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Volume 11 , Issue 2
March/April 1996

Pages 216-222

Accuracy of Implant Impression Techniques

David Assif, DMD/Barry Marshak, BDS, MDS/Avinoam Schmidt, DMD

PMID: 8666454

Three impression techniques were assessed for accuracy in a laboratory cast that simulated clinical practice. The first technique used autopolymerizing acrylic resin to splint the transfer copings. The second involved splinting of the transfer copings directly to an acrylic resin custom tray. In the third, only impression material was used to orient the transfer copings. The accuracy of stone casts with implant analogs was measured against a master framework. The fit of the framework on the casts was tested using strain gauges. The technique using acrylic resin to splint transfer copings in the impression material was significantly more accurate than the two other techniques. Stresses observed in the framework are described and discussed with suggestions to improve clinical and laboratory techniques. (INT J Oral MAXILLOFAC IMPLANTS 1996;11:216-222)

Key words: abutment, autopolymerizing acrylic resin, implant, transfer copings

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