Behr, Michael and Fuerst, Jan and Rosentritt, Martin (2018) The error of tensile strength tests and an approach for improvement. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, 87. pp. 138-142. ISSN 1751-6161, 1878-0180
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Objectives: The deviation and spread of values measured by tensile strength tests should be significantly reduced by optimized axially pull-off-device. Material and methods: Factors like geometry, roughness, surface texture and fit of the specimens, the luting procedure (mixing ratio, compacting pressure) were standardized and the precision of the axially load transmission during the tensile force application optimized. Copings of CoCr-alloy were luted using a provisional zinc-oxide eugenol and a glass-ionomer cement (n = 20 per group each) on 4 degrees, respectively 8 degrees titanium implant abutment analogs. 24 h after luting the copings were pulled off with the improved (IPD) and the previous non improved device (NIPD). Means, std. dev. and t-tests were calculated. Results: The stress- strain curves produced by the IPD showed a clear and linear relationship between stress and strain. The curves of the NIPD were ragged and chaotic. For both luring agents the means of the retentive force were considerable higher (p > 0.000) with IPD. However, the standard deviation was unimproved for the zinc oxide eugenol cement: IPD: 27%; NIPD: 27%, but significantly improved with glass ionomer: IPD: 16%, NIPD: 28%. Conclusion: The results from luting agents, which react like a solid body, may benefit from the optimized pull-off-device. Despite the fact that many factors in this investigation have been controlled, unknown flow characteristics of non-Newtonian-fluids like luting agents may have a considerable influence on the standard deviation of pull-off tests.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LUTING AGENTS; ABUTMENTS; RETENTION; COPINGS; CEMENTS; METAL; Tensile strength test; Luting agent; Pull-off test; Precision; Stress-strain curves; Standard deviation |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Dec 2019 10:14 |
| Last Modified: | 04 Dec 2019 10:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13654 |
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