| The effect of seating velocity on pressure within impressions. | |
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MedLine Citation:
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PMID: 18992572 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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STATEMENT OF PROBLEM: Oral mucosa can distort under impressions. To reduce or control mucosal distortion, modern impression techniques aim to reduce or control the impression pressure. If changing seating velocity significantly changes pressure, then this effect should be considered for clinical impressions of mucosa. PURPOSE: The purpose of this study was to investigate the relationship between seating velocity and pressure generation during simulated impressions. MATERIAL AND METHODS: Vinyl polysiloxane impression material (Express) was placed between 2 approximating discs in a universal testing machine. The velocity at which the discs approximated was varied. The 7 selected seating velocities were 0.75 mm/s, 1 mm/s, 1.25 mm/s, 1.5 mm/s, 2 mm/s, 2.5 mm/s, and 3 mm/s. The pressure generated at the center of the disk was recorded. Five separate recordings were made for each velocity. One-way ANOVA and post hoc tests (Tukey B and Dunnett T3) (alpha=.05) were used to evaluate peak pressure data at each velocity. RESULTS: The mean (SD) of the recorded pressures for each velocity were 239 (6.67) KPa, 273 (14.89) KPa, 347 (11.97) KPa, 425 (19.73) KPa, 487 (17.84) KPa, 547 (21.25) KPa, and 624 (32.60) KPa, respectively. As the velocity increased, there was a significant (P<.001) concurrent increase in peak pressure. CONCLUSIONS: In this in vitro experiment, changing the velocity of seating had a significant effect on the peak pressure produced during simulated impressions. |
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Authors:
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T Paul Hyde; Helen Craddock; Paul Brunton |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of prosthetic dentistry Volume: 100 ISSN: 1097-6841 ISO Abbreviation: J Prosthet Dent Publication Date: 2008 Nov |
Date Detail:
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Created Date: 2008-11-10 Completed Date: 2009-02-09 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: 384-9 Citation Subset: D; IM |
Affiliation:
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Restorative Dentistry, Leeds Dental Institute, University of Leeds, Leeds, United Kingdom. T.P.Hyde@Leeds.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Dental Impression Materials* Dental Impression Technique* Dental Stress Analysis Elasticity Mouth Mucosa* Polyvinyls Pressure Rheology Siloxanes Viscosity |
| Chemical | |
Reg. No./Substance:
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0/Dental Impression Materials; 0/Polyvinyls; 0/Siloxanes; 0/vinyl polysiloxane |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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