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Title: Mechanical and spectroscopic analysis of retrieved/failed dental implants
Authors: Daood, U
Banday, N
Akram, Z
Tsoi, J.K
Neelakantan, P
Omar, H
Abduljabbar, T
Vohra, F
Al-Hamoudi, N
Fawzy, A.S 
Issue Date: 2017
Citation: Daood, U, Banday, N, Akram, Z, Tsoi, J.K, Neelakantan, P, Omar, H, Abduljabbar, T, Vohra, F, Al-Hamoudi, N, Fawzy, A.S (2017). Mechanical and spectroscopic analysis of retrieved/failed dental implants. Coatings 7 (11) : 201. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: The purpose of this study was to examine surface alterations and bone formation on the surface of failed dental implants (Straumann [ST] and TiUnite [TiUn]) removed due to any biological reason. In addition, failure analysis was performed to test mechanical properties. Dental implants (n = 38) from two manufacturers were collected and subjected to chemical cleaning. The presence of newly formed hydroxyapatite bone around failed implants was evaluated using micro-Raman spectroscopy. Scanning electron microscopy was used to identify surface defects. Mechanical testing was performed using a Minneapolis servo-hydraulic system (MTS) along with indentation using a universal testing machine and average values were recorded. A statistical analysis of mechanical properties was done using an unpaired t test, and correlation between observed defects was evaluated using Chi-square (p = 0.05). Apatite-formation was evident in both implants, but was found qualitatively more in the ST group. No significant difference was found in indentation between the two groups (p > 0.05). The percentage of "no defects" was significantly lower in the ST group (71%). Crack-like and full-crack defects were observed in 49% and 39% of TiUn. The ST group showed 11,061 cycles to failure as compared with 10,021 cycles in the TiUnite group. Implant failure mechanisms are complex with a combination of mechanical and biological reasons and these factors are variable with different implant systems. © 2017 by the authors.
Source Title: Coatings
ISSN: 20796412
DOI: 10.3390/coatings7110201
Rights: Attribution 4.0 International
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