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The Effect of Wettability of VPS Impressions on the Surface Defects on the Impression Materials and its Corresponding Stone Casts
Umeå University, Faculty of Medicine, Department of Odontology.
Umeå University, Faculty of Medicine, Department of Odontology.
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

An impression materials’ wettability is vital for producing an accurate cast, on which the definitive construction can be made. The aims of this study were to evaluate a) water wettability of four vinyl polysiloxane (VPS) impression materials under dry conditions by measuring their contact angles b) the surface details of the impression materials by counting the number of defects on the impressions and the corresponding stone casts c) if there were any significant correlations between a) and b). Twenty specimens were made for the contact angle measurements, five for each impression material, and 20 trays were used for making impressions of a master model for the evaluation of defects on the impressions and the corresponding stone casts. Mean ± SD of contact angles: Imprint: 7.1º ± 1.3; Provil: 55.3º ± 4.7; Flextime: 62.9º ± 7.6; President: 68.4º ± 7.3. Mean ± SD of the number of defects on the impressions and the casts: Flextime: 4.2 ± 2.2 and 12.0 ± 3.6; Provil: 4.8 ± 4.0 and 11.0 ± 1.5; Imprint: 8.8 ± 3.6 and 16.0 ± 5.9; President: 10.0 ± 4.3 and 15.0 ± 6.6. There were significant differences in contact angles between the four materials (p<0.05). Flextime exhibited fewer defects on impressions compared to President and Imprint (p<0.05). There were no significant correlations between the contact angles and the number of defects found on the impressions and the casts (p>0.05). In conclusion, high wettability on impressions under dry conditions was not an indication for small number of defects on the impressions and the corresponding casts in this study

Place, publisher, year, edition, pages
2016.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:umu:diva-131166OAI: oai:DiVA.org:umu-131166DiVA: diva2:1072190
Educational program
Dentistry Programme
Supervisors
Examiners
Available from: 2017-02-08 Created: 2017-02-08Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf