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THE DIMENSIONAL CHANGE OF CAST IMPLANT BARS AFTER LABORATORY PROCEDURE

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Authors
Kwon, Ji-Yung; Kim, Chang-Whe; Lim, Young-Jun; Kim, Myung-Joo
Issue Date
2007
Publisher
대한치과보철학회
Citation
대한치과보철학회지 2007;45(3):354-361
Keywords
Cast implant barCoordinate measuring machineGap distancePassive fit
Abstract
Statement of Problems. The precision of fit between the bearing surfaces of implant abutments and the prosthesis framework has been considered fundamental to implant prosthodontic protocol. Purpose. The study aimed to investigate the effect of laboratory procedure on the dimensional accuracy of cast implant bars. Material and methods Thirty implant bars were fabricated on a metal master model. The gap distances were measured at the right implant abutment replica-gold cylinder interface after casting procedure. The bar length data of precasting and postcasting state were collected and analyzed. Results. The mean gap distance found after casting was for buccal side, for distal side and for the lingual side. The mean bar length was at precasting measurement, at postcasting measurement. The mean change of bar length was . Conclusion. Even though the techniques used in this study strictly followed the guidelines established in the literature, the 30 cast implant bars evaluated all yielded gap distances that were beyond acceptable accuracy. There was a statistically significant difference between precasting and postcasting bar length (P<0.01). There was a decreasing tendency in bar length after casting procedure. It was necessary to correct this dimensional change from laboratory procedure by some corrective methods.
ISSN
0301-2875
Language
English
URI
http://hdl.handle.net/10371/47960
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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