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KMID : 0362420080460020201
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Journal of Korean Academy of Prosthodontics
2008 Volume.46 No. 2 p.201 ~ p.208
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Comparative accuracy of new implant impression technique using abutments as impression copings with an angulated implant model
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Lee Hyeok-Jae
Kim Chang-Whe
Lim Young-Jun
Kim Myung-Joo
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Abstract
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Statement of problem: A new implant impression technique which use abutments as impression coping, and use resin cement as a splinting material was described. Accuracy of this technique was compared with conventional closed tray and resin splinted open tray technique for a 15˚angled 3-implant model
Material and methods: A dental stone master model with 3 linearly positioned implant analogue and a reference framework which was passively fitted to it were fabricated. The center analogue was perpendicular to the plane of model and the outer analogues had a 15˚angulation forward or backward. 10 closed tray impressions, 10 resin splinted open tray impressions, 10 abutment-resin framework cementation impressions and 10 abutment-metal framework cementation impressions were made with additional silicone material and poured with dental stone. A light microscope with image processing was used to record the vertical gap dimension between reference framework and analogue of duplicated
cast made with each 4 impression techniques. Statistical analysis used one-way ANOVA with post-hoc tests Tukey test
of .05 level of significance
Results: Significant difference in the vertical gap dimension was found between closed tray technique; 74.3 (±33.4)㎛ and resin splinted open tray technique, and two other new technique. (P<.05) Abutment-metal framework
cementation technique;42.5 (±11.9)㎛ was significantly different from resin splinted open tray technique. (P<.05) Abutmentresin framework cementation technique;51.0 (±14.1)㎛ did not differ significantly from resin splinted open tray technique;50.3 (±16.9)㎛. (P>.05)
Conclusion: Within limitations of this study, the accuracy of implant level impressions of resin splinted open
tray technique was superior to that of closed tray technique. A new technique using abutment and metal framework cementation was more accurate than resin splinted open tray technique.
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KEYWORD
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Implant impression, Angulation, Abutment, Cementation
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