Marginal and internal fit of cobalt-chromium fixed dental prostheses generated from digital and conventional impressions
2014 (English)In: International Journal of Dentistry, ISSN 1687-8728, E-ISSN 1687-8736, 534382Article in journal (Refereed) Published
Objectives: Digital impressions are increasingly used and have the potential to avoid the problem of inaccurate impressions. Only a few studies to verify the accuracy of digital impressions have been performed. The purpose of this study was to compare the marginal and internal fit of 3-unit tooth supported fixed dental prostheses (FDPs) fabricated from digital and conventional impressions.
Methods: Ten FDPs were produced from digital impressions using the iTero system and 10 FDPs were produced using vinyl polysiloxane (VPS) impression material. A triple-scan protocol and CAD software were used for measuring and calculating discrepancies of the FDPs at 3 standard areas: mean internal discrepancy, absolute marginal gap, and cervical area discrepancy. The Mann-Whitney U test was used for analyzing the results. Results. For conventional and digital impressions, respectively, FDPs had an absolute marginal gap of 147 μ m and 142 μ m, cervical area discrepancy of 69 μ m and 44 μ m, and mean internal discrepancy of 117 μ m and 93 μ m. The differences were statistically significant in the cervical and internal areas (P < 0.001).
Significance: The results indicated that the digital impression technique is more exact and can generate 3-unit FDPs with a significantly closer fit compared to the VPS technique.
Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2014. 534382
IdentifiersURN: urn:nbn:se:oru:diva-56733DOI: 10.1155/2014/534382PubMedID: 24723954ScopusID: 2-s2.0-84897902654OAI: oai:DiVA.org:oru-56733DiVA: diva2:1083948