Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 May 19;14(10):2663.
doi: 10.3390/ma14102663.

Marginal and Internal Precision of Zirconia Four-Unit Fixed Partial Denture Frameworks Produced Using Four Milling Systems

Karl Martin Lehmann  1 , Michael Weyhrauch  1 , Monika Bjelopavlovic  1 , Herbert Scheller  1 , Henning Staedt  2 , Peter Ottl  2   3 , Peer W Kaemmerer  4 , Stefan Wentaschek  1
Affiliations

Marginal and Internal Precision of Zirconia Four-Unit Fixed Partial Denture Frameworks Produced Using Four Milling Systems

Karl Martin Lehmann et al. Materials (Basel). .

Abstract

Background: CAD/CAM systems enable the production of fixed partial dentures with small and reproducible internal and marginal gaps.

Purpose: The purpose of this study was to evaluate the reproducibility of the marginal and internal adaptations of four-unit fixed partial denture frameworks produced using four CAD/CAM systems.

Materials and methods: Prepared dies of a master model that simulated the loss of the first left molar were measured. Fifteen frameworks were manufactured using four CAD/CAM systems (A-D). The internal fit was determined by the replica technique, and the marginal gap was determined by microscopy. ANOVA was carried out to detect significant differences, and the Bonferroni adjustment was performed. The global level of significance was set at 5%.

Results: The mean gap size ranged from 84 to 132 µm (SD 43-71 µm). The CAD/CAM systems showed significant variance (p < 0.001), and system A (VHF) showed the smallest gaps. The smallest gaps for each system were in the molar part and in the marginal region of the frameworks (p < 0.001).

Conclusions: The CAD/CAM systems showed significantly different gap sizes, particularly between premolars and molars and among the marginal, axial and occlusal regions. All of the systems are suitable for clinical application.

Keywords: CAD/CAM; FPD; internal fit; marginal fit; zirconia.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Zirconia four-unit framework.
Figure 2
Figure 2
CAM Systems. System (A) (VHF CAM 4-02 Impression), system (B) (Datron D5), system (C) (Cerec MCXL) and system (D) (Roland DWX-50).
Figure 3
Figure 3
Measurement points at the marginal and internal surfaces of a restoration.
See this image and copyright information in PMC

References

    1. Manicone P.F., Iommetti P.R., Raffaelli L. An overview of zirconia ceramics: Basic properties and clinical applications. J. Dent. 2007;35:819–826. doi: 10.1016/j.jdent.2007.07.008. - DOI - PubMed
    1. Piconi C., Maccauro G. Zirconia as a ceramic biomaterial. Biomaterials. 1999;20:1–25. doi: 10.1016/S0142-9612(98)00010-6. - DOI - PubMed
    1. De Almeida I.G., Antunes D.B., Braun N.X., Restani A., Straioto F.G., Galhano G.A. CAD/CAM system influence marginal fit of different ceramic types? Indian J. Dent. Res. 2019;30:127–129. - PubMed
    1. Holloway J.A., Miller R.B. The effect of core translucency on the aesthetics of all-ceramic restorations. PPAD. 1997;9:567–574. - PubMed
    1. Al-Aali K.A., Bin-Shuwaish M.S., Alhenaki A.M., Al Ahdal K., Al-Deeb L., Maawadh A.M., Alhelal A., Al-Shehri H., Vohra F., Abduljabbar T. Influence of milling systems and marginal configurations on the fit of yttrium stabilized tetragonal zirconia polycrystals (Y-TZP)’ copings. J. Appl. Biomater. Funct. Mater. 2020;18 doi: 10.1177/2280800020924514. - DOI - PubMed

LinkOut - more resources