Proplan cmf 3

When the preoperative orthodontic treatment finished, the next section of OGS was activated. The last digital dentition model of preoperative orthodontic treatment was combined with maxillofacial CT scan (LightSpeed Ultra 16 spiral CT machine, GE Company, USA) to reconstruct the dento-maxillofacial model using ProPlan CMF 3.0 software (Materialise, Leuven, Belgium). Based on this, a virtual surgical plan was developed, and the postoperative occlusal relationship was defined according to the Invisalign simulation, as mentioned in the previous step. Then guides and splints were 3D printed.
Orthognathic surgery, including Le Fort I osteotomy and bilateral sagittal split ramus osteotomy (BSSRO), was performed according to the surgical plan. The clear aligners were removed before the operation in order to avoid obstructions in the process of seating the intraoperative splint. Splints were used to reposition the segmented maxillary and mandibular bone sections, which were subsequently fixed in a new place with titanium plates and cortical bone screws. The final splint was fixed on the maxilla, and intermaxillary elastic distraction was applied to maintain the new occlusal relationship.

All data recorded during the set-up were sent to Materialise (Malakoff, France). All cases included in this study were virtually planned using ProPlan CMF 3.0 software (Materialise, Leuven, Belgium) by the same clinical engineer. The virtual planning was then obtained from a web meeting (Figure 2).

The maxillary and mandibular composite models were matched using bone tissue and 3D scanned tooth models, aligned into a common coordinate system, and then the facial soft-tissue model was also imported into ProPlan CMF 3.0 software (Materialise, Belgium). The measurements presented in our study were similar to those obtained using the method described by Ma, Zhigui [20 (link)]. The measurement system was described as follows: (1) The Frankfort horizontal (FH) plane was defined through the right and left orbitale (Or) and the midpoint of the bilateral porion (Po); (2) The midsagittal reference plane was defined as the plane perpendicular to the horizontal plane passing through the nasion and sella, and then adjusted through the mirror function; (3) The B, Go, Po, Pog, and Pog* points were marked on each side (Figure 2). The definitions of the measurements used in this study are listed in Table 1.