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Laser welding of removable partial denture frameworks.
James S Brudvik1, Seungbum Lee, Steve N Croshaw
1University of Washington, Seattle, Washington, USA. brudvik@u.washington.edu
The International Journal of Prosthodontics
|August 23, 2008
Summary
Laser welding cobalt-chromium (Co-Cr) frameworks corrects fit discrepancies. This study quantifies distortions during casting and laser welding, showing precise tooth-frame relations are achievable.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Cobalt-chromium (Co-Cr) alloys are widely used for removable partial denture frameworks.
- Casting processes can introduce dimensional inaccuracies, affecting framework fit.
- Laser welding offers potential for precise adjustments in dental prosthetics.
Purpose of the Study:
- To quantify distortions in Co-Cr frameworks during casting.
- To measure dimensional changes during laser welding for fit correction.
- To highlight challenges faced by dental technicians and clinicians.
Main Methods:
- Five identical Co-Cr castings were fabricated.
- Measurements were taken using a Nikon Measurescope before and after key procedures.
- Procedures included sprue removal, sectioning, master cast fitting, resin pickup, and laser welding.
Main Results:
- Cross-arch measurements showed a decrease after sprue removal.
- An increase in distortion was observed after fitting segments to the master cast.
- Laser welding resulted in a slight decrease in distortion.
Conclusions:
- Resin pickup and laser welding can effectively establish precise tooth-frame relations.
- Co-Cr framework fabrication and adjustment require careful attention to dimensional stability.
- The study provides quantitative data on distortions during Co-Cr framework fabrication and correction.
