The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Accuracy of a proposed implant impression technique using abutments and metal framework

  • Lee, Hyeok-Jae (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Lim, Young-Jun (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Kim, Chang-Whe (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Choi, Jung-Han (Department of Prosthodontics, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Kim, Myung-Joo (Department of Prosthodontics, College of Dentistry, Seoul National University)
  • Received : 2010.02.26
  • Accepted : 2010.03.12
  • Published : 2010.03.31
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Abstract

PURPOSE. This study compared the accuracy of an abutment-framework (A-F) taken with open tray impression technique combining cement-on crown abutments, a metal framework and resin cement to closed tray and resin-splinted open tray impression techniques for the 3-implant definitive casts. The effect of angulation on the accuracy of these 3 techniques was also evaluated. MATERIAL AND METHODS. Three definitive casts, each with 3 linearly positioned implant analogs at relative angulations 0, 30, and 40 degrees, were fabricated with passively fitted corresponding reference frameworks. Ten impressions were made and poured, using each of the 3 techniques on each of the 3 definitive casts. To record the vertical gap between reference frameworks and analogs in duplicate casts, a light microscope with image processing was used. Data were analyzed by two-way analysis of variance and the Tukey test. RESULTS. The open tray techniques showed significantly smaller vertical gaps compare to closed tray technique (P < .05). The closed tray and the resin-splinted open tray technique showed significantly different vertical gaps according to the angulation of implant (P < .05), but the A-F impression technique did not (P > .05). CONCLUSION. The accuracy of the A-F impression technique was superior to that of conventional techniques, and was not affected by the angulation of the implants.

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References

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