J Adv Prosthodont.  2017 Aug;9(4):265-270. 10.4047/jap.2017.9.4.265.

Evaluation of internal fit of interim crown fabricated with CAD/CAM milling and 3D printing system

• Lee WS
• Lee DH
• Lee KB

• KMID: 2398073
• DOI: http://doi.org/10.4047/jap.2017.9.4.265

Abstract

PURPOSE
This study is to evaluate the internal fit of the crown manufactured by CAD/CAM milling method and 3D printing method.
MATERIALS AND METHODS
The master model was fabricated with stainless steel by using CNC machine and the work model was created from the vinyl-polysiloxane impression. After scanning the working model, the design software is used to design the crown. The saved STL file is used on the CAD/CAM milling method and two types of 3D printing method to produce 10 interim crowns per group. Internal discrepancy measurement uses the silicon replica method and the measured data are analyzed with One-way ANOVA to verify the statistic significance.
RESULTS
The discrepancy means (standard deviation) of the 3 groups are 171.6 (97.4) µm for the crown manufactured by the milling system and 149.1 (65.9) and 91.1 (36.4) µm, respectively, for the crowns manufactured with the two types of 3D printing system. There was a statistically significant difference and the 3D printing system group showed more outstanding value than the milling system group.
CONCLUSION
The marginal and internal fit of the interim restoration has more outstanding 3D printing method than the CAD/CAM milling method. Therefore, the 3D printing method is considered as applicable for not only the interim restoration production, but also in the dental prosthesis production with a higher level of completion.

Keyword

CAD/CAM milling system; 3D printing system; Interim crown; Fitness

MeSH Terms

Crowns*
Dental Prosthesis
Methods
Printing, Three-Dimensional*
Silicon
Stainless Steel
Silicon
Stainless Steel

Figure

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  Fig. 1 (A) Master model (metal abutment), (B) Working model (stone abutment).

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  Fig. 2 Interim crown design. (A) Multi die scan, (B) Margin set-up, (C) Cement space set-up, (D) Tooth placement, (E) Margin modification, (F) Merge and save restoration.

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  Fig. 3 (A) 3D Milling system (Zirkonzahn), (B) Manufactured crown.

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  Fig. 4 (A) 3D printing system (Stratasys), (B) Manufactured crown.

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  Fig. 5 (A) 3D printing system (Dentis), (B) Manufactured crown.

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  Fig. 6 Divided surface (A) and measured position (B) of the silicone replica.

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  Fig. 7 Mean and standard deviation of discrepancy following the measurement point from each group (Unit: µm).

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