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Warpage of alumina copings
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This report investigates the cause of warpage in dental copings. Five different mechanisms known to cause differential shrinkage: density gradient, temperature gradient, gravidity, friction and residual stresses were investigated. Experiments have shown that none of these mechanisms, except a density gradient, could be ruled out as a cause of the observed warpage. A density gradient is caused by e.g. inhomogeneous packing and heterogeneities. Within the limitation of the X-ray computed tomography (5%) no gradients could be found. However, smaller gradients could still result in the observed differential shrinkage. Scanner mesurements were used to describe how a possible density gradient could lead to the observed warpage. However, an unknown phenomenon could be a possible cause for the differential shrinkage.

Place, publisher, year, edition, pages
2001.
Keyword [en]
Technology, Dental copings, Warpage, Alumina, Differential shrinkage
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-50736ISRN: LTU-EX--01/013--SELocal ID: 7f6514a9-3074-4c2d-942e-d167f0cb74c9OAI: oai:DiVA.org:ltu-50736DiVA: diva2:1024098
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Citation style
  • apa
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  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • en-GB
  • en-US
  • fi-FI
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