Abstract
BackgroundWe describe a procedure for diagnosis and planning for orthognatic surgery based on international standards. A special 2D planning based on lateral cephalograms (Axis Orbital Marker Lines System) realize a transmission to the SAM 2P articulator (3D) by means of the Axis Orbital Plane.MethodsFormer intraoperative measurement of the average height of the LeFort I osteotomy plane relative to the molar occlusal plane allow to construct a virtual osteotomy plane in the lateral cephalogram. This is the basis for the development of the Axis Orbital Marker Lines System (AO-MLS).ResultsThe AO-MLS is presented graphically, and in detail, with construction guidelines. The system could be integrated into various lateral cephalometric analysis- and surgical prediction schemes. It forms the basis for a standardized transfer of the 2D planning to the 3D planning in the articulator, and vice versa. This procedure makes it possible to generate surgical planning protocols based on the model surgery, which represent the dislocations in the proximity of the real osteotomy planes.ConclusionsThe Axis Orbital Marker Lines System (software component) in conjunction with the University Münster Model Surgery System (hardware system) increases the predictability of model operations in orthognathic surgery.
Highlights
We describe a procedure for diagnosis and planning for orthognatic surgery based on international standards
The medical indications and contra-indications and the combined pre- and post-surgical orthodontic sequences, as well as informing the patient about the necessary treatment and the risks, will be discussed in an interdisciplinary initial appointment, and during a follow-up appointment, where modifications can be made according to the case
Once the pre-surgical orthodontic treatment has been deemed to be satisfactory, the step is to obtain the necessary records for the final surgical planning: dental casts, mounted in a semi-adjustable articulator (SAM 2P, Schul-Artikulator-München, SAM Präzisionstechnik, Gauting, Germany), using a face-bow-transfer, panoramic x-rays, lateral cephalograms, fotos, and if indicated posterior-anterior cephalograms, cone beam computer tomograms, hand wrist x-rays
Summary
For the final surgical planning, Ehmer et al [15,16] have developed a differentiated model surgery system: Calibrated Double splint - Münster Model Surgery System (German abbreviation: KD-MMS). The development process was not based on experimental research carried out on humans or animals. Written informed consent was obtained from the patient for publication of this report and any accompanying images. An Axis Orbital Marker Lines System (AO-MLS), which could be integrated in every planning process, and a SAM 2P articulator compatible model surgery system, have been combined. This is the basis for the development of the Axis Orbital Marker Line System (AO-MLS)
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