[Three-dimensional evaluation of condylar morphology remodeling after orthognathic surgery in mandibular retrognathism by cone-beam computed tomography].
OBJECTIVE
To evaluate the effect of orthognathic surgery on condylar morphology changes by comparing three-dimension surface reconstructions of condyles using cone-beam computed tomography (CBCT) data.


METHODS
In the study, 18 patients with mandible retrognathism deformities were included and CBCT data of 36 temporomandibular joints were collected before surgery and 12 months after surgery. Condyles were reconstructed and superimposed pre- and post-operatively to compare the changes of condylar surfaces. One-sample t test and χ2 test were performed for the analysis of three-dimension metric measurement and condylar head remodeling signs. P<0.05 was considered significant.


RESULTS
The root-mean-square (RMS) of condylar surface changes before and after the surgery was (0.37±0.11) mm, which was significant statistically (P<0.05). The distribution of condylar remodeling signs showed significant difference (P<0.05). Bone resorption occurred predominantly in the posterior area of condylar head and bone formation occurred mainly in the anterior area.


CONCLUSIONS
Three-dimension superimposition method based on CBCT data showed that condylar morphology had undergone remodeling after mandibular advancement.
Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Shuo
S
Chen
Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Xiao-jing
XJ
Liu
Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Zi-li
ZL
Li
Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Cheng
C
Liang
Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Xiao-xia
XX
Wang
Department of Radiology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Kai-yuan
KY
Fu
Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Biao
B
Yi
D001862:Bone Resorption; D054893:Cone-Beam Computed Tomography; D005500:Follow-Up Studies; D006801:Humans; D019186:Mandibular Advancement; D008335:Mandibular Condyle / Q000473:pathology / Q000601:surgery*; D057909:Orthognathic Surgery; D063173:Retrognathia / Q000601:surgery*; D013704:Temporomandibular Joint; D014057:Tomography, X-Ray Computed