J Adv Prosthodont.  2016 Aug;8(4):329-332. 10.4047/jap.2016.8.4.329.

Fabrication of a CAD/CAM monolithic zirconia crown to fit an existing partial removable dental prosthesis

• Paek J
• Noh K
• Pae A
• Lee H
• Kim HS

• KMID: 2349342
• DOI: http://doi.org/10.4047/jap.2016.8.4.329

Abstract

Fabricating a surveyed prosthesis beneath an existing partial removable dental prosthesis (PRDP) is a challenging and time-consuming procedure. The computer-aided design/computer-assisted manufacturing (CAD/CAM) technology was applied to fabricate a retrofitted, surveyed zirconia prosthesis to an existing PRDP. CAD/CAM technology enabled precise and easy replication of the contour of the planned surveyed crown on the existing abutment tooth. This technology ensured excellent adaptation and fit of newly fabricated crown to the existing PRDP with minimal adjustments. In this case report, a seventy-year-old male patient presented with fractured existing surveyed crown. Because the existing PRDP was serviceable, new crown was fabricated to the existing PRDP.

Keyword

Computer-aided design/computer-assisted manufacturing (CAD/CAM); Monolithic zirconia crown; Retrofitting; Surveyed crown; Replication

MeSH Terms

Crowns*
Dental Prosthesis*
Humans
Male
Prostheses and Implants
Tooth

Figure

• 

  Fig. 1 Buccal view of abutment preparation for the existing PRDP. Tooth preparation finalized for impression. PRDP framework evaluated intraorally to ensure adequate reduction for the monolithic zirconia crown.

• 

  Fig. 2 Resin pattern fabricated and placed under the framework for the monolithic zirconia crown. Cingulum rest seat, labial retentive undercut, and guiding plane are captured in the resin pattern.

• 

  Fig. 3 Resin pattern evaluated on the working cast die to verify the fit (lingual view).

• 

  Fig. 4 Image of digitized crown after being scanned. Duplicated image of maxillary left central incisor on the prepared tooth of the definitive cast.

• 

  Fig. 5 Distal view of the monolithic zirconia crown.

• 

  Fig. 6 Comparing the contours of the previous crown and resin pattern with the newly fabricated zirconia crown.

• 

  Fig. 7 Framework with definitive zirconia restoration (buccal view). The monolithic zirconia crown was adjusted and cemented.

• 

  Fig. 8 Framework with definitive restoration (occlusal view). The retrofitted zirconia crown is well adapted under the existing PRDP.

Reference

1. Samani S, Mullick SC. A new crown for an existing removable partial prosthesis. Quintessence Int. 1979; 10:35–40.

2. Macpherson JR, Evans DB. Fabricating crowns to fit existing removable partial dentures: an illustration of two techniques. J Prosthodont. 1993; 2:199–205.

3. Silberman DM. An indirect procedure for making a crown under an existing partial denture. J Prosthet Dent. 1993; 69:631–633.

4. Hansen CA, Russell MM. Making a crown to fit accurately under an existing removable partial denture clasp assembly. J Prosthet Dent. 1994; 71:206–208.

5. Helvey GA. Retrofitting crowns to an existing removable partial denture clasp: a simple technique. J Prosthet Dent. 2002; 87:399–402.

6. Seals RR Jr, Stratton RJ. Surveyed crowns: a key for integrating fixed and removable prosthodontics. Quintessence Dent Technol. 1987; 11:43–49.

7. Marchack BW, Chen LB, Marchack CB, Futatsuki Y. Fabrication of an all-ceramic abutment crown under an existing removable partial denture using CAD/CAM technology. J Prosthet Dent. 2007; 98:478–482.

8. Yoon TH, Chang WG. The fabrication of a CAD/CAM ceramic crown to fit an existing partial removable dental prosthesis: a clinical report. J Prosthet Dent. 2012; 108:143–146.

9. Warnick ME. Cast crown restoration of a badly involved abutment to fit an existing removable partial denture. Dent Clin North Am. 1970; 14:631–644.

10. Rudolph H, Salmen H, Moldan M, Kuhn K, Sichwardt V, Wöstmann B, Luthardt RG. Accuracy of intraoral and extraoral digital data acquisition for dental restorations. J Appl Oral Sci. 2016; 24:85–94.