Influence of different spacer thickness and spacer coverage area on the adaptation of Cercon CAD/CAM copings / 华西口腔医学杂志
West China Journal of Stomatology
;
(6): 195-198, 2009.
Article
in Chinese
| WPRIM
| ID: wpr-248274
ABSTRACT
<p><b>OBJECTIVE</b>To evaluate the accuracy of Cercon CAD/CAM system and the influence of different spacer thickness and spacer coverage area on the internal and marginal fit of the copings.</p><p><b>METHODS</b>A stainless steel master model of first molar was replicated. After scanning, designs of copings were made with different spacer thickness and spacer coverage area. There were six groups S10C70, S10C90, S30C70, S30C90, S60C70, S60C90. Measurements of the adaptation were performed with silicone impression material and an image analysis system.</p><p><b>RESULTS</b>Univariate ANOVA showed that variation in the internal fit of copings was related to measuring location, spacer thickness and spacer coverage area. There was significant difference between different spacer coverage area groups, and significant difference between spacer thickness 10 microm and 30 microm groups, 10 microm and 60 microm groups, no significant difference between spacer thickness 30 microm and 60 microm groups. Mean marginal fit was (27.7+/-7.6) microm. There was statistically significant difference between both mesial, distal marginal gaps and both buccal, lingual marginal gaps. No difference between mesial and distal marginal gaps, and between buccal and lingual marginal gaps.</p><p><b>CONCLUSION</b>The accuracy by Cercon CAD/CAM system for the marginal and internal fit of zirconium dioxide copings is well within the range of clinical acceptability. Spacer thickness and spacer coverage area have statistically significant influence on the internal fit.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Zirconium
/
Dental Prosthesis Design
/
Computer-Aided Design
/
Dental Marginal Adaptation
/
Crowns
/
Molar
Limits:
Humans
Language:
Chinese
Journal:
West China Journal of Stomatology
Year:
2009
Type:
Article
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