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Stress Distribution following Rapid Maxillary Expansion using Different Finite Element Model according to Hounsfield Unit Value in CT Image  

Yoon, Byung-Sun (Department of Orthodontic Dentistry, Graduate School, Dankook University)
Cha, Kyung-Suk (Department of Orthodontic Dentistry, Graduate School, Dankook University)
Chung, Dong-Hwa (Department of Orthodontic Dentistry, Graduate School, Dankook University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.23, no.4, 2007 , pp. 313-326 More about this Journal
Abstract
With rising prevalency of mouth breathing children caused by developing civilization and increasing pollution, there are many maxillary transverse discrepancy patients with undergrowth of maxilla. For improving this, maxillary mid-palatal suture splitting was often performed. The purpose of this study was to analyse the stress distribution on the craniofacial suture and cranium after rapid maxillary expansion by finite element model. The boy(13Y6M) was chosen for taking computed-tomography for finite element model. Three-dimensional model of maxilla, first premolar, first molar, buccal and lingual part of rapid maxillary expansion were constructed. 1. The alveolar bone adjacent to the first molar and the first premolar that was affected directly by rapid maxillary expansion was displaced laterally approximately 4.04mm at maximum. The force decreased toward anterior region and frontal alveolar bone displaced laterally about 3.18mm. 2. A forward maximum displacement was exhibited at zygomatic process middle region. 3. At maximum, maxillary median part experienced 0.973mm downward repositioning and 0.65mm upward repositioning at lateral alveolar bone. 4. Von mises stress was observed the largest stress distribution around teeth and zygomatic buttress. 5. The largest tensile force was observed around alveolar bone of teeth, while compression force was observed at zygomatic buttress.
Keywords
computed tomography; finite element model; hounsfield unit; rapid maxillary expansion; stress distribution;
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