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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

Publication:
May/June 2011
Volume 24 , Issue 3

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Effect of an Occlusal Screw-Access Hole on the Fracture Resistance of Permanently Cemented Implant Crowns: A Laboratory Study

Rola M. Shadid, BDS, MSc/Layla Abu-Naba’a, BDS, PhD, MFDRCS/Wael M. Al-Omari, BDS, MDentSci, PhD/Khaled R. Asfar, BSc, MSc, PhD/Bilal M. El Masoud, BDS, GradDipClinDent, DClinDent, FRACDS, FRACDS

Pages: 267–269
PMID: 21519576

This study aimed to evaluate the fracture resistance of cement-retained metal-ceramic implant-supported posterior crowns. Three groups of 10 restorations each were tested: group A (cement-retained using zinc phosphate), group B (cement-retained using zinc oxide–eugenol), and group C (cement-retained using zinc phosphate but with an occlusal screw-access hole). All specimens were thermocycled and vertically loaded in a universal testing machine. Mean values of fracture loads were calculated and analyzed statistically. The cement-retained restorations without an occlusal screw-access hole showed significantly higher mean fracture loads than those having one. The type of cement did not affect the porcelain fracture resistance significantly. Int J Prosthodont 2011;24:267–269.

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