J Dent Rehabil Appl Sci.  2023 Mar;39(1):9-20. 10.14368/jdras.2023.39.1.9.

Comparative accuracy of implant impression techniques with different splinting materials

• Hong KY
• Shin SY

• KMID: 2549253
• DOI: http://doi.org/10.14368/jdras.2023.39.1.9

Abstract

Purpose
We investigated the effect of open tray impression using pick-up impression coping and close tray impression using transfer impression coping on the accuracy of impression in edentulous patients on their mandibular parts. the effect of material types of pick-up type impression copings for splinting in open tray impression on the accuracy of impression was also evaluated.
Materials and Methods
Two implant fixtures were implanted in parallel in the left molar of the mandibular in the shape of a mandibular partial edentulous model. The 40 individual trays were fabricated using 3D printer. The prepared individual trays were classified into 4 groups (i.e., PN, PG, PH, and TN groups), and a total of 40 impression-takings were conducted. A master cast was connected to a Scan Body. The converted STL file was super-imposed on the scan images of the various groups.
Results
The order of standard deviation values decreased as follows: PN (0.2343 ± 0.0844 mm), TN (0.2192 ± 0.0840 mm), indicating that the high accuracy of impression for TN group. In addition, for the comparison results between the material types used in splinting the open tray impression, the PH group showed a relatively lower standard deviation (0.1910 ± 0.1176 mm) than that of the PN group (0.2343 ± 0.0844 mm), PG group (0.2556 ± 0.1082 mm).
Conclusion
The acrylic resin synthesized by light-induced polymerization exhibited a higher accuracy of impression taking than that of autopolymerizing acrylic resin. Meanwhile, the accuracy of impression taking was not dependent on the implant impression taking method or the presence of connection/fixation of impression copings.

Keyword

accuracy; acrylic resin; impression

Figure

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  Fig. 1 Marking for implant positions on the acrylic resin model (E51-TRM.322; Nissin Dental Prod Inc, Kyoto, Japan).

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  Fig. 2 Dental surveyor engine (A-5III; W&H Co, Buermoos, Austria).

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  Fig. 3 Index formation at the border of acrylic resin model.

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  Fig. 4 (A) Fabrication of individual tray, (B) 3D printing individual tray.

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  Fig. 5 (A) Open tray impression technique with pick-up impression coping (non-splint), (B) Open tray impression technique with pick-up impression coping (splint with GC pattern resin), (C) Open tray impression technique with pick-up impression coping (splint with Herifix), (D) Close tray impression technique with transfer impression coping.

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  Fig. 6 Connecting scan bodies into analog.

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  Fig. 7 STL image analysis (align between scan data).

Reference

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