Registration for computer-navigated surgery in edentulous patients: a problem-based decision concept.
BACKGROUND
Surgical navigation is a commonly used tool in cranio-maxillofacial surgery. Registration is the key element for precision, and a number of studies have shown different techniques to be accurate. Nonetheless, uncertainty surrounds the special situation in edentulous patients and a practical approach to what can be a challenging problem.


METHODS
Four registration strategies for the Brainlab VectorVision(2) system are presented for surgical navigation of edentulous patients: three landmark-based, point-to-point techniques and one surface-based matching strategy are evaluated.


RESULTS
The methods described differ in overall accuracy as well as in the region covered. In general, the more time-consuming and invasive the technique, the more precise it is. The non-invasive techniques are less precise, and they cover only small regions with sufficient accuracy.


CONCLUSIONS
Taking into account which type of accuracy is clinically relevant and that the whole skull does not always need to be covered with the greatest possible accuracy, all the described techniques have their indications. The simpler and less invasive techniques can spare time, decrease costs, and harm patient. A decision tree is presented to the reader.
Clinic for Cranio-Maxillofacial and Oral Surgery, University Hospital of Zurich, Frauenklinikstrasse 24, CH-8091 Zurich, Switzerland. t.luebbers@gmail.com
Heinz-Theo
HT
Lübbers
Felix
F
Matthews
Wolfgang
W
Zemann
Klaus W
KW
Grätz
Joachim A
JA
Obwegeser
Marius
M
Bredell
D059925:Anatomic Landmarks; D001863:Bone Screws; D003663:Decision Trees; D057918:Fiducial Markers; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods; D007834:Lasers; D009066:Mouth, Edentulous / Q000000981:diagnostic imaging* / Q000601:surgery*; D017090:Occlusal Splints; D019647:Oral Surgical Procedures / Q000379:methods*; D009915:Orbit / Q000033:anatomy & histology; D012886:Skull / Q000000981:diagnostic imaging / Q000601:surgery; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed