J Korean Acad Prosthodont.  2017 Jan;55(1):1-8. 10.4047/jkap.2017.55.1.1.

Accuracy of the CT guided implant template by using an intraoral scanner according to the edentulous distance

• Kang BG
• Kim HJ
• Chung CH

• KMID: 2391542
• DOI: http://doi.org/10.4047/jkap.2017.55.1.1

Abstract

PURPOSE
The purpose of this study is to compare the accuracy of the CT guided implant template that was produced by using an intraoral scanner according to the edentulous distance.
MATERIALS AND METHODS
Five maxillary casts were fabricated using radiopaque acrylic resin with the second premolars, first molars, and second molars missing. Then a virtual cast was acquired by scanning each resin cast. Implant treatment was planned on the missing sites by superimposing the presurgical CT DICOM file and the virtual cast. Then the implants were placed using a surgical template followed by postsurgical CT scan. The distance and angle of the platform and apex between the presurgical implant and postsurgical implant were measured using the X, Y, and Z axis of the superimposed presurgical CT and postsurgical CT via software followed by statistical analysis using Kruskall-Wallis test and Mann-Whitney test.
RESULTS
The implant placement angle error increased towards the second molars but there was no statistically significant difference. The implant placement distance error at the platform and apex also increased towards the second molars and there was a statistically significant error at the second molars.
CONCLUSION
Although the placement angle had no statistically significant difference between the presurgical implant and postsurgical implant, the placement distance at the platform and apex showed a larger error and a statistically significant difference at the second molar implant.

Keyword

CAD/CAM; Digital scan; Guided surgery

MeSH Terms

Bicuspid
Molar
Tomography, X-Ray Computed

Figure

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  Fig. 1. Resin model and implant uesd in this study. (A) Resin model made by VisiJet M3 Stoneplast (3DSYSTEMS), (B) TS III SA (Osstem. Co.).

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  Fig. 2. (A) Presurgical cone beam-CT image, (B) Scan image.

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  Fig. 3. Planning and insertion of implant. (A) Planning on position and angulation of the implant, (B) CT guided implant template, (C) Drilling through the implant template with a drill, (D) Post-surgical cone beam-CT image.

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  Fig. 4. Superimposition of presurgical and postsurgical CBCT scans.

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  Fig. 5. Deviation between virtually planned and actually placed implant. (A) Center of prosthetic platform of implant, and apex refers to center of tip of implant, (B) Deviation between virtually planned and actually placed implant is illustrated for platform, apex, and angulation.

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