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Journal of Prosthetic Dentistry

Qualitative and quantitative three-dimensional accuracy of a single tooth captured by elastomeric impression materials: An in vitro study

  • Oliver Schaefer
    Correspondence
    Corresponding author: Dr Oliver Schaefer, Jena University Hospital – Friedrich Schiller University Jena, Center for Dental Medicine, Biomaterials Research Group, An der Alten Post 4, 07740 Jena, GERMANY, Fax: +49-3641–934411
    Affiliations
    Senior Scientist, Biomaterials Research Group, Center for Dental Medicine, Jena University Hospital – Friedrich Schiller University Jena, Jena, Germany
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  • Monika Schmidt
    Affiliations
    Associate Professor, Policlinic of Prosthetic Dentistry and Material Science, Jena University Hospital – Friedrich Schiller University Jena, Jena, Germany
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  • Roland Goebel
    Affiliations
    Senior Scientist, Policlinic of Prosthetic Dentistry and Material Science, Jena University Hospital – Friedrich Schiller University Jena, Jena, Germany
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  • Harald Kuepper
    Affiliations
    Professor and Chairman, Policlinic of Prosthetic Dentistry and Material Science, and Managing Director, Center for Dental Medicine, Jena University Hospital – Friedrich Schiller University Jena, Jena, Germany
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      Statement of problem

      The accuracy of impressions has been described in 1 or 2 dimensions, whereas it is most desirable to evaluate the accuracy of impressions spatially, in 3 dimensions.

      Purpose

      The purpose of this study was to demonstrate the accuracy and reproducibility of a 3-dimensional (3-D) approach to assessing impression preciseness and to quantitatively comparing the occlusal correctness of gypsum dies made with different impression materials.

      Material and methods

      By using an aluminum replica of a maxillary molar, single-step dual viscosity impressions were made with 1 polyether/vinyl polysiloxane hybrid material (Identium), 1 vinyl polysiloxane (Panasil), and 1 polyether (Impregum) (n=5). Corresponding dies were made of Type IV gypsum and were optically digitized and aligned to the virtual reference of the aluminum tooth. Accuracy was analyzed by computing mean quadratic deviations between the virtual reference and the gypsum dies, while deviations of the dies among one another determined the reproducibility of the method. The virtual reference was adapted to create 15 occlusal contact points. The percentage of contact points deviating within a ±10µm tolerance limit (PDP10 = Percentage of Deviating Points within ±10µm Tolerance) was set as the index for assessing occlusal accuracy. Visual results for the difference from the reference tooth were displayed with colors, whereas mean deviation values as well as mean PDP10 differences were analyzed with a 1-way ANOVA and Scheffé post hoc comparisons (α=.05).

      Results

      Objective characterization of accuracy showed smooth axial surfaces to be undersized, whereas occlusal surfaces were accurate or enlarged when compared to the original tooth. The accuracy of the gypsum replicas ranged between 3 and 6 µm, while reproducibility results varied from 2 to 4 µm. Mean (SD) PDP10-values were: Panasil 91% (±11), Identium 77% (±4) and Impregum 29% (±3). One-way ANOVA detected significant differences among the subjected impression materials (P<.001).

      Conclusions

      The accuracy and reproducibility of impressions were determined by 3-D analysis. Results were presented as color images and the newly developed PDP10-index was successfully used to quantify spatial dimensions for complex occlusal anatomy. Impression materials with high PDP10-values were shown to reproduce occlusal dimensions the most accurately.
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