Accuracy of CAD/CAM-guided surgical template implant surgery on human cadavers: Part I

Pettersson, Andreas; Kero, Timo; Gillot, Luc; Cannas, Bernard; Fäldt, Jenny; Söderberg, Rikard; Näsström, Karin

doi:10.1016/S0022-3913(10)60072-8

« Previous Next »Journal of Prosthetic Dentistry
Volume 103, Issue 6 , Pages 334-342, June 2010

Accuracy of CAD/CAM-guided surgical template implant surgery on human cadavers: Part I

Andreas Pettersson, BSc
- PhD student, Section for Image and Functional Odontology, Department of Dental Medicine, Karolinska Institute, Huddinge, Sweden
- Corresponding author: Mr Andreas Pettersson, Karolinska Institute, Section for Image and Functional Odontology, Department of Dental Medicine, Alfred Nobels Allé 8, Box 4064, SE-14104, Huddinge, SWEDEN, Fax: +46 87795301
Timo Kero, MSc
- PhD student, Department of Product and Production Development, Chalmers University of Technology, Göteborg, Sweden
Luc Gillot, DDS
- Clinical Instructor, Laboratory of Anatomy, Odontological Faculty, University Paris Descartes, Paris, France
Bernard Cannas, DDS
- Clinical Instructor, Laboratory of Anatomy, Odontological Faculty, University Paris Descartes, Paris, France
Jenny Fäldt, PhD
- Senior Scientist, Early Development, Nobel Biocare AB, Göteborg, Sweden
Rikard Söderberg, PhD
- Professor, Head of Department of Product and Production Development, and Director, Wingquist Laboratory, Chalmers University of Technology, Göteborg, Sweden
Karin Näsström, PhD, DDS
- Department Chair, Section for Image and Functional Odontology, Department of Dental Medicine, Karolinska Institute, Huddinge, Sweden

Statement of problem

An optimal method for approaching the clinical surgical situation, when using preoperatively, virtually planned implant positioning, is to transfer data to a CAD/CAM-guided surgical template with the definitive position of the implant placed after surgery. The accuracy of CAD/CAM-guided surgeries must be determined to provide safe treatment.

Purpose

The purpose of this study was to compare the deviation between the position of virtually planned implants and the position of implants placed with a CAD/CAM-guided surgical template in the mandible and the maxilla in human cadavers.

Material and methods

Ten maxillae and 7 mandibles, from completely edentulous cadavers, were scanned with CT, and 145 implants (Brånemark RP Groovy) were planned with software and placed with the aid of a CAD/CAM-guided surgical template. The preoperative CT scan was matched with the postoperative CT scan using voxel-based registration. The positions of the virtually planned implants were compared with the actual positions of the implants. Data were analyzed with a t test (α=.05).

Results

The mean measurement differences between the computer-planned implants and implants placed after surgery for all implants placed were 1.25 mm (95% CI: 1.13-1.36) for the apex, 1.06 mm (95% CI: 0.97-1.16) for the hex, 0.28 mm (95% CI: 0.18-0.38) for the depth deviation, 2.64 degrees (95% CI: 2.41-2.87) for the angular deviation, and 0.71 mm (95% CI: 0.61-0.81 mm) for the translation deviation.

Conclusions

The results demonstrated a statistically significant difference between mandibles and maxillae for the hex, apex, and depth measurements in the variation between the virtually planned implant positions and the positions of the implants placed after surgery with a CAD/CAM-guided surgical template. (J Prosthet Dent 2010;103:334–342)