Objective:To evaluate the effectiveness of three-dimensional(3D)reconstruction software in assessing condyle changes after orthognathic surgery and to clarify 3D changes of condyles and bone remodeling after bimaxillary surgery for skeletal class Ⅲ malocclusion.Methods:In this study,18 patients were enrolled,and spiral CT was taken before surgery(T0),two weeks after surgery(T1),and six months after surgery(T2),respectively.3D reconstruction softwares such as Proplan CMF and mimincs were used to perform skull model reconstruction,puncturing,and calculation of bilateral condyle angle and displacement changes in 3D direction as well as bone remodeling on the upper surface of the condyle in order to analyze the relationship between the degree of mandibular regression and the rotation and displacement of bilateral condyles.Results:The left condyle showed backward and upward movement shortly after the surgery.During the postoperative recovery period(T1-T2),the left condyle moved outwards and downwards,At six months after surgery(T2),the left condyle moved outwards,backwards,and downwards as a whole compared to the condition before surgery(T0-T2).Two weeks after surgery,the right condyle moved outwards,backwards,and upwards.During the postoperative recovery period(T1-T2),the condyle continued to shift downwards on the coronal plane,and moved backwards as a whole six months after surgery compared with that before surgery.The left condyle rotated backwards,outwards and upwards during T0-T1.The long axis of the condyle recovered in the coronal and sagittal plane during postoperative recovery(T1-T2),and still rotated backwards,outwards and upwards six months after surgery compared with that before surgery.The right condyle rotated outwards,forwards and downwards after surgery.Postoperative recovery(T1-T2)showed a trend of recovery to the original direction in horizontal plane,sagittal plane and coronal plane,and postoperative overall(T0-T2)showed outward,backward and upward rotation.The bone absorption of the condyle was mainly in the anteromedial region and osteosis was mainly in the posteromedial region.The degree of mandibular regression B0-B1 was strongly correlated with MPLZ0-2,MPRX0-1 and MPRX1-2.Conclusion:3D reconstruction softwares can be effectively used in the study of condylar changes after orthognathic surgery.Bilateral condylar rotation and displacement occur after surgery for skeletal class Ⅲ malocclusion.The rotation,displacement,and bone remodeling after surgery for bilateral condylar are not consistent,and there is a correlation between the degree of mandibular retreat and the displacement of condylar.
skeletal class Ⅲ malocclusionfacial asymmetrythree-dimensional reconstructioncondyle
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