Evaluating the marginal fit of zirconia copings with digital impressions with an intraoral digital scanner

Statement of problem Digital impression systems have been developed to overcome the disadvantages associated with conventional impression methods. Purpose The purpose of this study was to compare the marginal fit of zirconia copings designed with the use of an iTero digital scanner with those design...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2014-11, Vol.112 (5), p.1171-1175
Main Authors: An, Shinyoung, DDS, MS, Kim, Sungtae, DDS, PhD, Choi, Hyunmin, BDS, Lee, Jae-Hoon, DDS, PhD, Moon, Hong-Seok, DDS, PhD
Format: Article
Language:English
Subjects:
Calcium Sulfate - chemistry
Chromium Alloys - chemistry
Computer-Aided Design
Crowns
Dental Impression Technique - instrumentation
Dental Marginal Adaptation
Dental Materials - chemistry
Dental Models
Dental Prosthesis Design
Dentistry
Humans
Materials Testing
Polyurethanes - chemistry
Tungsten Compounds - chemistry
Zirconium - chemistry
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Summary:Statement of problem Digital impression systems have been developed to overcome the disadvantages associated with conventional impression methods. Purpose The purpose of this study was to compare the marginal fit of zirconia copings designed with the use of an iTero digital scanner with those designed by the conventional impression technique. Material and methods Thirty identical cast, base-metal dies from 1 maxillary central incisor prepared for a ceramic crown restoration were fabricated. For the conventional impression group (CI), base metal dies (n=10) were replicated as stone dies by means of a conventional impression technique with polyvinyl siloxane material. For the iTero with polyurethane group (iP), base metal dies (n=10) were replicated as polyurethane dies with the iTero digital impression system. For the iTero with no dies group (iNo), base metal dies (n=10) were scanned with the iTero digital impression system, but no dies were fabricated. For each group, 10 zirconia copings were fabricated based on the stone dies (CI group), polyurethane dies (iP group), or stereolithography files (iNo group). The marginal gap of each specimen was measured with a light microscope at ×50 magnification. One-way analysis of variance and the Tukey honestly significant difference test were used for statistical analysis (α=.05). Results Statistically significant differences were found between the CI group and iP group ( P
ISSN:0022-3913
1097-6841
DOI:10.1016/j.prosdent.2013.12.024