| Influence of prolonged setting time on permanent deformation of elastomeric impression materials. | |
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MedLine Citation:
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PMID: 20416412 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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STATEMENT OF PROBLEM: Upon removal, tear forces occur in various areas of an impression. As a result, thin sulcus details may be permanently deformed, affecting the impression's accuracy. PURPOSE: The purpose of this study was to investigate the effect of the chemistry and prolonged setting time on the permanent deformation of light-body impression materials after stretching. MATERIAL AND METHODS: A dumbbell-shaped mold (2 mm x 4 mm x 75 mm) was used to prepare specimens (n=20) of 6 different impression materials (Affinis Light Body, Aquasil Ultra XLV, Express 2 Light Body Flow Quick, Flexitime Correct Flow, P2 Polyether Light, and Impregum Garant L DuoSoft). After water storage (35 degrees C), either for the manufacturer's suggested setting time or for 5 minutes, specimens were stretched by 80% using a universal testing machine at a crosshead speed of 200 mm/min. The permanent deformation (Deltal (%)) was determined after 2 hours of storage in ambient conditions. A 2-way ANOVA followed by a Games-Howell test was used to analyze the influence of material and storage time (alpha=.05). RESULTS: Polyether materials showed a significantly higher permanent deformation (Deltal>4% to 5%) than vinyl polysiloxane materials (P<.05). Extending the manufacturer's suggested setting time resulted in clinically relevant improvements in elastic recovery for products with a polyether backbone only. CONCLUSIONS: Increasing the setting time might be necessary for impression materials with a polyether backbone to improve elastic recovery. |
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Authors:
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Markus Balkenhol; Sylvia Haunschild; Christina Erbe; Bernd Wöstmann |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of prosthetic dentistry Volume: 103 ISSN: 1097-6841 ISO Abbreviation: J Prosthet Dent Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-04-26 Completed Date: 2010-07-15 Revised Date: - |
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: 288-94 Citation Subset: D; IM |
Affiliation:
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Department of Prosthodontics, Justus Liebig University, Giessen, Germany. markus.balkenhol@dentist.med.uni-giessen.de <markus.balkenhol@dentist.med.uni-giessen.de> |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Dental Impression Materials
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chemistry* Dental Stress Analysis / instrumentation Elastic Modulus Elasticity Elastomers / chemistry* Humans Materials Testing Polyvinyls / chemistry Resins, Synthetic / chemistry Siloxanes / chemistry Stress, Mechanical Surface Properties Temperature Time Factors Water / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Dental Impression Materials; 0/Elastomers; 0/Impregum; 0/Polyvinyls; 0/Resins, Synthetic; 0/SENN polyvinylsiloxane-polyether hybrid; 0/Siloxanes; 0/aquasil; 0/vinyl polysiloxane; 7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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