J Dent Rehabil Appl Sci.  2017 Jun;33(2):63-70. 10.14368/jdras.2017.33.2.63.

In vitro evaluation methods on adaptation of fixed dental prosthesis

• Lee H
• Lee DH
• Lee KB

• KMID: 2388011
• DOI: http://doi.org/10.14368/jdras.2017.33.2.63

Abstract

Clinically, the fit of fixed prosthesis is an essential element for successful restoration. The fit of prosthesis is largely classified into marginal fit and internal fit, and various methods to assess these have been introduced including microscopic margin measurement, cross-sectional measurement, silicone replica technique, 3-dimensional scanning data superposition, weight technique and micro CT scanning. Thus, this study is aimed at proposing a more convenient and accurate measurement method of fits in a digital environment by comparatively analyzing the advantages and disadvantages of each known method based on existing literature.

Keyword

crown; marginal fit; internal fit; measuring technique

MeSH Terms

Crowns
Dental Prosthesis*
In Vitro Techniques*
Methods*
Prostheses and Implants
Replica Techniques
Silicon
Silicones
Tomography, X-Ray Computed
Silicon
Silicones

Figure

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  Fig. 1 Casting misfit terminology.

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  Fig. 2 Measurement of marginal gap by digital microscope at ×160 magnification (orange color: light body silicone; blue color: medium body silicon; violet color: heavy body silicone).

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  Fig. 3 Three-dimensional replica technique. (A) The 3D surface model from the digitization of the study model used as the control model (CAD reference model; CRM), (B) The point cloud model is the digitization of the light body silicone, (C) The point cloud model is projected onto the surface of the CRM. The distribution of the internal gaps was measured and depicted on the color difference map.

• 

  Fig. 4 Three-dimensional analysis procedure. For three- dimensional qualitative evaluation of the discrepancies in the difference between CAD-reference die and the digitized coping data, best-fit alignment was conducted in the program (Control X, Geomagic GmbH, Stuttgart, Germany) and a color-difference map was made with the superimposition process.

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  Fig. 5 Weight technique procedure. (A) Abutment, (B) Fitting of the crown to the abutment after application of light body silicon, (C) Crown removed from B, (D) Measurement of the weight corresponding to the internal gap.

Reference

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