| Determination of the accuracy of three die systems. | |
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MedLine Citation:
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PMID: 2072316 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This article reports the findings of two interrelated projects that measured the accuracy of electroplated, epoxy resin, and polyurethane die materials against a master tooth, using the Michigan Computer Graphics Coordinate Measuring System (MCGCMS). In the first phase, on occlusal die morphology, replications of a master tooth were used to validate the MCGCMS reliability. Eighteen total data sets derived from three silver-plated dies and three epoxy resin dies were then compared with a representative data set of the master tooth. The mean differences for all silver-plated die and epoxy die measurements against the master ranged from -42 to -49 and -46 to -230 microns/mm2, respectively. In the second phase, two epoxy die materials and a polyurethane system were compared with a master tooth in an identical manner. In paired comparisons to the master tooth, mean differences for Epoxydent material, epoxy resin, and polyurethane dies ranged from -147 to -153, -149 to -230, and -56 to -168 microns/mm2, respectively. A Student t test using a CLR ANOVA was performed between the master tooth and the five die systems. A significant difference was revealed between the enamel-silver difference and the enamel-Epoxydent difference data at the 95% confidence level. A significant difference also occurred between enamel-silver and enamel-epoxy resin. It was concluded that silver-plated dies are acceptable replicas of a master tooth. Epoxydent and epoxy resin dies did not provide reliable replications when compared with the silver-plated dies. Epoxy and polyurethane replications, although reported as accurate, were inconclusive. |
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Authors:
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T J Bloem; B Czerniawski; J Luke; B R Lang |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The Journal of prosthetic dentistry Volume: 65 ISSN: 0022-3913 ISO Abbreviation: J Prosthet Dent Publication Date: 1991 Jun |
Date Detail:
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Created Date: 1991-08-22 Completed Date: 1991-08-22 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0376364 Medline TA: J Prosthet Dent Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 758-62 Citation Subset: D; IM |
Affiliation:
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Department of Prosthodontics, University of Michigan, School of Dentistry, Ann Arbor. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Computer Graphics Dental Casting Investment / chemistry Dental Enamel / anatomy & histology Dental Impression Materials Dental Models* Electroplating Epoxy Resins / chemistry* Humans Polyurethanes / chemistry* Polyvinyls Signal Processing, Computer-Assisted Siloxanes Silver / chemistry* Surface Properties Tooth / anatomy & histology* |
| Grant Support | |
ID/Acronym/Agency:
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DE06720/DE/NIDCR NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Dental Casting Investment; 0/Dental Impression Materials; 0/Epoxy Resins; 0/Polyurethanes; 0/Polyvinyls; 0/Siloxanes; 0/vinyl polysiloxane; 7440-22-4/Silver |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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