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Mechanical and Spectroscopic Analysis of Retrieved/Failed Dental Implants

2017; Multidisciplinary Digital Publishing Institute; Volume: 7; Issue: 11 Linguagem: Inglês

10.3390/coatings7110201

2079-6412

Umer Daood, Ninette Banday, Zohaib Akram, KH Tsoi, Prasanaa Neelakantan, Hanan Omar, Tariq Abduljabbar, Fahim Vohra, Nawwaf Al‐Hamoudi, Amr Fawzy,

Bone Tissue Engineering Materials

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.