J Korean Acad Prosthodont.  2019 Oct;57(4):490-494. 10.4047/jkap.2019.57.4.490.

The fabrication of abutment crowns for existing removable partial denture using CAD/CAM: A clinical report

• Chae MJ
• Lee CH

• KMID: 2461158
• DOI: http://doi.org/10.4047/jkap.2019.57.4.490

Abstract

Abutment teeth supporting removable partial denture could be faced a number of problems including development of dental caries. If the existing removable partial denture is in clinically acceptable state and the patient does not want to replace the existing removable partial denture, then a new prosthesis for abutment teeth need to be made. The procedure of fabricating a new prosthesis of abutment teeth for existing removable partial denture is complicate and technically challenging. To fabricate the abutment crown, the original cast of patient obtained before any complication to the abutment teeth is required. The original cast should also contain teeth other than the abutment teeth as a reference point. Once the cast is prepared, CAD/CAM could be used to produce retrofitting prosthesis effortlessly and efficiently. This clinical report presents fabricating a crown to fit existing removable partial denture using CAD/CAM for a patient with post and core failure and dislodged prosthesis. The prosthesis had high stability with minimum adjustment yielding satisfying result.

Keyword

Retrofitting; Existing removable partial denture; Computer-aided design and computer-aided manufacturing (CAD/CAM)

MeSH Terms

Crowns*
Dental Caries
Denture, Partial, Removable*
Humans
Prostheses and Implants
Tooth

Figure

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  Fig. 1 Failure of metal ceramic crown with post and core for mandibular left canine and first premolar. (A) Initial view, (B) Dislodged metal ceramic crown with post and core.

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  Fig. 2 Existing removable partial denture.

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  Fig. 3 Cementation of post and core.

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  Fig. 4 (A) Scanned image of original model with dislodged prosthesis, (B) Scanned image of definitive cast of abutment teeth.

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  Fig. 5 (A) Prosthesis region was removed from original model and translocated onto the definitive cast using mandibular incisor as a reference point, (B) The abutment margin was corrected to fit the definitive cast maintaining the occlusion and contour of crown.

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  Fig. 6 Final zirconia crowns.

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  Fig. 7 (A, B) Definitive prosthesis, (C) Existing removable partial denture in place.

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