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首页> 外文期刊>The Journal of Prosthetic Dentistry >Three-dimensional assessment of the reliability of a postural face-bow transfer.
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Three-dimensional assessment of the reliability of a postural face-bow transfer.

机译：姿势性脸弓转移的可靠性的三维评估。

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Statement of Problem. Incorrect 3-dimensional orientation of a dental cast may compromise the functional and esthetic result of prosthetic restorations. Purpose. This study assessed the reliability of a new method to transfer the 3-dimensional orientation of the occlusal plane with a postural face-bow. Material and Methods. The 3-dimensional position of the occlusal plane in 20 subjects (age 20 to 32 years) with a complete dentition in both arches was assessed with a postural face-bow. An irreversible hydrocolloid impression of the maxillary arch was made for each subject and poured in dental stone. The maxillary arch was mounted in an articulator with use of a postural face-bow. The 3-dimensional position of the occlusal plane was then measured and compared to the values obtained with the use of a previously certified, computerized, noninvasive instrument. This instrument digitizes the coordinates of dental and facial landmarks and then calculates the spatial position of the occlusal plane. For each subject, the direct assessment and the face-bow measurement were compared by calculating the absolute difference of the following: the inclination of the occlusal plane relative to the true vertical, frontal plane projection (angle alpha) and sagittal plane projection (angle beta); intercondylar distance; distance of the center of gravity of the anterior part of the maxillary arch to the midpoint of the intercondylar axis; and the maxillary right canine to right condylion distance. Descriptive statistics of the differences were calculated. Results. The postural face-bow appeared reliable and compared well to the computerized assessment, with mean differences ranging from 2.5 degree to 3 degree. Conclusion. In the population tested, a postural face-bow reliably reproduced the spatial orientation of the occlusal plane relative to the true horizontal plane. This position was transferred to an articulator with limited errors.
机译：问题陈述。假牙的3维方向不正确可能会损害修复体的功能和美学效果。目的。这项研究评估了一种新方法的可靠性，该新方法可通过姿势性面部弓形来转移咬合平面的3维方向。材料与方法。用姿势性弓形弓法评估了20个受试者（年龄在20至32岁之间）在两个牙弓中具有完全牙列的咬合平面的3维位置。对每个受试者进行上颌弓的不可逆的水胶体印象并将其倒入牙石中。使用姿势脸弓将上颌弓安装在咬合架上。然后测量咬合平面的3维位置，并将其与使用先前认证的计算机化非侵入性仪器获得的值进行比较。该仪器将牙齿和面部界标的坐标数字化，然后计算咬合平面的空间位置。对于每个受试者，通过计算以下各项的绝对差值来比较直接评估和脸弓测量：咬合平面相对于真实垂直，额平面投影（α角）和矢状平面投影（β角）的倾斜度）; con间距离上颌弓前部重心至con间轴中点的距离;以及上颌右犬到右尖锐湿疣的距离。计算差异的描述统计。结果。姿势弓形显得可靠，并且与计算机评估结果相比较，平均差异范围为2.5度到3度。结论。在测试的人群中，姿势式弓-可靠地再现了咬合平面相对于真实水平面的空间方向。这个位置被转移到一个咬合架，误差有限。

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