Department of Prosthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
J Appl Oral Sci. 2004 Dec;12(4):358-62. doi: 10.1590/s1678-77572004000400020.
Medial mandibular flexure (MMF) is the functional approximation of hemi-mandibles in jaw opening and protrusion, which may affect conventional or implant-supported arch prostheses.
This study evaluated the intra- and inter-rater reliability of a digital image method for linear measurement of MMF in dentate subjects.
Mandibular occlusal impressions in vinyl polysiloxane during rest and maximum opening were obtained from seven adult volunteers. Each impression and the Mitutoyo digital calipers with a 10mm opening were scanned at a 200% magnification. The images were processed using Adobe Photoshop software to get reference points on contralateral first molars. Linear intermolar measurements were taken using the Image Tool software (UTHSCSA), which was calibrated with the standard opening of the digital calipers. Intermolar distance was measured in triplicate for each image by two independent examiners. MMF was calculated by subtracting the intermolar distance in maximum opening (or protrusion) from the distance in rest position. Data were analyzed by intraclass correlation (ICC) tests for estimating intra- and inter-rater reliability.
MMF values ranged from -0.21 to 0.44mm. Intra-rater ICCs were 0.982 and 0.993, and inter-rater ICC was 0.696.
The present results show excellent intra-rater and good inter-rater reliability of this digital image method for measuring MMF in dentate subjects.
本研究旨在评估一种用于测量有牙颌患者下颌骨弯曲（MMF）的数字图像方法的测量者内和测量者间可靠性。
从 7 名成年志愿者中获取了在休息和最大开口时使用乙烯基聚硅氧烷的下颌咬合印模。每个印模和 Mitutoyo 带 10mm 开口的数字卡尺以 200%的放大倍数进行扫描。使用 Adobe Photoshop 软件处理图像以获取对侧第一磨牙的参考点。使用 Image Tool 软件（UTHSCSA）进行线性颌间测量，该软件通过数字卡尺的标准开口进行校准。由两名独立的检查者对每张图像进行三次颌间距离测量。通过从休息位置的距离中减去最大开口（或突出）时的颌间距离来计算 MMF。使用组内相关系数（ICC）检验分析数据，以评估测量者内和测量者间的可靠性。
MMF 值范围为-0.21 至 0.44mm。测量者内 ICC 为 0.982 和 0.993，测量者间 ICC 为 0.696。
本研究结果表明，该数字图像方法在测量有牙颌患者的 MMF 方面具有极好的测量者内和良好的测量者间可靠性。
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