Medical Applications of SLM

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CAD and Direct Manufacture of Removable Partial
DenturesDr. Richard Bibb
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Acknowledgements
Dr. Dominic EggbeerHead of Medical Applications
Group PDRUWIC Dr. Bob WilliamsCentre for
Dental TechnologyUWIC
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Introduction
Why? To investigate moving to an entirely digital
design and build procedure in dental
technology How? Using 3D Scanning, advanced CAD
and SLM Obstacles overcome Case studies time
consuming, finding our own way! Successes Many
cases done, test fitted to patients and published
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Scanning
Using optical scanning including structured white
light and laser scanning
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Scanning
Using optical scanning including structured white
light and laser scanning
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Scanning
Using optical scanning including structured white
light and laser scanning
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FreeForm CAD
FreeForm enables the design of complex forms and
shapes and utilises a haptic feedback device that
enables true 3D work in all axes
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FreeForm CAD
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FreeForm CAD
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FreeForm CAD
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Surveying
Using FreeForm CAD parting line function to
perform virtual surveying Just like physical
surveying
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Design
PDR pioneered full computer-aided design of RPD
frameworks
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Design
PDR pioneered full computer-aided design of RPD
frameworks
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Design
All design done according to best practice
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Design
All design done according to best practice Design
incorporates all features Rests, clasps, relief,
acrylic lines, connectors, etc.
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Design
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Design
Final design of RPD framework with all relevant
features added ready for direct manufacture
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Direct Manufacture
The framework needs supports during the build
process The framework is oriented so supports do
not interfere with the fitting surface
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Direct Manufacture
Selective Laser Melting (SLM)
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Direct Manufacture
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Direct Manufacture
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Direct Manufacture
RPD framework directly manufactured in
Cobalt-Chrome alloy Supports cutaway with
cutting disk Framework treated exactly the same
as a casting from this point onwards
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Direct Manufacture
RPD framework directly manufactured in
Cobalt-Chrome alloy Supports cutaway with
cutting disk Framework treated exactly the same
as a casting from this point onwards
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Direct Manufacture
The final RPD framework after finishing in the
dental laboratory using standard techniques
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Test Fitting
The final RPD framework after finishing test
fitted to the original patient cast
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Test Fitting
The final RPD framework after finishing test
fitted to the original patient cast
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Test Fitting
The final RPD framework after finishing test
fitted to the original patient cast
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Test Fitting
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Conclusions
The collaborative research has demonstrated that
the digital design and direct manufacture of RPD
frameworks is entirely feasible Scanning,
surveying, design and manufacture have been
demonstrated to be feasible, practical and
efficient The findings have been subject to peer
review and widely published Dental laboratories
are now seriously investigating this route and
commercial implementation is imminent
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Conclusions
SensAble now offer a dedicated version of their
software for dental applications
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References
Williams RJ, Bibb R, Eggbeer D, CAD/CAM
Fabricated Removable Partial-Denture Alloy
Frameworks, Practical Procedures Aesthetic
Dentistry 2008 20(6) 349-51 Williams RJ,
Eggbeer D, Bibb R, CAD/CAM Rapid Manufacturing
Techniques in the Fabrication of Removable
Partial Denture Frameworks, Quintessence Journal
of Dental Technology 2008 6(1) 42-50 Bibb R,
Eggbeer D, Williams RJ, Woodward A, Trial
fitting of a removable partial denture framework
made using computer-aided design and rapid
prototyping techniques, Proceedings of the
Institute of Mechanical Engineers Part H Journal
of Engineering in Medicine 2006 220(7)
793-7 Williams RJ, Bibb R, Eggbeer D, Woodward A,
A Patient-fitted removable partial denture
framework fabricated from a CAD/CAM-produced
sacrificial pattern, Quintessence Journal of
Dental Technology 2006 4(3) 200-4 Williams
RJ, Bibb R, Eggbeer D, Collis J, Use of CAD/CAM
technology to fabricate a removable partial
denture framework, Journal of Prosthetic
Dentistry 2006 96(2) 96-9 Bibb R, Eggbeer D,
Williams R, Rapid manufacture of removable
partial denture frameworks, Rapid Prototyping
Journal 2006 12(2) 95-9 Eggbeer D, Bibb R,
Williams R, The Computer Aided Design and Rapid
prototyping of Removable Partial Denture
Frameworks Proceedings of the Institute of
Mechanical Engineers Part H Journal of
Engineering in Medicine 2005 219(3)
195-202 Eggbeer D, Williams RJ, Bibb R, A
Digital Method of Design and Manufacture of
Sacrificial Patterns for Removable Partial
Denture Metal Frameworks Quintessence Journal of
Dental Technology 2004 2 490-9 Williams RJ,
Bibb R, Eggbeer D, CAD/CAM in the Fabrication of
Removable Partial Denture Frameworks A Virtual
Method of Surveying 3D Scanned Dental Casts
Quintessence Journal of Dental Technology 2004
2 268-76 Williams RJ, Bibb R, Rafik T, A
technique for fabricating patterns for removable
partial denture frameworks using digitized casts
and electronic surveying Journal of Prosthetic
Dentistry 2004 91 85-8