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Retention between a serrated steel dowel and different core materials
P L Millstein1, J Ho, D Nathanson
1Department of Biomaterials, Boston University, Goldman School of Graduate Dentistry, Mass.
The Journal of Prosthetic Dentistry
|April 1, 1991
Summary
This study evaluated dowel post retention with different core materials. Composite resin and amalgam showed superior strength and fracture resistance compared to glass ionomer cements for dental post and core applications.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Dowel posts are crucial for restoring endodontically treated teeth.
- Core materials provide support for the final restoration.
- Understanding material properties is essential for clinical success.
Purpose of the Study:
- To compare the tensile bond strength and fracture resistance of dowel posts retained in different core materials.
- To evaluate the suitability of glass ionomer cements, composite resin, and amalgam as core materials for dowel post retention.
Main Methods:
- Post and core assemblies were fabricated using serrated dowel posts with glass ionomer cement, composite resin, and amalgam.
- Tensile forces were applied to the assemblies using an Instron Universal testing machine at a cross-head speed of 0.02 cm/min.
- Separation forces were recorded to determine retention strength.
Main Results:
- Glass ionomer cements exhibited low tensile strength and poor fracture resistance.
- Metalized ionomers demonstrated brittleness and inadequate fracture resistance.
- Composite resin and amalgam core materials displayed high tensile strength and relative fracture resistance.
Conclusions:
- Composite resin and amalgam are superior core materials for dowel post retention due to their mechanical properties.
- Glass ionomer cements are not recommended for post and core applications requiring high tensile strength and fracture resistance.