1. Effect of an occlusal screw-access hole on the fracture resistance of permanently cemented implant crowns: a laboratory study.
- Author
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Shadid RM, Abu-Naba'a L, Al-Omari WM, Asfar KR, and El Masoud BM
- Subjects
- Analysis of Variance, Dental Bonding methods, Dental Implants, Single-Tooth, Dental Prosthesis Design, Dental Prosthesis, Implant-Supported, Dental Stress Analysis, Humans, Materials Testing, Statistics, Nonparametric, Crowns, Dental Abutments, Dental Cements chemistry, Dental Prosthesis Retention methods, Dental Restoration Failure, Metal Ceramic Alloys
- Abstract
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.
- Published
- 2011