J Korean Acad Prosthodont.  2017 Apr;55(2):135-143. 10.4047/jkap.2017.55.2.135.

Assessment of the fit of zirconia-based prostheses fabricated with two different scan methods

• Choi HS
• Cho JH

• KMID: 2377181
• DOI: http://doi.org/10.4047/jkap.2017.55.2.135

Abstract

PURPOSE
This research was conducted to compare the marginal and internal fit of zirconia prostheses fabricated with the model scan method and the intraoral scan method.
MATERIALS AND METHODS
In this study, 20 extracted human mandibular first molar was used in the preparation of abutment tooth for the fabrication of zirconia prostheses. In the first group, the model scan method was applied on 10 prepared teeth. In the other group, the intraoral scan method was used on other 10 prepared teeth. Datum of both groups were transmitted to the software system. Afterwards, 20 zirconia prostheses were fabricated using the Ceramill system. Weight technique was used to evaluate the internal gap of the zirconia prostheses. In the Replica technique, marginal gap of the zirconia prostheses were analyzed by optical microscopy. Statistical analysis was based on one-way ANOVA.
RESULTS
Model scan group showed lower average weight than intraoral scan group when weight technique was applied, which has significance (P < .05). Also, model scan group showed significantly lower figures in all 5 measurements of replica technique than intraoral scan group (P < .05).
CONCLUSION
Zirconia prostheses of both groups demonstrated clinically acceptable margin and internal fit. However, model scanned zirconia prostheses showed higher marginal and internal fit than intraoral scanned crowns.

Keyword

Zirconia-based prostheses; Model scan method; Intraoral scan method; Weight technique; Replica technique

MeSH Terms

Crowns
Humans
Methods*
Microscopy
Molar
Prostheses and Implants*
Replica Techniques
Tooth

Figure

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  Fig. 1. Prepared abutment tooth.

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  Fig. 2. Fabrication of 10 master dies.

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  Fig. 3. Scan images from each group. (A) Intraoral scan, (B) model scan.

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  Fig. 4. Design of the zirconia prostheses for each group. (A) Intraoral scan, (B) model scan.

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  Fig. 5. Zirconia prosthesis placed on the prepared abutment tooth.

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  Fig. 6. Silicone film representing the space between the abutment tooth and the zirconia prosthesis.

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  Fig. 7. Stabilized replica after segmentation in the bucco-palatal direction.

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  Fig. 8. Schematic representation of the five predetermined measuring points in the cross-sectional cut of the replica.

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  Fig. 9. Microscopic cross-sectional photograph of a replica. Definition of measuring distances for marginal accuracy: x, horizontal marginal discrepancy; y, vertical marginal discrepancy; a, absolute marginal discrepancy; b, internal gap.

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  Fig. 10. Means of silicone weight measurements for the intraoral scan group and model scan group (n = 10, for each). Error bars represent ± SD.

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  Fig. 11. Means of marginal and internal gaps for the intraoral scan group and model scan groups (n = 10, for each). Error bars represent ± SD.

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