An In Vitro Study to Evaluate the Accuracy of Different Impression Techniques of Implant Supported Prosthesis

Document Type : Original Article

Authors

1 Assistant lecturer, Crown and Bridge department, Faculty of Dental Medicine for Boys, Al-Azhar University.

2 Associate professor, Crown and Bridge department, Faculty of Dental Medicine for Boys, Al-Azhar University.

3 Professor, Crown and Bridge department, Faculty of Dental Medicine for Boys, Al-Azhar University.

Abstract

Purpose: This study was designed to evaluate the dimensional accuracy of different impression techniques of implant-supported fixed dental prosthesis. Materials and Methods: Thirty impressions were made upon a specialized stainless-steel mold containing two parallel implant analogues. The impressions were divided into three groups according to implant impression technique used ten each; group (I) closed tray technique (C), group (II) open tray technique (O) and group (III) splinted open tray technique (OS). After taking impressions, they were poured with type IV dental stone and left for one day before analysis with a stereo microscope. Results: Regarding impression accuracy, there was no statistically significant difference between open tray and splinted open tray technique within the master mold while there was statistically significant difference between closed tray technique within the master mold. There was no statistically significant difference between open tray and splinted open tray technique while there was statistically significant difference between closed tray technique within the other two techniques. Conclusion: Closed tray technique showed more deviation in comparison to the master mold and the other two techniques that affect the final accuracy of multiple implant impression while no significant difference with the open tray technique of both types.

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Al-Azhar Dental Journal for Girls
Volume 5, Supplement
October 2018
Pages 463-470

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