Effect of Repeated Heat Pressing on Fracture Resistance and Mode of Failure of Polyetheretherketone (PEEK) Three-Unit Fixed Dental Prosthesis (FDP). | ||||
| Egyptian Dental Journal | ||||
| Article 8, Volume 68, Issue 3 - Serial Number 4, July 2022, Page 2531-2542 PDF (1.38 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2022.130126.2049 | ||||
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| Authors | ||||
Ahmed Arafa   1; Marwa Emam 2
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| 1Lecturer, Department of Fixed Prosthodontics, Faculty of Dentistry, Beni-Suef University, Beni-Suef, Egypt. | ||||
| 2Lecturer, Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt. | ||||
| Abstract | ||||
| Purpose: to evaluate the effect of repeated heat pressing on fracture resistance and mode of failure analysis of new and reprocessed PEEK either partially or totally 3-unit FDPs. Methods: 15 PEEK FDPs were manufactured and divided into 3 groups (n=5). Group I was pressed using new PEEK, Group II; 50% new PEEK and 50% reprocessed PEEK, and Group III; 100% reprocessed PEEK. The FDPs were vertically loaded till failure in a universal testing machine. Failed specimens were examined for mode of failure and microstructural analysis with SEM and XRD. Results: There was a statistically significant difference between mean fracture resistance values of different PEEK conditions (P-value = 0.006, Effect size = 0.577). Pair-wise comparisons between conditions revealed no statistically significant difference between new (1719.6±315.7) and partially reprocessed PEEK (2010.4±444.4); both showed statistically significant higher mean fracture resistance than totally reprocessed PEEK (1097.2±319.5). Mode of failure analysis showed only bending in the new PEEK group bending (100%). While in the partially processed PEEK group 40% of the samples showed visible cracks at the connector area. Finally, in the totally processed PEEK group 80% showed complete fracture. Conclusion: Totally reprocessed PEEK 3-unit FDPs had the lowest fracture resistance compared to new and partially reprocessed PEEK although all exceeded maximum occlusal forces recorded in the molar area. Incorporating reprocessed PEEK material in 3-unit FDPs increased brittleness and decreased their ability to deform and absorb stresses created during force application. | ||||
| Keywords | ||||
| PEEK; reprocessing; fracture resistance; SEM; XRD | ||||
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