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首页> 外文期刊>The Journal of Prosthetic Dentistry >Coordinate geometry method for capturing and evaluating crown preparation geometry
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Coordinate geometry method for capturing and evaluating crown preparation geometry

机译：用于捕获和评估牙冠预备几何形状的坐标几何方法

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摘要

Statement of problem. A validated universal method requiring no human input is needed to capture and evaluate preparation geometries in a manner that can be used to see the correlation of different parameters. Purpose. The purpose of this study was to present a method of capturing and evaluating crown preparation geometry. Material and methods. One manually machined acrylic resin block and 9 randomly selected preparations for ceramic complete crowns prepared by general dentists were selected and prepared. The specimens were scanned (3D scanner; Nobel Biocare), and buccolingual and mesiodistal cross section images were collected. The images were imported into digitizing software (Engauge Digitizer 4.1) to convert the outlines into x and y coordinates. Six points were chosen by using a set of algorithms, and the resulting parameters were calculated. Results. The acrylic resin block was milled with a 12 degree total occlusal convergence (TOC) instrument producing a 12.83 degree TOC. For the other specimens, average TOC values ranged from 18 degrees to 52 degrees. The mean average margin width was 0.70 mm, and the mean average base dimension was 6.23 mm. The surface area/volume ratio, resistance length, and limiting taper were also calculated. Conclusions. The method described provides a basis for accurately evaluating preparation geometry without human input.
机译：问题陈述。需要一种不需要人工输入的经过验证的通用方法来捕获和评估制备几何形状，该方法可用于查看不同参数的相关性。目的。这项研究的目的是提出一种捕获和评估牙冠制备几何形状的方法。材料与方法。选择并准备了一个手动加工的丙烯酸树脂块和由普通牙医准备的9种随机选择的陶瓷完整牙冠的制备方法。扫描样品（3D扫描仪; Nobel Biocare），并收集颊舌和近中隔断面图像。图像被导入到数字化软件（Engauge Digitizer 4.1）中，以将轮廓转换为x和y坐标。通过使用一组算法选择六个点，然后计算所得参数。结果。用12度总咬合会聚（TOC）仪器研磨丙烯酸树脂块，产生12.83度的TOC。对于其他样本，平均TOC值范围为18度至52度。平均平均边距宽度为0.70毫米，平均平均底边尺寸为6.23毫米。还计算了表面积/体积比，电阻长度和极限锥度。结论。所描述的方法提供了无需人工输入即可准确评估制备几何形状的基础。

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