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정경민,김종환,홍인표,김현철 대한성형외과학회 2003 Archives of Plastic Surgery Vol.30 No.5
Facial contour consists of facial bony frame, skin and soft tissues overlying facial bone. Facial contouring surgery is a surgery that is perfomed on the face(bone and/or soft tissues) in order to achieve better facial proportion by balancing overall facial lines. During the last 15-years period, we perfomed many facial contouring surgeries. The main surgery perfomed in our clinics were mandible angle resection, zygoma reduction, chin augmentation or reduction, forehead augmentation or reduction. The subsidiary surgery for the purpose of better improving facial balance with main sugery were augmentation or reduction rhinoplasty, double fold formation, epicanthoplasty, augmentation mammoplasty, hair transplantation or removal, facial fat injection or liposuction. It was rare to perfome just one kind of facial contouring surgery. Rather, we perfomed two or more than kinds of facial contouring surgery on different facial parts at the same time together. The reason was that it was convenient to coordinate total balanced facial beauty and achieve a better result. So, we summarized factors to be considered in planning the facial contouring surgery. First, in zygoma reduction, we must do not make a cheek droop. If there was a cheek droop, we must lift the cheek to the line which connecting both tragi. Second, in mandible angle resection, facial contouring line should maintain oval shape without straight line and there should be no remaining angle in the front of mandible. Third, we must consider relationship between face and body (especially breast). Fourth, as much as possible, it is more advisable to perform necessary operations all at the same time.
임플란트 고정체의 platform의 크기에 따른 유한요소법적 응력분석
정경민,정재헌,정승미,Chung Kyung-Min,Chung Chae-Heon,Jeong Seung-Mi 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.5
Statement of Problem : With increasing demand of the implant-supported prosthesis, it is advantageous to use the different platform width of the fixture according to bone quantity and quality of the patients. Purpose : The purpose of this study was to assess the loading distributing characteristics of two implant designs according to each platform width of fixture, under vertical and inclined loading using finite element analysis. Material and method : The two kinds of finite element models were designed according to each platform width of future (4.1mm restorative component x 11.5mm length, 5.0mm wide-diameter restorative component x 11.5mm length). The crown for mandibular first molar was made using UCLA abutment. Each three-dimensional finite element model was created with the physical properties of the implant and surrounding bone. This study simulated loads of 200N at the central fossa in a vertical direction, 200N at the outside point of the central fossa with resin filling into screw hole in a vertical direction and 200N at the buccal cusp in a 300 transverse direction individually Von Mises stresses were recorded and compared in the supporting bone, fixture, and abutment screw. Results : The stresses were concentrated mainly at the cortex in both vertical and oblique load ing but the stresses in the cancellous bone were low in both vertical and oblique loading. Bending moments resulting from non-axial loading of dental implants caused stress concentrations on cortical bone. The magnitude of the stress was greater with the oblique loading. Increasing the platform width of the implant fixture decreased the stress in the supporting bone, future and abutment screw. Increased the platform width of fixture decreased the stress in the crown and platform. Conclusion : Conclusively, this investigation provides evidence that the platform width of the implant fixture directly affects periimplant stress. By increasing the platform width of the implant fixture, it showed tendency to decreased the supporting bone, future and screw. But, further clinical studies are necessary to determine the ideal protocol for the successful placement of wide platform implants.