Fracture Strength of Implant-Supported Ceramic Crowns with Customized Zirconia Abutments: Screw Retained vs. Cement Retained

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
Lorenna Bastos Lima Verde NogueiraGregorio Antonio Soares Martins

Abstract

To compare the fracture resistance before and after cyclic fatigue assays of ceramic crowns with customized zirconia abutments when screw retained and cemented onto implants. The sample of this study consisted of 40 ceramic crowns with zirconia infrastructure fixed onto external hexagonal implants. The crowns were distributed into two groups (n = 20): Screw-retained and cemented crowns. Half the crowns of each group (n = 10) underwent compression until fracture and the other half (n = 10) underwent cyclic fatigue and subsequent compression until fracture. The cyclic fatigue test was carried out using an electromechanical fatigue device (loads from 0 to 100 N, 2 Hz frequency, in distilled water, at 37 °C for a period of 1 million cycles). The compression test was carried out using a universal testing machine with a 0.5 mm/min speed and 5 KN load cell. After fracture, the crowns were classified according to the type of fracture. Student's t test (p < 0.05) was used for statistical analysis. The cyclic fatigue altered neither the mean fracture resistance of the screw-retained crowns (before = 1068.31 N, after = 891.49 N; p > 0.05) nor that of the cemented crowns (before = 2117.78 N; after = 2094.81 N; p > 0.05); however, the mean ...Continue Reading

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Citations

Mar 8, 2016·The Journal of Prosthetic Dentistry·Ahmed Naguib M HussienMathew T Kattadiyil
Nov 22, 2015·The Journal of Prosthetic Dentistry·Cleidiel Aparecido Araujo LemosEduardo Piza Pellizzer
Jan 24, 2017·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·George Priest
Jun 30, 2016·Implant Dentistry·Aritza Brizuela-VelascoGorka Santamaría-Arrieta

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