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Volume 24 , Issue 3
May/June 2011
Pages 264–266

Effect of Preparation Depth Differences on the Marginal Fit of Zirconia Crown Copings: An In Vitro Study

Mehdi Sattari Azar, Dr Med Dent/Karl Martin Lehmann, Dr Med Dent/Helmut Dietrich, Dr Med Dent/Gernot Weibrich, Prof Dr Med Dent/Irene Schmidtmann, MSc/Herbert Scheller, Prof Dr Med Dent

PMID: 21519575

If optical scanning is used for crown fabrication, variability in preparation depth may be a limitation. Therefore, this preliminary laboratory study evaluated marginal fit in relation to preparation depth. Three dies with different preparation depths between the vestibular and oral regions were fabricated. Ten zirconia copings were manufactured for each die, and marginal gaps were examined. Increasing differences in preparation depth influenced the size of the marginal gap between the vestibulo-oral and mesiodistal regions significantly (P < .001). This study shows primarily that differences in preparation depth resulted in decreasing marginal precision. Int J Prosthodont 2011;24:264–266.

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