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Wang, Li,Chen, Ken Chung,Gao, Yaozong,Shi, Feng,Liao, Shu,Li, Gang,Shen, Steve G. F.,Yan, Jin,Lee, Philip K. M.,Chow, Ben,Liu, Nancy X.,Xia, James J.,Shen, Dinggang Published for the American Association of Physicis 2014 Medical physics Vol.41 No.4
<P>Cone-beam computed tomography (CBCT) is an increasingly utilized imaging modality for the diagnosis and treatment planning of the patients with craniomaxillofacial (CMF) deformities. Accurate segmentation of CBCT image is an essential step to generate three-dimensional (3D) models for the diagnosis and treatment planning of the patients with CMF deformities. However, due to the poor image quality, including very low signal-to-noise ratio and the widespread image artifacts such as noise, beam hardening, and inhomogeneity, it is challenging to segment the CBCT images. In this paper, the authors present a new automatic segmentation method to address these problems.</P>
Wang, Li,Ren, Yi,Gao, Yaozong,Tang, Zhen,Chen, Ken-Chung,Li, Jianfu,Shen, Steve G F,Yan, Jin,Lee, Philip K M,Chow, Ben,Xia, James J,Shen, Dinggang Published for the American Association of Physicis 2015 Medical physics Vol.42 No.10
<P>A significant number of patients suffer from craniomaxillofacial (CMF) deformity and require CMF surgery in the United States. The success of CMF surgery depends on not only the surgical techniques but also an accurate surgical planning. However, surgical planning for CMF surgery is challenging due to the absence of a patient-specific reference model. Currently, the outcome of the surgery is often subjective and highly dependent on surgeon's experience. In this paper, the authors present an automatic method to estimate an anatomically correct reference shape of jaws for orthognathic surgery, a common type of CMF surgery.</P>
Adam S.C. Siu,James K.F. Chow,Edward Hui,Mei M. Chong,Michel Dard 대한치과이식임플란트학회 2021 The Korean Academy of Implant Dentistry Vol.40 No.4
Bimaxillary immediate full-arch restorations can be prosthodontically, surgically, and esthetically demanding. State-of-the-art computer- assisted guided surgery can significantly improve the predictability and reliability of such procedures while reducing the chair time for the patient. This case report demonstrates how such procedures can be applied using an industrially outsourced service to assist implant planning and treatment preparation. A 63-year-old partially edentulous female with a failing dentition presented at our clinic. After medical assessment and the patient s request to avoid any edentulous episodes during treatment, a digitally guided bimaxillary full-arch reconstruction with an immediate restoration was performed within one session. The surgical and restorative procedures were performed as planned, allowing an immediate provisional restoration. The comparison of the planned and actual implant positions indicated slight inaccuracies between these positions. These deviations did not affect the immediate provisionalization, functionality, or esthetics of the immediate or final prosthetic rehabilitation. Fully digitally guided workflows represent a valuable tool for the efficient and reliable immediate transition from a failing dentition to a fixed reconstruction. The application of an outsourced and assisted digital planning service allows immediate access to digitally guided surgery and can improve efficiency. Deviations between planned and actual implant positions were most likely related to the rotational degrees of freedom around the teeth used for guide retention.