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Mechanical performance of implant-supported posterior crowns
Paul de Kok1, Cornelis J Kleverlaan2, Niek de Jager3
1Doctoral student and Clinical Instructor, Academic Centre for Dentistry Amsterdam (ACTA) University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands.
The Journal of Prosthetic Dentistry
|March 31, 2015
Summary
Monolithic implant-supported crowns demonstrate superior fracture resistance compared to veneered crowns. This study suggests monolithic ceramic restorations may offer better performance than composite resin options in dental applications.
Area of Science:
- Dental materials science
- Biomaterials engineering
- Prosthodontics
Background:
- Implant-supported restorations frequently experience fractures, particularly in the veneering layer.
- Monolithic ceramic and resin materials present potential solutions to improve restoration durability.
Purpose of the Study:
- To evaluate the fracture risk of various implant-supported restorations.
- To compare the performance of monolithic and veneered crown materials under load.
Main Methods:
- Ten different ceramic and composite resin materials were fabricated into crowns and cemented onto implant replicas.
- Compressive load testing determined the initial load to failure (ILF) for each crown.
- Material properties (flexural strength, compressive strength, elastic modulus) and finite element analysis were conducted.
Main Results:
- Anatomic contour zirconia crowns exhibited the highest ILF, followed by lithium disilicate and composite resins. Veneered zirconia showed the lowest ILF.
- Highest flexural strength, compressive strength, and elastic modulus were observed for zirconia and lithium disilicate.
- No direct correlation was found between material strength properties and ILF; surface roughness may influence failure points.
Conclusions:
- Monolithic implant-supported crowns exhibited significantly higher initial load to failure than conventional veneered ceramic crowns.
- Monolithic ceramic restorations may offer superior clinical performance compared to composite resin restorations.
