Experimental research on the relationship between fit accuracy and fracture resistance of zirconia abutments

Xinxin Sui; Huasha Wei; Dashan Wang; Yan Han; Jing Deng; Yongliang Wang; Junjun Wang; Jianjun Yang

doi:10.1016/j.jdent.2014.02.008

Experimental research on the relationship between fit accuracy and fracture resistance of zirconia abutments

J Dent. 2014 Oct;42(10):1353-9. doi: 10.1016/j.jdent.2014.02.008. Epub 2014 Feb 18.

Authors

Xinxin Sui¹, Huasha Wei², Dashan Wang¹, Yan Han³, Jing Deng¹, Yongliang Wang¹, Junjun Wang¹, Jianjun Yang⁴

Affiliations

¹ Oral and Maxillofacial Surgery, Affiliated Hospital, Qingdao University, Qingdao, China.
² Department of Stomatology, Qingdao Eighth People's Hospital, Qingdao, China.
³ Radiology Department, Affiliated Hospital, Qingdao University, Qingdao, China.
⁴ Oral and Maxillofacial Surgery, Affiliated Hospital, Qingdao University, Qingdao, China. Electronic address: yjjqd@126.com.

PMID: 24561040
DOI: 10.1016/j.jdent.2014.02.008

Abstract

Objectives: The purpose of the study was to investigate the correlation between fit accuracy and fracture resistance of zirconia abutments, as well as its feasibility for clinical applications.

Methods: Twenty self-made zirconia abutments were tested with 30 Osstem GSII implants. First, 10 Osstem GSII implants were cut into two parts along the long axis and assembled with the zirconia abutments. The microgaps between the implants and the zirconia abutments were measured under a scanning electron microscope. Second, the zirconia abutments were assembled with 20 un-cut implants and photographed before and after being fixed with a central screw of 30-Ncm torque. The dental films were measured by Digora for Windows 2.6 software. Then the fracture resistance of zirconia abutments was measured using the universal testing machine at 90°. All results were analyzed using SPSS13.0 software.

Results: The average internal-hexagon microgaps between the implants and zirconia abutments were 19.38±1.34μm. The average Morse taper microgap in the implant-abutment interface was 17.55±1.68μm. The dental film showed that the Morse taper gap in the implant-abutment interface disappeared after being fixed with a central screw of 30-Ncm torque, and the average moving distance of the zirconia abutments to the implants was 0.19±0.02mm. The average fracture resistance of zirconia abutments was 282.93±17.28N. The internal-hexagon microgap between the implants and zirconia abutments was negatively related to the fracture resistance of the abutments (r1=-0.97, p<0.01). The Morse taper microgap in the implant-abutment interface was negatively related to the fracture resistance of the abutments (r2=-0.84, p<0.01).

Conclusions: The microgap between implant and abutment was negatively related to the fracture resistance of the abutment, while the internal-hexagon microgap has better correlation than the Morse taper microgap. The closure of microgap is helpful to improve the fracture resistance of zirconia abutments. The fracture resistance of zirconia abutments can satisfy the clinical application.

Keywords: Fit accuracy; Fracture resistance; Internal hexagon; Morse taper; Zirconia abutment.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Dental Abutments*
Dental Implant-Abutment Design*
Dental Marginal Adaptation*
Dental Materials / chemistry*
Dental Stress Analysis / instrumentation
Feasibility Studies
Humans
Image Processing, Computer-Assisted / methods
Materials Testing
Microscopy, Electron, Scanning
Photography / methods
Radiography, Dental, Digital / methods
Stress, Mechanical
Surface Properties
Titanium / chemistry
Torque
Zirconium / chemistry*

Substances

Dental Materials
Zirconium
Titanium
zirconium oxide