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Basic evaluation of cast joining for electroformed coping using multi-purpose alloys.
Yoko Yamaguchi1, Hidekazu Takahashi, Makoto Shiota
1Oral Implantology and Regenerative Dental Medicine, Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo 113-8549, Japan. yoko.impl@tmd.ac.jp
Dental Materials Journal
|November 12, 2005
Summary
Cast joining offers superior bonding strength for electroformed copings compared to soldering. This technique, evaluated at various temperatures, showed improved interface characteristics and significant bond strength, suggesting its potential clinical application.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials
Background:
- Electroformed copings are crucial in prosthodontics.
- Evaluating alternative joining techniques is essential for improving restoration longevity.
- Cast joining presents a novel method for attaching components to electroformed copings.
Purpose of the Study:
- To assess the bonding interface and strength of electroformed copings using cast joining with a multi-purpose alloy.
- To compare cast joining with traditional soldering methods.
- To determine the optimal casting temperature for cast joining.
Main Methods:
- Electroformed copings were joined with a multi-purpose alloy cast at 700, 750, or 800°C.
- A high noble alloy tab was soldered onto an electroformed coping as a control.
- Specimen interfaces were analyzed using scanning electron microscopy and electron probe microanalysis.
- Shear bonding strength was measured for cast joining (at 750°C) and soldered specimens.
Main Results:
- The cast joining interface showed elemental diffusion between the alloy and coping.
- Edge morphology of the cast joining alloy improved with increasing temperature.
- Cast joining specimens exhibited significantly higher shear bonding strength than soldered specimens.
- Optimal bonding was observed at a casting temperature of 750°C.
Conclusions:
- Cast joining demonstrates superior bonding strength and interface integrity compared to soldering for electroformed copings.
- The observed elemental diffusion contributes to enhanced bond strength.
- Cast joining is a promising technique for fabricating robust electroformed dental restorations.