Axial wall thickness of zirconia abutment in anterior region

Seung-Jin Moon; Yu-Ri Heo; Gyeong-Je Lee; Hee-Jung Kim

doi:10.4047/jkap.2015.53.4.345

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Moon, Heo, Lee, and Kim: Axial wall thickness of zirconia abutment in anterior region

Original Article

J Korean Acad Prosthodont 2015;53(4):345-351.

Published online: 9 February 2015

DOI: https://doi.org/10.4047/jkap.2015.53.4.345

Axial wall thickness of zirconia abutment in anterior region

Seung-Jin Moon¹, Yu-Ri Heo², Gyeong-Je Lee², Hee-Jung Kim^2,^∗

¹School of Dentistry, Chosun University, Gwangju, Republic of Korea

²Department of Prosthodontics, School of Dentistry, Chosun University, Gwangju, Republic of Korea

^∗Corresponding Author: Hee-Jung Kim Department of Prosthodontics, School of Dentistry, Chosun University, 303, Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea +82 62 220 3820: e-mail, japeditor@kap.or.kr

^※ This study was supported by research fund from Chosun University, 2012.

Received 2 September 201512 October 2015 Accepted 13 October 2015

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 purpose of this study was to evaluate the proper axial thickness of zirconia abutment applied to implant in the anterior region.

Materials and methods

Zirconia abutments were prepared at different axial wall thickness by processing pre-sintered zirconia blocks via CAD/CAM to obtain equal specimens. The abutments were each produced with a thickness of 0.5 mm (Group 1), 0.8 mm (Group 2), 1.2 mm (Group 3), or 1.5 mm (Group 4). The implant used in this study was a external connection type one (US, Osstem, Pussan, Korea) product and the zirconia abutment was prepared via replication of a cemented abutment. The crowns were prepared via CAM/CAM with a thickness of 1.5 mm and were cemented to the abutments using RelyX ^TM UniCem cement. A universal testing machine was used to apply load at 30 degrees and measure fracture strength of the zirconia abutment.

Results

Fracture strength of the abutments for Group 1, Group 2, Group 3, and Group 4 were 236.00 ± 67.55 N, 599.00 ± 15.80 N, 588.20± 33.18 N, and 97.83 ± 98.13 N, respectively. Group 1 showed a significantly lower value, as compared to the other groups (independent Mann-Whitney U-test. P<.05). No significant differences were detected among Group 2, Group 3, and Group 4 (independent Mann-Whitney U-test. P>.05).

Conclusion

Zirconia abutment requires optimal thickness for fracture resistance. Within the limitation of this study, > 0.8 mm thickness is recommended for zirconia abutment in anterior implants.

Keywords: Zirconia abutment, Fracture strength, Axial wall thickness

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Fig. 1.

Abutment design used in the study (a: thickness of axial wall of abutment).

Fig. 2.

Zirconia abutment for this experiment. (A) frontal view, (B) incisal view.

Fig. 3.

Implant, zirconia abutment and zirconia crown used in the study.

Fig. 4.

Measurement of fracture strength. The load was applied 3mm below the incisal edge at an angle of 30®.

Fig. 5.

Fracture aspect of zirconia abutment according to static loading. (A) Group 1: axial wall thickness of 0.5 mm; (B) Group 2: axial wall thickness of 0.8 mm; (C) Group 3: axial wall thickness of 1.2 mm: (D) Group 4: axial wall thickness of 1.5 mm.

Table 1.

Mean fracture strength of zirconia abutment

Group	Fracture strength (N)
1	236.00 ± 67.55	a
2	599.00 ± 15.80	b
3	588.20 ± 33.18	b
4	597.83 ± 98.13	b

^∗ A different alphabet denotes statistically significant difference.

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