Fracture Resistance of Aged Full-Coverage All-Ceramic Zirconia and Metal-Ceramic Restorations of Implant-Supported Fixed Partial Dentures

Fariborz  Vafaee; Amirarsalan  Hooshyarfard; Armaghan Shahbazi; Farnoush  Fotovat; Masoumeh  Khoshhal; Shamsodin  Heydari

doi:10.3889/oamjms.2020.4919

Authors

Fariborz Vafaee Department of Prosthodontics, Dental Implants Research Center, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
Amirarsalan Hooshyarfard Department of Periodontics, Dental Research Center, Dental Implants Research Center, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
Armaghan Shahbazi Department of Prosthodontics, Dental Implants Research Center, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
Farnoush Fotovat Department of Prosthodontics, Dental Implants Research Center, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
Masoumeh Khoshhal Private Periodontist, Hamadan, Iran
Shamsodin Heydari Private Dentist, Hamadan, Iran

DOI:

https://doi.org/10.3889/oamjms.2020.4919

Keywords:

Fatigue, Zirconium oxide, Fracture strength, Metal-ceramic restorations

Abstract

BACKGROUND: Metal-ceramics restorations were considered a preferable option for fabrication fixed partial dentures (FPDs) that have an acceptable durability, but they are not able to provide the same beauty as the entire ceramic material. Full-contour zirconia, such as Zolid, does not have problems with chipping of layered zirconia, along with translucency and staining capabilities.

AIM: This study aimed to assess the fatigue fracture strength of three-unit implant-supported full-contour zirconia and metal-ceramics posterior FPDs.

MATERIALS AND METHODS: In this in vitro study, 24 posterior three-unit implant-supported FPDs were fabricated of full-contour zirconia and metal-ceramics and were cemented on implant abutments. To simulate the oral environment, FPDs were subjected to 10,000 thermal cycles between 5 and 55°C for 30 s and were then transferred to a chewing simulator (100,000 cycles, 50 N, 0.5 Hz). Afterward, fatigue fracture strength was measured using a universal testing machine. Data were analyzed using an independent sample t-test.

RESULTS: The obtained results showed that the mean and standard deviation of fatigue fracture strength was higher for the metal-ceramics group (2567.8 ± 689.7 N) compared to those for the full-coverage zirconia group (2108.6 ± 455.2 N). However, the difference was not statistically significant (p ˃ 0.05).

CONCLUSIONS: Fracture resistance due to fatigue in the metal-ceramics group was not significantly different from full-coverage zirconia group. Full-coverage zirconia seems promising as a metal-ceramics material for the fabrication of posterior three-unit FPDs.

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