Accuracy of model surgery: Evaluation of an old technique and introduction of a new one

A New 3D Tool for Assessing the Accuracy of Bimaxillary Surgery: The OrthoGnathicAnalyser

“…The clinical analyses of ten patients using the OrthoGnathicAnalyser demonstrated that the interocclusal wafer provided a good control of the positioning of the maxilla and mandible on the transverse plane. In line with the findings of previous studies [ 35 – 37 ], the interocclusal wafer had provided far less control in the vertical direction. The vertical discrepancy between the 3D planning and the postoperative position of the maxilla was two to three times higher than in the transverse direction.…”

A New 3D Tool for Assessing the Accuracy of Bimaxillary Surgery: The OrthoGnathicAnalyser

“…The clinical analyses of ten patients using the OrthoGnathicAnalyser demonstrated that the interocclusal wafer provided a good control of the positioning of the maxilla and mandible on the transverse plane. In line with the findings of previous studies [ 35 – 37 ], the interocclusal wafer had provided far less control in the vertical direction. The vertical discrepancy between the 3D planning and the postoperative position of the maxilla was two to three times higher than in the transverse direction.…”

Surgical accuracy of three-dimensional virtual planning: a pilot study of bimaxillary orthognathic procedures including maxillary segmentation

“…4,34,35 This systematic error in superior maxillary repositioning using conventional planning was suggested to be caused by errors in transferring pitch when mounting the plaster cast models in the articulator. [1][2][3][4][5][6][7] This posterior movement may have a correlation with the negative pitch in the maxilla, which could lead to a posterior placement of the incisal edge compared to the planned. However, it is unlikely that the entire difference could be attributed to this minor rotational difference.…”

Predictability of maxillary positioning: a 3D comparison of virtual and conventional orthognathic surgery planning

“…In all but one cases, the vertical movement was undercorrected, which may result in persistence of vertical maxillary excess, increased lower face height and gummy smile. This is not surprising as errors in maxillary impaction are well-known in orthognathic surgery [ 6 , 14 , 19 , 20 , 25 ] and deviations between the predicted and the actual vertical movement of 10 mm have been described [ 14 ].…”

“…For example, an undercorrection in the posterior maxillary impaction (i.e., an error in the inclination of the occlusal plane) coincided with increased anterior positioning of the upper central incisors. This interaction between the inclination of the occlusal plane and the antero-posterior position of the incisors is based on geometric reasons and is also observed in errors caused by face-bow transfer in CSP [ 6 , 11 ]. Against our expectations, this positioning error was also observed in the VSP group.…”

A New 3D Tool for Assessing the Accuracy of Bimaxillary Surgery: The OrthoGnathicAnalyser

“…The clinical analyses of ten patients using the OrthoGnathicAnalyser demonstrated that the interocclusal wafer provided a good control of the positioning of the maxilla and mandible on the transverse plane. In line with the findings of previous studies [ 35 – 37 ], the interocclusal wafer had provided far less control in the vertical direction. The vertical discrepancy between the 3D planning and the postoperative position of the maxilla was two to three times higher than in the transverse direction.…”

Surgical accuracy of three-dimensional virtual planning: a pilot study of bimaxillary orthognathic procedures including maxillary segmentation

“…4,34,35 This systematic error in superior maxillary repositioning using conventional planning was suggested to be caused by errors in transferring pitch when mounting the plaster cast models in the articulator. [1][2][3][4][5][6][7] This posterior movement may have a correlation with the negative pitch in the maxilla, which could lead to a posterior placement of the incisal edge compared to the planned. However, it is unlikely that the entire difference could be attributed to this minor rotational difference.…”

Predictability of maxillary positioning: a 3D comparison of virtual and conventional orthognathic surgery planning

“…In all but one cases, the vertical movement was undercorrected, which may result in persistence of vertical maxillary excess, increased lower face height and gummy smile. This is not surprising as errors in maxillary impaction are well-known in orthognathic surgery [ 6 , 14 , 19 , 20 , 25 ] and deviations between the predicted and the actual vertical movement of 10 mm have been described [ 14 ].…”

“…For example, an undercorrection in the posterior maxillary impaction (i.e., an error in the inclination of the occlusal plane) coincided with increased anterior positioning of the upper central incisors. This interaction between the inclination of the occlusal plane and the antero-posterior position of the incisors is based on geometric reasons and is also observed in errors caused by face-bow transfer in CSP [ 6 , 11 ]. Against our expectations, this positioning error was also observed in the VSP group.…”

A New 3D Tool for Assessing the Accuracy of Bimaxillary Surgery: The OrthoGnathicAnalyser

“…The clinical analyses of ten patients using the OrthoGnathicAnalyser demonstrated that the interocclusal wafer provided a good control of the positioning of the maxilla and mandible on the transverse plane. In line with the findings of previous studies [ 35 – 37 ], the interocclusal wafer had provided far less control in the vertical direction. The vertical discrepancy between the 3D planning and the postoperative position of the maxilla was two to three times higher than in the transverse direction.…”

Surgical accuracy of three-dimensional virtual planning: a pilot study of bimaxillary orthognathic procedures including maxillary segmentation

“…4,34,35 This systematic error in superior maxillary repositioning using conventional planning was suggested to be caused by errors in transferring pitch when mounting the plaster cast models in the articulator. [1][2][3][4][5][6][7] This posterior movement may have a correlation with the negative pitch in the maxilla, which could lead to a posterior placement of the incisal edge compared to the planned. However, it is unlikely that the entire difference could be attributed to this minor rotational difference.…”

Predictability of maxillary positioning: a 3D comparison of virtual and conventional orthognathic surgery planning

“…In all but one cases, the vertical movement was undercorrected, which may result in persistence of vertical maxillary excess, increased lower face height and gummy smile. This is not surprising as errors in maxillary impaction are well-known in orthognathic surgery [ 6 , 14 , 19 , 20 , 25 ] and deviations between the predicted and the actual vertical movement of 10 mm have been described [ 14 ].…”

“…For example, an undercorrection in the posterior maxillary impaction (i.e., an error in the inclination of the occlusal plane) coincided with increased anterior positioning of the upper central incisors. This interaction between the inclination of the occlusal plane and the antero-posterior position of the incisors is based on geometric reasons and is also observed in errors caused by face-bow transfer in CSP [ 6 , 11 ]. Against our expectations, this positioning error was also observed in the VSP group.…”