Capacity to Maintain Placement Torque at Removal, Single Load-to-Failure, and Stress Concentration of Straight and Angled Abutments

The International Journal of Periodontics & Restorative Dentistry
Michelle Paulino SousaPaulo César da Cruz

Abstract

Because the main complication of implant-supported prostheses is torque loosening and/or fixation screw fracture, the goal of this study was to evaluate the torque before and after fatigue (screw placement and removal, respectively), single load-to-failure (compression test), and stress concentration of straight and angled abutments. Eighty implants were included in polyurethane cylinders. Half of the implants received straight abutments (group S, n = 40) and the other half received angled abutments (group A, n = 40). The abutments for cemented prostheses were installed with a torque of 20 Ncm. Eighty titanium structures were machined and cemented on the abutments with zinc-phosphate cement. After storage for 24 hours, half of the specimens had their torque loosening evaluated and were then immediately submitted to a compressive test in a universal testing machine (1 mm/minute, 1,000 kgf), while the other half were subjected to cyclic fatigue (200 N at 2 Hz for 2 × 106 cycles at 37°C) as an aging protocol (n = 20 from each group). The aged samples then had their torque loosening measured and were also submitted to the compression test. Representative samples were evaluated by scanning electron microscopy. Two bidimensional mode...Continue Reading

Citations

Jan 9, 2020·Computer Methods in Biomechanics and Biomedical Engineering·João Paulo Mendes TribstMarco Antonio Bottino
Jul 30, 2020·Journal of Clinical Medicine·Jorge VélezMaría J Suárez
Dec 24, 2021·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Dennis P TarnowStephen J Chu
Feb 4, 2022·European Journal of Dentistry·Isabela Vitelli TanakaMarco Antonio Bottino

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