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首页> 外文期刊>The Cleft Palate-Craniofacial Journal >Palatal Surface Area of Maxillary Plaster Casts—A Comparison Between Two-Dimensional and Three-Dimensional Measurements
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Palatal Surface Area of Maxillary Plaster Casts—A Comparison Between Two-Dimensional and Three-Dimensional Measurements

机译：上颌石膏铸模的表面积—二维和三维测量的比较

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摘要

Objective: To investigate the relationship between corresponding two-dimensional and three-dimensional measurements on maxillary plaster casts taken from photographs and three-dimensional surface scans, respectively.nnMaterials and Methods: Corresponding two-dimensional and three-dimensional measurements of selected linear distances, curve lengths, and (surface) areas were carried out on maxillary plaster casts from individuals with unilateral or bilateral cleft lip and palate. The relationship between two-dimensional and three-dimensional measurements was investigated using linear regression.nnResults and Conclusions: Error sources in the measurement of three-dimensional palatal segment surface area from a two-dimensional photograph were identified as photographic distortion (2.7%), interobserver error (3.3%), variability in the orientation of the plaster cast (3.2%), and natural shape variation (4.6%). The total error of determining the cleft area/palate surface area ratio was 15%. In population studies, the effect of using two-dimensional measurements is a decrease of discriminating power. In well-calibrated setups, a two-dimensional measurement of the cleft area/palate surface area ratio may be converted to a three-dimensional measurement by use of a multiplication factor of 0.75.
机译：目的：研究从照片和三维表面扫描分别获得的上颌石膏模型的二维和三维测量之间的关系。材料与方法：对选定的线性距离进行二维和三维测量，在具有单侧或双侧唇left裂的个体的上颌石膏模型上进行弯曲长度和（表面）面积的测量。结果和结论：从二维照片测量三维pa段表面积的误差源被确定为摄影畸变（2.7％），观察者之间的误差（3.3％），石膏模型定向的变化（3.2％）和自然形状变化（4.6％）。确定裂口面积/上颚表面积比的总误差为15％。在人群研究中，使用二维测量的效果是降低了辨别力。在经过良好校准的设置中，可通过使用0.75的倍增系数将裂口面积/上颚表面积比的二维测量值转换为三维测量值。

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  • 来源
    《The Cleft Palate-Craniofacial Journal》 |2007年第4期|p.381-390|共10页
  • 作者

    Tron A. Darvann Nuno V. Hermann Bjarne K. Ersbøll;

  • 作者单位

    Dr. Darvann is Research Engineer, 3D Laboratory, University of Copenhagen, Copenhagen University Hospital, Copenhagen, Denmark, and the Technical University of Denmark, Lyngby, Denmark. Dr. Hermann is Associate Professor, Department of Pediatric Dentistry and Clinical Genetics, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark. Dr. Ersbøll is Associate Professor, Informatics and Mathematical Modelling, Technical University of Denmark, Lyngby, Denmark. Dr. Kreiborg is Professor and Chairman, Department of Pediatric Dentistry and Clinical Genetics, School of Dentistry, Faculty of Health Sciences, University of Copenhagen and Department of Clinical Genetics, The Juliane Marie Center, Copenhagen University Hospital, Copenhagen, Denmark. Dr. Berkowitz is Research Director, South Florida Cleft Palate Clinic, Clinical Professor of Pediatrics and Surgery, University of Miami School of Medicine, and Consultant to Plastic Surgery Department, Miami Children's Hospital, all in Miami, Florida;

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  • 正文语种 eng
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  • 关键词

    cleft lip and palate, dental casts, 3D measurement, timing of palatal closure, 2D measurement;

    机译：唇and裂;铸牙;3D测量;closure闭合时间;2D测量;

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