Fig. 4.

Digital torque gauge fixed with a vice for stability.

Fig. 5.

Mean value and standard deviation of difference between peak torque and target value before and after repeated use and sterilization cycle.

Fig. 6.

Rust and corrosion of moving part of torque wrench.

Fig. 7.

Lubricant remnants of spiral part of torque wrench.

Table 1.

Mechanical implant torque wrenches used in this study

Group		N	Target Torque value (Ncm)
Spring-style	DTW0060, Dio, Busan, Korea	5	35
	TW60, NeoBiotech, Seoul, Korea	5	30
	TW30B, Osstem, Seoul, Korea	5	30
Friction-style	XTW, Dentium, Yongin, Korea	5	30
	TW30, Osstem, Seoul, Korea	5	30
	TW00, Shinhung, Wonju, Korea	5	30

Table 2.

Summary data for accuracy measurements of each torque wrench style (Ncm)

Group	Mean ± SD		Minimum		Maximum		Median
Group	before	after	before	after	before	after	before	after
Spring	0.53 ± 0.22	0.59 ± 0.36	0.18	0.21	0.85	1.38	0.52	0.6
Friction	0.48 ± 0.23	2.14 ± 1.74	0.12	0.38	0.78	5.26	0.47	2.13

Table 3.

Comparison of difference between peak torque and target value between and within group by Mann-Whitney-U test

Within group	P	Between group	P
Sb (0.52) and Sa (0.6)	.51	Sb (0.52) and Fb (0.47)	.93
Fb (0.47) and Fa (2.13)	.00^∗	Sa (0.6) and Fa (2.13)	.005^∗

^∗ Significant at P<.05

Sb: Spring-style before test, Sa: Spring-style after test, Fb: Friction-style before test, Fa: Friction-style after test

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