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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Mechanical and ultrastructural evaluation of quartz post-endodontic reconstructions
M Majori1, R Bedini, C Altamura
1Department of Technology and Health, Italian National Institute of Health, Roma - Italy.
Journal of Applied Biomaterials & Biomechanics : JABB
|August 31, 2010
Summary
Thermal stress negatively impacts quartz fiber post retention in dental reconstructions, while humidity does not. This study highlights the importance of thermal stability for long-term post-endodontic restoration success.
Area of Science:
- Biomaterials Science
- Dental Materials
- Restorative Dentistry
Background:
- Aesthetics are crucial in dentistry, but mechanical integrity is paramount for post-endodontic restorations.
- Quartz fiber posts offer aesthetic advantages, yet their mechanical performance, particularly retention under oral conditions, requires further investigation.
- Understanding the impact of environmental factors on the bond stability of quartz fiber posts is essential for clinical success.
Purpose of the Study:
- To evaluate the retentive property of post-endodontic reconstructions using quartz fiber posts.
- To assess the influence of simulated oral thermal stresses and humidity on the bond stability between quartz fiber posts and dental structures.
- To analyze the microstructure of quartz fiber posts and the cement interface using scanning electron microscopy (SEM).
Main Methods:
- Thirty endodontically treated human teeth were restored with quartz fiber posts and divided into three groups.
- Group 1: Control (no treatment). Group 2: Subjected to 10 thermo-cycles (4°C to 58°C). Group 3: Stored in saline at 37°C for 48 hours.
- Tensile shear stress tests were performed, followed by SEM analysis of the posts and tooth sections.
Main Results:
- Mechanical testing revealed that thermal cyclic variations significantly affected the bond stability of quartz fiber post reconstructions.
- Increased humidity (saline storage) did not appear to compromise the bond strength of these restorations.
- SEM analysis showed a homogeneous structure of the quartz fiber posts and variable cement layer thickness within the root canals.
Conclusions:
- Thermal cycling can negatively influence the bond stability between dental structures and quartz fiber posts in post-endodontic reconstructions.
- Bond strength of quartz fiber post systems appears resilient to short-term humidity increases.
- The findings underscore the importance of considering thermal environmental factors in the clinical application of quartz fiber posts for enhanced longevity.
