Effect of various abutment systems on the removal torque and the abutment settling in the conical connection implant systems

Jin-Seon Lee; Joon-Seok Lee

doi:10.4047/jkap.2012.50.2.92

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Lee and Lee: Effect of various abutment systems on the removal torque and the abutment settling in the conical connection implant systems

Original Article

The Journal of Korean Academy of Prosthodontics

The Journal of Korean Academy of Prosthodontics 2012; 50(2): 92-98.

Published online: 30 April 2012

DOI: https://doi.org/10.4047/jkap.2012.50.2.92

Effect of various abutment systems on the removal torque and the abutment settling in the conical connection implant systems

Jin-Seon Lee, DDS, MSD, Joon-Seok Lee, DDS, MSD, PhD

Department of Prosthodontics, School of Dentistry, Dankook University, Cheonan, Korea.

Corresponding Author: Joon-Seok Lee. Department of Prosthodontics, College of Dentistry, Dankook University, 7-1, Shinbu-dong, Cheonan, 330-716, Korea. +82 41 550 1865: joon322@dku.edu

Received 7 March 2012 Revised 2 April 2012 Accepted 16 April 2012

Abstract

Purpose

The aim of this study was to evaluate the effects of different abutment materials on abutment screw loosening and settling-down effect in conical connection type implant system.

Materials and methods

Three types of abutment, cementation, gold UCLA, and metal UCLA abutment were used. Two UCLA groups were fabricated in a similar pattern to cementation abutment. Type III gold alloy and Nickel-Chromium alloy was used for casting gold UCLA abutment and metal UCLA abutment, respectively. Fixture and abutment were tightened to 30 Ncm by using digital torque controller and re-tightening was conducted with same force after 10 minutes. Digital torque gauge was used to measure loosening torque and fixture/abutment length was measured by digital micrometer. Dynamic loads between 25 N and 250 N were applied with 0°angle to the abutment axis. After loading, fixture/abutment length was re-measured and amount of settlement was calculated. Loosening torque value was also measured for comparison.

Results

All three groups showed significant differences of length when comparing before and after loading, but there was no significant difference of settling amount in all groups. Loosening torque values were significantly decreased when comparing before and after loading in all groups(P<.05). However, there was no significant difference in loss of loosening torque values when compared to groups.

Conclusion

In internal conical connection type implants, dynamic load affected on settlement and loosening torque of implant, but there was no differences between abutments materials. Likewise gold UCLA abutment, metal UCLA abutment might be able to withstand functional load.

Keywords: Metal UCLA abutment, Settling effect, Dynamic loading, Implant-abutment

Figures and Tables

Fig. 1

Abutment specimens of this study.

Fig. 2

Digital torque gauge used in this study.

Fig. 3

Measurement of implant-abutment length.

Fig. 4

Graph for average deviation of axial displacement of each group before and after loading.

Fig. 5

Graph for average removal torque values of each group before and after loading.

Table 1

Material characteristics used in this study

Table 2

Results of Wilcoxon signed rank test of implant-abutment length before and after loading (unit: mm)

Table 3

Results of Wilcoxon signed rank test of removal torque values before and after loading (unit: Ncm)

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