| ORIGINAL RESEARCH |
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| Year : 2017 | Volume
: 9
| Issue : 5 | Page : 202-206 |
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Polyether ether ketone in protocol bars: Mechanical behavior of three designs
Geraldo Alberto Pinheiro de Carvalho, Aline Batista Gonçalves Franco, Simone Kreve, Elimário Venturin Ramos, Sergio Cândido Dias, Flávia Lucisano Botelho do Amaral
São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
Correspondence Address:
Geraldo Alberto Pinheiro de Carvalho
Rua Vereadora Lucia Carvalho 235, Parque São José, Varginha, Minhas Gerais
Brazil
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/jioh.jioh_163_17
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Aim: This study evaluated the compressive strength (CS) of protocol bars on polyether ether ketone (PEEK) implants compared to metallic bars (NiCr). Materials and Methods: Thirty PEEK bars and thirty metallic bars (control) were produced using three different cross-sectional designs (n = 10): rectangular cross-section solid bar (R), T-type (T), and inverted T-type (T inv). All bars were 30 mm long. The bars were screwed to Cone Morse implants of 3.75 mm × 11.0 mm and submitted to compression strength test in a universal testing machine (0.5 mm/min), with the load applied to the bar cantilever. After the test, we measured the counter torque on the screws. Results: Compression strength (N) and counter torque (N/cm) data were analyzed with two criteria: ANOVA and Tukey (α = 0.05). PEEK bars showed mean compression strength significantly lower than NiCr bars, for all designs (P < 0.001), with R bars showing the best results and T inv, the worst results. PEEK bars showed smaller counter torque values than NiCr bars for R or T designs (P = 0.002). Conclusion: For PEEK bars, T inv design resulted in the smaller compression strength. PEEK solid bars, with rectangular cross-section, showed larger resistance to compression in comparison to the other designs. However, PEEK bars showed lower compression strength than that verified for metallic bars.
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