Dissertation > Medicine, health > Oral Sciences > Oral and maxillofacial surgery > Oral and maxillofacial plastic surgery

The Experimental and Clinical Studies of Midfacial Skeleton Protraction at Its Medium Position

Author HouMin
Tutor LiuChunMing;ZhangHaiZhong
School PLA Postgraduate Medical School
Course Oral Sciences
Keywords Spiral CT Three - dimensional image reconstruction Craniofacial complex Finite Element Method Three-dimensional model Biomechanics
CLC R782.2
Type PhD thesis
Year 2005
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Midface hypoplasia is a common deformity of craniofacial surgery , current treatment methods attached bone graft , Orthodontic , Orthognathic Surgery , as well as traction osteogenesis . Attached bone graft only applies to mild deformity , and the presence of bone resorption and deformity to recur and for the District . Limited amount of advancement orthognathic surgical treatment of bone often require auxiliary graft or mandibular setback . Traction injury to the dentition bearing orthodontic traction lines are somewhat lower end of the midface , large tooth movement , bone mobility , there are teeth drift , root resorption , maxillary rotation shortcomings . Distraction osteogenesis effect quickly obvious traction hard tissue and soft tissue gradual expansion over the same period , especially for malformations serious the bone moving distance of the cases . However, there is trauma , difficult to control traction direction shortcomings . Explore maxillary protraction new method , the study from the point of view of biomechanics , bearing maxilla above , and the median traction the maxillary forward , observe the effect . The study is divided into two parts : experimental study and clinical application . The first section traction skeletal parts in the forward face of experimental studies research purposes : 1 . Explore high digitization craniofacial complex three-dimensional finite element modeling method . 2. Of craniofacial sewn in a the craniofacial complex three-dimensional finite element model . 3 . Comparative analysis of the changes in the biomechanical characteristics of the median skeletal traction and traction to the teeth bearing . Explore the craniofacial complex traction in the different directions in front of the biomechanical changes . Methods: spiral CT scanning technology to obtain the craniofacial complex fault Figure completed digital images via DICOM format conversion combination of direct modeling with the three-dimensional finite element method , the suture to further build on the model . Craniofacial complex model , respectively , to a single tooth bearing dentition bearing traction and median bone before traction comparative analysis to analyze the biomechanical changes . More in-depth measurement traction to the the nasal floor load-bearing bone before , biomechanical changes position traction in different directions . Results : including craniofacial bone , bone , joints and dentition , including the craniofacial complex three-dimensional finite element model . Traction before the piriform aperture end bearing capacity median sagittal displacement surface on the 1 /2

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