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Effectiveness of cast-joined Ni-Cr-Be structures
P H DeHoff1, K J Anusavice, J Evans
1University of North Carolina, Charlotte 28223.
The International Journal of Prosthodontics
|November 1, 1990
Summary
Cast-joining dental alloys like Rexillium III (Ni-Cr-Be) shows limited load transfer effectiveness. This technique may increase failure risk under high flexural stress in clinical applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Prosthodontics
Background:
- Cast-joining is a technique used in fabricating dental prostheses.
- Evaluating the mechanical integrity of cast-joined structures is crucial for clinical success.
Purpose of the Study:
- To assess the load transfer effectiveness of cast-joined dental alloy structures under flexural loading.
- To compare the performance of different interlocking designs for cast-joined bars.
Main Methods:
- Rexillium III (Ni-Cr-Be) alloy bars with five interlocking designs were fabricated.
- Four-point bending tests were conducted using an Instron testing machine.
- Strain gauges measured load transfer across interfaces up to a 0.1% strain level.
Main Results:
- One interlocking design (Weiss and Munyon) showed higher failure load than others but was lower than solid bars.
- Load-transfer effectiveness for the best design was less than 22% at the critical strain.
- Failure was defined at 0.1% strain, equivalent to feldspathic porcelain's tensile failure strain.
Conclusions:
- The cast-joining technique demonstrates suboptimal load transfer capabilities.
- This technique may compromise the structural integrity of dental restorations under significant flexural stress.
- Further research is needed to optimize cast-joining methods for enhanced clinical performance.