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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads

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Multiple-unit implant frames: one-piece casting vs. laser welding and brazing.

Elza Maria Valadares da Costa¹, Maximiliano Piero Neisser, Marco Antônio Bottino

¹Department of Prosthodontics and Dental Materials, Dental School, Universidade Estadual Paulista, São José dos Campos, São Paulo, Brazil.

Journal of Applied Oral Science : Revista FOB

|November 5, 2010

Summary

Laser welding significantly reduced linear distortion in implant-supported prostheses compared to brazing and one-piece casting. This finding is crucial for improving the fit of dental prostheses, enhancing patient outcomes.

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Published on: July 1, 2013

Area of Science:

Biomaterials Science
Dental Implantology
Prosthodontics

Background:

Accurate fit of implant-supported prostheses is critical for long-term success.
Linear distortion during fabrication can compromise prosthesis fit and function.
Various fabrication techniques, including one-piece casting, sectioning with brazing, and sectioning with laser welding, are used.

Purpose of the Study:

To evaluate and compare the linear distortion of dental prostheses fabricated using different methods.
To determine the most accurate fabrication technique for implant-supported prostheses in a mandibular model.

Main Methods:

An edentulous mandibular model with five parallel abutments was used.
Gold cylinders were attached to abutments, and metal frames were fabricated using one-piece casting (GM), section and brazing (GB), and section and laser welding (GL).
Linear distortion was measured microscopically at multiple interfaces and analyzed using ANOVA and Tukey's test.

Main Results:

The laser welding group (GL) exhibited the least linear distortion (mean value 13.58).
The brazing group (GB) showed moderate distortion (mean value 24.33).
The one-piece casting group (GM) demonstrated the greatest linear distortion (mean value 40.00).

Conclusions:

Laser welding is a superior technique for minimizing linear distortion in implant-supported prostheses.
Fabrication method significantly impacts the dimensional accuracy of dental prostheses.
Reducing distortion is essential for achieving passive fit and optimal clinical outcomes in implant dentistry.