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首页> 外文期刊>The Cleft palate-craniofacial journal: official publication of the American Cleft Palate-Craniofacial Association >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：上颌石膏模型的表面积-二维和三维测量之间的比较。

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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. MATERIALS 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. RESULTS 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：研究分别从照片和三维表面扫描获得的上颌石膏模型的相应二维和三维测量值之间的关系。材料与方法：对具有单侧或双侧唇left裂的个体的上颌石膏模型进行相应的二维和三维测量，以选择线性距离，曲线长度和（表面）区域。使用线性回归研究了二维和三维测量之间的关系。结果与结论：从二维照片测量三维pa段表面积的误差源被确定为照片变形（2.7％），观察者间误差（3.3％），石膏模型取向的变化（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％。在人口研究中，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，可以使用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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