Accuracy of implant impression techniques.
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.
Assif
D
D
Department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv, Israel.
Marshak
B
B
Schmidt
A
A
D000180:Acrylic Resins; D000704:Analysis of Variance; D002133:Calcium Sulfate; D000044:Dental Abutments; D015921:Dental Implants; D003760:Dental Impression Materials; D003761:Dental Impression Technique / Q000295:instrumentation; D017267:Dental Prosthesis Design / Q000295:instrumentation; D003765:Models, Dental; D013193:Stainless Steel; D013314:Stress, Mechanical; D013499:Surface Properties
D000180:Acrylic Resins; D015921:Dental Implants; D003760:Dental Impression Materials; D013193:Stainless Steel; D002133:Calcium Sulfate