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Bond strengths of five tapered root posts regarding the post surface
I Nergiz1, P Schmage, U Platzer
1Department of Operative Dentistry and Periodontology, Dental School, University of Hamburg, Germany.
Journal of Oral Rehabilitation
|April 23, 2002
Summary
Tapered passive root posts offer even force distribution but have lower retention. The Erlangen and MP Pirec systems showed superior bond strength compared to other tapered posts in tensile tests.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Tapered passive root posts provide homogenous force transmission, minimizing stress on the root.
- However, their retentive strengths are generally lower than other post systems.
Purpose of the Study:
- To evaluate and compare the retentive strengths of five different tapered post systems.
- To determine the influence of various factors on the bond strength of tapered posts.
Main Methods:
- An in vitro study involving tensile tests on 50 intact anterior teeth.
- Posts were cemented using zinc phosphate cement (Tenet) following manufacturer instructions.
- Contact surface area was considered for comparable results across different post configurations.
Main Results:
- Erlangen (10.8 N mm⁻²) and MP Pirec (10 N mm⁻²) post systems exhibited the highest bond strengths.
- These were significantly higher than Velva-Post (3.2 N mm⁻²), Cylindro-Conical (3.5 N mm⁻²), and Dr Mooser (1.7 N mm⁻²) systems.
- Bond strength was influenced by contact surface area, taper angle, post shape, cement joint width, surface roughness, and canal wall form.
Conclusions:
- The retentive strength of tapered posts varies significantly between different systems.
- Factors beyond contact surface area, including geometric and material properties, critically affect bond strength.
- Clinical selection of tapered posts requires consideration of these multiple influencing factors for optimal retention.