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THE COMPARATIVE STUDY FOR OCCLUSAL PLANE BETWEEN ARTICULATED CAST MODEL AND CEPHALOGRAM IN ORTHOGANTIHIC SURGERY PATIENTS  

Seo, Kyung-Suk (Dept. of Oral & Maxillofacial Surgery, Daegu Fatima Hospital)
Park, Mi-Hwa (Dept. of Oral & Maxillofacial Surgery, Daegu Fatima Hospital)
Lee, Ju-Hyun (Dept. of Oral & Maxillofacial Surgery, Daegu Fatima Hospital)
Kim, Chul-Hwan (Dept. of Oral & Maxillofacial Surgery, Daegu Fatima Hospital)
Chae, Jong-Moon (Dept. of orthodontics, Daegu Fatima Hospital)
Publication Information
Journal of the Korean Association of Oral and Maxillofacial Surgeons / v.29, no.4, 2003 , pp. 239-244 More about this Journal
Abstract
The common errors in preoperative treatment plan for the orthognathic surgery can be occurred during cast impression, cast mounting procedure with face-bow transfer, surgical stent fabrication, and so on. One of the most common errors exists during mounting process of the model on the articulator. Accurate mounting of dental casts to articulator should be achieved by transferring the 3-dimensional spatial relationship of the maxillary arch to an articulator. A face-bow is used for transfer this relationship to articulator, usually by relating the face-bow to a plane of reference of maxillary cast. The purpose of this study is evaluation of the accuracy of face-bow transferring of maxillary model to the articulator. The maxillary casts of thirty patients for orthognathic surgery were mounted on articulator with an face-bow instrument. The relationship of occlusal plane angle to Frankfort horizontal plane relations were compared the cephalogram with the cast-mounted articulator. As a result of this study, the significant difference between the maxillary occlusal planes angle in the cephalogram and articulator were found. The results were followed, 1. The mean occlusal plane angle in cast-mounted articulator was $13.5^{\circ}\;(SD{\pm}5.4)$. 2. The mean occlusal plane angle in cephalogram was $10.4^{\circ}\;(SD{\pm}4.3)$. 3. The mean difference of occlusal plane angle between cast-mounted articulator and cephalogram was $3.3^{\circ}\;(SD{\pm}4.6)$. According to the result, we should suggest that the occlusal plane angle to Frankfort plane in cast-mounted articulator is more steeper than that of cephalogram. And then, maxillofacial surgeon should try to get a more predictable result by suggesting the proper correction method and mounting the cast accurately.
Keywords
Orthognathic surgery; Occlusal plane angle; Articulator;
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