RPD framework fabrication using computer-aided design (CAD) and rapid prototyping

Seon-Ah Park; Jai-Young Koak; Seong-Joo Heo; Seong-Kyun Kim; Ji-Man Park

doi:10.4047/jkap.2017.55.1.94

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J Korean Acad Prosthodont. 2017 Jan;55(1):94-99. Korean. Published online Jan 25, 2017. https://doi.org/10.4047/jkap.2017.55.1.94
© 2017 The Korean Academy of Prosthodontics


RPD framework fabrication using computer-aided design (CAD) and rapid prototyping
Seon-Ah Park, Jai-Young Koak, Seong-Joo Heo, Seong-Kyun Kim and Ji-Man Park
Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
Corresponding Author: Jai-Young Koak. Department of Prosthodontics, School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul 03080, Republic of Korea. +82 (0)2 2072 2661: Email: young21c@snu.ac.kr

Received August 04, 2016; Revised September 20, 2016; Accepted September 21, 2016.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract
Nowadays, digital dentistry is generally applied to prosthodontics with fabrication of inlays or any other fixed prostheses by utilizing CAD/CAM (computer-aided design/computer-aided manufacturing) technology and intraoral scanner. However, in fabricating removable prosthesis, there are some limitations for digital technology to substitute conventional casting method. Therefore, approaching removable prostheses fabrication with CAD/CAM technology would be a meaningful trial. In this case report, Kennedy class III mandibular edentulous patient who was in need of increasing the vertical dimension of occlusion was treated with removable partial denture using CAD and rapid prototyping technique. Surveying and designing the metal framework of the partial denture was performed with CAD, and sacrificial plastic pattern was fabricated with rapid prototyping technique. During the follow up period of nine months, the removable partial denture has provided satisfactory results in esthetics and function.


Keywords: Computer-aided design (CAD); Rapid prototyping; Removable partial denture

Figures


	Fig. 1 Panoramic radiograph at the patient's first visit. Right condylar head and symphysis are fixated with wire due to mandibular fracture from an accident 30 years ago. Periapical lesion at the right mandibular first molar and multiple caries in the mandibular teeth are observed.
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	Fig. 2 Initial intraoral photographs. (A) Maxillary occlusal view, (B) Frontal view showing not enough interocclusal space in the edentulous area, (C) Mandibular occlusal view showing narrow alveolar ridge about 3 mm in the edentulous area.
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	Fig. 3 After the fixed prostheses and surveyed crowns had been delivered, a model fabricated through conventional impression taking and was later scanned with laser. (A) Intraoral photograph after the fixed prostheses were delivered, (B) Complete laser scanned model.
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	Fig. 4 Removable partial denture framework designed by CAD. (A) The degree of undercut can be visualized by the different color scheme show on the diagram, (B) Complete design, (C) Additional structure was introduced to prevent distortion and deformation during investment.
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	Fig. 5 Plastic pattern of RPD framework. (A) Resin pattern of removable partial denture framework was fabricated through rapid prototyping, (B) The resin pattern fitted the model well.
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	Fig. 6 RPD framework fabricated by casting. The framework fits the patient well during try-in.
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	Fig. 7 Definitive prostheses. (A) Maxillary occlusal view, (B) Lateral view (right), (C) Frontal view, (D) Lateral view (left), (E) Mandibular occlusal view.
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	Fig. 8 Panoramic radiographs at 9 months after delivery. There was no specific finding in the radiograph, and the prosthesis showed good adaptability.
	Click for larger image

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