J Korean Acad Prosthodont.  2008 Oct;46(5):470-478. 10.4047/jkap.2008.46.5.470.

The marginal fidelity of Procera(R) AllCeram alumina copings and crowns of patients

• Song YG
• Cho IH
• Lee JH

• KMID: 2000404
• DOI: http://doi.org/10.4047/jkap.2008.46.5.470

Abstract

STATEMENT OF PROBLEM: Use of all-ceramic prostheses fabricated with CAD/CAM systems is increasing in the dentistry. Marginal fidelity in production of all-ceramic restoration has important clinical implications and is a key consideration issue in CAD/CAM production as well. PURPOSE: The objective of this study was to analyse marginal fidelities of Procera(R) Allceram Crown. MATERIAL AND METHODS: On 56 patients treated with Procera(R) system Allceram Crown at Dankook Dental Hospital, marginal discrepancies of 101 abutments were measured by stereomicroscope at coping and final restoration stages. Paired t-test and one-way analysis of variance on marginal discrepancy data were conducted to determine the presence of significant differences between measurement and measuring point stages. RESULTS: Marginal discrepancies of final restoration (45.82 +/- 30.84 micrometer) were lower than alumina coping (53.84 +/- 38.83 micrometer). Furthermore, the differences were found to be statistically significant at 95% confidence level. Anterior marginal discrepancies were lower than posterior marginal discrepancies, but they were not statistically significant. Lingual marginal discrepancies were higher than other measurement sites, and the differences were found to be statistically significant at 95% confidence level. CONCLUSION: Within the conditions of this study, marginal fidelities of Procera(R) Allceram Crown were acceptable, and after porcelain build-up, marginal fitness improved over alumina coping. More careful scanning is needed for better results.

Keyword

CAD/CAM; Procera(R) Allceram crown; Alumina coping; Marginal fidelity; Stereomicroscope

MeSH Terms

Aluminum Oxide
Crowns
Dental Porcelain
Dentistry
Humans
Prostheses and Implants
Aluminum Oxide
Dental Porcelain

Figure

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  Fig. 1. Procera scanner Mod 50 (NobelBiocare, Go¨teborg, Sweden) used for this study.

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  Fig. 2. Margin creation of abutment using Procera system.

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  Fig. 3. Margin adjustment of abutment using Procera system.

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  Fig. 4. Design of alumina coping with Procera system.

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  Fig. 5. Master die and alumina coping.

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  Fig. 6. Stereo microscope SZ-PT® (Olympus Co., Shinjuku, Japan).

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  Fig. 7. Schematic view of measuring points.

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  Fig. 8. Master die and Allceram crown.

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  Fig. 9. Stereomicroscopic view of marginal discrepancy.

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  Fig. 10. Comparison of total mean marginal discrepancies at coping stage and after build-up stage.

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  Fig. 11. Comparison of marginal discrepancies at different measuring points.

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  Fig. 12. Comparison of marginal discrepancies according to measuring points.

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