J Korean Acad Prosthodont.  2011 Oct;49(4):354-361. 10.4047/jkap.2011.49.4.354.

Surveyed restoration and RPD framework design utilizing electronic surveying

• Hong YS
• Park EJ
• Kim SK
• Koak JY
• Heo SJ
• Park JM

• KMID: 2195531
• DOI: http://doi.org/10.4047/jkap.2011.49.4.354

Abstract

There are still many limitations on fabricating dentures using digital method while computerized production of fixed prostheses utilizing intraoral scanner and CAD/CAM technology has propagated rapidly. Recently the digital solution of fabricating removable partial denture by applying haptic input device, electronic surveying, and rapid prototyping was introduced. In this case presentation, five patients were treated with surveyed crown and removable partial dentures by this digital solution. Fit of dentures was excellent except for one case which showed morphological difference between the actual teeth and that of master cast by the erroneous impression process. There also was not any problem of stability and retention after adaptation in the clinical setting.

Keyword

Haptic input device; Electronic surveying; CAD; Rapid prototyping

MeSH Terms

Crowns
Denture, Partial, Removable
Dentures
Electronics
Electrons
Humans
Prostheses and Implants
Retention (Psychology)
Tooth

Figure

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  Fig. 1. Initial photograph of clinical case 1. A, B: initial occlusal view, C, D: the solid computer model of the patient's cast, E: initial panoramic view.

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  Fig. 2. Surveyed crown fabrication utilizing electronic surveying. (Case 1) A: clinical photo after hemi-section surgery of lower right first molar, B: after preparation for surveyed restoration, C: electronic view of abutment teeth after setting ‘path of insertion’, D: completed surveyed crown.

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  Fig. 3. Computer-aided designing procedures of case 1. A: haptic input device and FreeForm CAD software, B: electronic surveying, C: occlusal rest and minor connector designing, D: retentive tip goes below ‘height of contour’ (light blue color) and into the notch (rainbow color) made during electronic surveying, E, F: completed upper and lower framework design with sprue structure for metal casting.

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  Fig. 4. Framework fit check procedure at patient 1. A: Occlusal view of upper arch, B: framework fits well on lower teeth.

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  Fig. 5. Summarized photographs of case 2. A: the solid computer model of the patient's cast, B: electronic surveying and framework design on FreeForm software, C: completed framework on master cast, D: final prosthesis put on patient's upper arch.

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  Fig. 6. Summarized photographs of case 3. A: scanning procedure, B: completed framework design, C: framework fit check on master model, D: final prosthesis in the mouth.

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  Fig. 7. Summarized photographs of case 4. A: occlusal view after natural teeth alteration, B: completed framework design, C: tissue surface of framework and characteristic contour line on palate area, D: final prosthesis put on patient's upper arch.

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  Fig. 8. Summarized photographs of case 5. A, B: initial occlusal view, C, D: digital surveying and CAD design, E: tissue surface of upper framework (contour line), F: completed lower framework with individual tray for functional impression of distal extension base, G, H: final prostheses.

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