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Bend testing of wrought wire removable partial denture alloys
M D Waldmeier1, J E Grasso, G J Norberg
1School of Dental Medicine, University of Connecticut Health Center, Farmington, USA.
The Journal of Prosthetic Dentistry
|November 1, 1996
Summary
The stiffness and flexibility of wrought wire clasps depend on both the alloy type and gauge. Ticonium was the stiffest, while Denture Clasp and Jelenko Standard were most flexible, highlighting material choice importance.
Area of Science:
- Biomaterials Science
- Dental Materials Science
- Mechanical Engineering
Background:
- Wrought wire clasps are crucial components in removable partial dentures, providing retention and stability.
- The mechanical properties, particularly flexibility, of these clasps are influenced by the alloy composition and dimensions.
- Understanding these properties is essential for optimal denture design and patient comfort.
Purpose of the Study:
- To compare the bending behavior of five commonly used wrought wire alloys in removable partial dentures.
- To evaluate the influence of different gauge diameters on the mechanical properties of these alloys.
- To provide data aiding clinicians in selecting appropriate materials for wire clasps.
Main Methods:
- Five wrought wire alloys (Ticonium, platinum-gold-palladium, Wironium, Jelenko Standard, Denture Clasp) in various gauge diameters were tested.
- Three-point bending tests were conducted using a servohydraulic testing system at a controlled rate (1.00 mm/sec).
- Maximum stress and elastic modulus in bending were determined for each alloy and gauge combination.
Main Results:
- Significant differences in maximum stress and elastic modulus were found between different alloys of the same gauge and between different gauges of the same alloy.
- Ticonium exhibited the highest elastic modulus (stiffness) across all tested gauges.
- Denture Clasp and Jelenko Standard alloys demonstrated the lowest elastic modulus (greatest flexibility).
Conclusions:
- Both the choice of wrought wire alloy and the gauge diameter significantly impact the bending properties of clasps for removable partial dentures.
- Material selection based on desired flexibility (elastic modulus) is as critical as gauge size.
- These findings support informed clinical decisions for fabricating durable and functional removable partial dentures.