J Korean Acad Prosthodont.  2020 Jan;58(1):7-13. 10.4047/jkap.2020.58.1.7.

Marginal and internal discrepancy of 3-unit fixed dental prostheses fabricated by subtractive and additive manufacturing

• Choi JW

• KMID: 2469915
• DOI: http://doi.org/10.4047/jkap.2020.58.1.7

Abstract

PURPOSE
This study was to evaluate marginal and internal discrepancy of 3-unit fixed dental prostheses (FDP) fabricated by subtractive manufacturing and additive manufacturing.
MATERIALS AND METHODS
3-unit bridge abutments without the maxillary left second premolar were prepared (reference model) and the reference model scan data was obtained using an intraoral scanner. 3-unit fixed dental prostheses were fabricated in the following three ways: Milled 3-unit FDP (MIL), digital light processing (DLP) 3D printed 3-unit FDP (D3P), stereolithography apparatus (SLA) 3D printed 3-unit FDP (S3P). To evaluate the marginal/internal discrepancy and precision of the prosthesis, scan data were superimposed by the triple-scan protocol and the combinations calculator, respectively. Quantitative and qualitative analysis was performed using root mean square (RMS) value and color difference map in 3D analysis program (Geomagic control X). Statistical analysis was performed using the Kruskal-Wallis test (α=.05), Mann-Whitney U test and Bonferroni correction (α=.05/3=.017).
RESULTS
The marginal discrepancy of S3P group was superior to MIL and D3P groups, and MIL and D3P groups were similar. The D3P and S3P groups showed better internal discrepancy than the MIL group, and there was no significant difference between the D3P and S3P groups. The precision was excellent in the order of MIL, S3P, and D3P groups.
CONCLUSION
Within the limitation of this study, the 3-unit fixed dental prostheses fabricated by additive manufacturing showed better marginal and internal discrepancy than the those of fabricated by subtractive manufacturing, but the precision was poor.

Keyword

Additive manufacturing; Internal discrepancy; Marginal discrepancy; Precision; Subtractive manufacturing

MeSH Terms

Bicuspid
Dental Prosthesis*
Prostheses and Implants

Figure

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  Fig. 1 Fabrication of 3-unit FDPs (upper, occlusal view; lower, buccal view). (A) MIL: milled 3-unit FDP, (B) D3P: DLP 3D printed 3-unit FDP, (C) S3P: SLA 3D printed 3-unit FDP

• 

  Fig. 2 Color difference maps for qualitative analysis of marginal (upper) and internal discrepancies (lower). (A) MIL: milled 3-unit FDP, (B) D3P: DLP 3D printed 3-unit FDP, (C) S3P: SLA 3D printed 3-unit FDP.

• 

  Fig. 3 Color difference maps for qualitative analysis of inner surfaces. (A) MIL: milled 3-unit FDP, (B) D3P: DLP 3D printed 3-unit FDP, (C) S3P: SLA 3D printed 3-unit FDP.

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