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KMID : 0362419940320030445
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Journal of Korean Academy of Prosthodontics
1994 Volume.32 No. 3 p.445 ~ p.454
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Effect of impression techniques on accuracy of master casts for implant prostheses
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Hong Eun-Hee
Han Dong-Hoo
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Abstract
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Osseointegrated implant prostheses are to provide normal function without compromising the unique interaction between the tissue and the implant. The essential requirement for the osseointegrated implant prostheses is passive fit of abutment.
Therefore, the impression must be accurate and reproduciable since the resultant master cast precisely duplicates the clinical condition. The purpose of this study was to compare the accuracy of he master casts obtained from five impression techniques. Group 1 : To take impression with indirect technique and Impregum F. Group 2 : To take impression with unsplinted direct technique and Impregum F. Group 3 : To take impression with splinted direct technique and Impregum F. Group 4 : To take impression with unsplinted direct technique and Xanthano. Group 5 : To take impression with splinted dierct technique and Xanthano. @Es The results were as follows: @EN 1. In taking impression of Impregum F, there was no significant difference between to use of indirect technique and unsplinted direct technique. p<0.05) 2. Unsplinted direct technique with Impregum F is less accurate than spiinted direct technique with Impregum F or Xanthano and unsplinted direct technique with Xanthano.(p<0.05). 3. There was no significant difference between splinted direct technique with technique with Impregum F and unsplinted direct technique with Xanthano.(p<0.05). 4. Splinted direct technique reproduce more accurate than unsplinted direct technique.(p<0.05). 5. Impression plaster produced less distortion than polyether.(p<0.05) As a result, splinted direct technique with Xanthano was the most accurate technique As a result, splinted direct technique with Xanthano was the most accurate technique in this study. In addition to dimensinal changes in the materials used, positional errors were also attributed to the mechanical components used in the transfer porocess. Although the errors measured were relatively small, this study demonstrates the potential for distortions with the transfer technique used. Further is indicated that the technique with be able to reproduce the intraoral relationship of implant fixtures reliably and predictably.
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