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Mechanical performance of dental amalgam--composite interfaces.
R Bedini1, P Chistolini, G De Angelis
1Biomedical Engineering Laboratory, Istituto Superiore di Sanità, Rome, Italy.
Clinical Materials
|December 9, 1993
Summary
This study evaluated the mechanical strength of amalgam bonded to composite materials for tooth restoration. Tensile stress tests showed higher mean values than shear stress tests, indicating potential for aesthetic dental solutions.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Composite veneering of amalgam offers an aesthetic solution for extensive direct tooth restorations.
- This technique is successfully applied in specific clinical scenarios, highlighting the need to understand its mechanical properties.
Purpose of the Study:
- To evaluate the mechanical performance of an amalgam-composite interface.
- To compare the tensile and shear stress resistance of different composite materials bonded to amalgam.
Main Methods:
- An in-vitro study utilizing a PC-controlled electronic dynamometer.
- Tensile and shear stress at break tests were performed on dumb-bell and sandwich specimens.
- The mechanical performance of one amalgam bonded to four different composites was assessed.
Main Results:
- The amalgam-composite interfaces were subjected to mechanical stress testing.
- Mean values for tensile stress at break were higher than those for shear stress at break.
- Variations in performance were observed among the four different composite materials tested.
Conclusions:
- The study provides initial in-vitro data on the mechanical reliability of amalgam-composite interfaces.
- Higher tensile strength compared to shear strength suggests specific failure modes to consider.
- Further clinical studies are essential to determine the long-term reliability and efficacy of this restorative approach.