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Ying
Wan
Author
Department of Orthodontics
School of Dentistry
Accuracy of condylar position in orthognathic surgery cases treated with virtual surgical planning: an exploratory study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
Spring 2017
2017
Surgery
eng
Master of Science
Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of condylar position in orthognathic surgery cases treated with
virtual surgical planning: an exploratory study
Objectives: To assess the pre- and short-term post-operative positions of the
mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual
Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical
characteristics and condylar positional changes, as well as to quantify the difference
between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively
operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and
10 subjects with conventional surgery planning were selected from a private practice
database retrospectively. 3D models generated from CBCT scans obtained pre-surgically
(T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt
horizontal, superimposed, and registered on the anterior cranial base through a
voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were
manually selected on T1, T2, and VSP models using SlicerCMF (open-source software).
Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D
distance and in its component vectors in the transverse, vertical, and anteroposterior
axes. Results: Study groups were well matched for demographic and surgical characteristics
except for the type of surgery performed in addition to the BSSO. No significant
difference was found between the VSP and conventional group in the magnitude of
translation or rotation of the condyles following surgery. Mandibular shape was the only
surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP
surgical outcomes differed significantly at all measured landmarks and in all dimensions
from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to
condylar position as a result of surgery. The magnitude of condylar torque following
surgery was largely unexplained by surgical factors such as mandibular shape, mandibular
plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical
results differed significantly from VSP-predicted outcomes.
Spring 2017
2017
Surgery
eng
Master of Science
Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting
institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of condylar position in orthognathic surgery cases treated with virtual surgical planning: an exploratory study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
Spring 2017
2017
Surgery
eng
Master of Science
Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of condylar position in orthognathic surgery cases treated with virtual surgical planning: an exploratory study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017-05
2017
Surgery
eng
Master of Science
Masters Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of condylar position in orthognathic surgery cases treated with virtual surgical planning: an exploratory study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of Condylar Position in Orthognathic Surgery Cases Treated with Virtual Surgical Planning: An Exploratory Study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of Condylar Position in Orthognathic Surgery Cases Treated with Virtual Surgical Planning: An Exploratory Study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of Condylar Position in Orthognathic Surgery Cases Treated with Virtual Surgical Planning: An Exploratory Study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of Condylar Position in Orthognathic Surgery Cases Treated with Virtual Surgical Planning: An Exploratory Study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
University of North Carolina at Chapel Hill
Degree granting institution
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of Condylar Position in Orthognathic Surgery Cases Treated with Virtual Surgical Planning: An Exploratory Study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
University of North Carolina at Chapel Hill
Degree granting institution
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of Condylar Position in Orthognathic Surgery Cases Treated with Virtual Surgical Planning: An Exploratory Study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Dentistry (Orthodontics)
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
Ying
Wan
Creator
Department of Orthodontics
School of Dentistry
Accuracy of Condylar Position in Orthognathic Surgery Cases Treated with Virtual Surgical Planning: An Exploratory Study
Objectives: To assess the pre- and short-term post-operative positions of the mandibular condyle in bimaxillary orthognathic surgery cases prepared using Virtual Surgical Planning (VSP). Additional aims are to evaluate the relationship between surgical characteristics and condylar positional changes, as well as to quantify the difference between actual surgical outcome and planned virtual outcome. Methods: 15 consecutively operated subjects with Bilateral Sagittal Split Osteotomies (BSSO) prepared with VSP and 10 subjects with conventional surgery planning were selected from a private practice database retrospectively. 3D models generated from CBCT scans obtained pre-surgically (T1), post-surgically (T2), and from the VSP predictions were then oriented to Frankfurt horizontal, superimposed, and registered on the anterior cranial base through a voxel-based method. Anatomic landmarks on the condyles, maxilla, and mandible were manually selected on T1, T2, and VSP models using SlicerCMF (open-source software). Displacement of corresponding landmarks on T1, T2, and VSP models was measured in both 3D distance and in its component vectors in the transverse, vertical, and anteroposterior axes. Results: Study groups were well matched for demographic and surgical characteristics except for the type of surgery performed in addition to the BSSO. No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. Mandibular shape was the only surgical characteristic found to correlate with condylar yaw (P=0.045, Rz = 0.035). VSP surgical outcomes differed significantly at all measured landmarks and in all dimensions from predicted outcomes. Conclusion: Virtual surgical planning does not prevent changes to condylar position as a result of surgery. The magnitude of condylar torque following surgery was largely unexplained by surgical factors such as mandibular shape, mandibular plane, magnitude of mandibular movement, and rotation of mandibular plane. Actual surgical results differed significantly from VSP-predicted outcomes.
2017
Surgery
eng
Master of Science
Masters Thesis
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Tung
Nguyen
Thesis advisor
George
Blakey
Thesis advisor
Tate
Jackson
Thesis advisor
text
2017-05
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