水平 X 射线束倾斜角度对口腔内放射摄影下颌第一磨牙分叉缺损检测的影响。
The effect of horizontal X-ray beam angulation on the detection of furcation defects of mandibular first molars in intraoral radiography.
机构信息
Department of Periodontology, School of Dentistry, Aichi-Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, 464-8651, Japan.
出版信息
Dentomaxillofac Radiol. 2010 Feb;39(2):85-90. doi: 10.1259/dmfr/99338642.
OBJECTIVES
The aim was to investigate the effect of changes in horizontal X-ray beam angulation in intraoral radiography on the detection accuracy of furcation defects in the mandibular first molar, and to examine the anatomical relationship between the roots and furcation area as a possible cause of changes in detectability.
METHODS
Simulated furcation defects with various depths were created in five mandibular first molars. Intraoral radiographs were taken at various horizontal angulations of the projection beams. The diagnostic accuracies were determined based on receiver operating characteristic analysis. The geometric relationship that might influence the accuracy was investigated through use of a compact cone beam CT in 59 first molar areas.
RESULTS
Although the horizontal angulations showing the highest accuracies were shifted mesially, no differences were found between the angles of -10 degrees and 20 degrees . The relationship between the roots and the furcation area was relevant to the range of angulations showing high detectabilities.
CONCLUSIONS
The angulations traditionally used for detecting proximal caries are also suitable for detecting furcation defects.
目的
本研究旨在探讨口腔内放射摄影中水平 X 射线束倾斜角度的变化对下颌第一磨牙分叉缺损检测准确性的影响，并研究牙根和分叉区域之间的解剖关系，这可能是检测能力变化的原因。
方法
在五颗下颌第一磨牙上模拟具有不同深度的分叉缺损。以不同的投射光束水平倾斜角度拍摄口腔内射线照片。基于接收者操作特性分析确定诊断准确性。通过使用紧凑型锥形束 CT 研究 59 个第一磨牙区域，调查可能影响准确性的几何关系。
结果
尽管显示最高准确性的水平倾斜角度向近中移动，但 -10 度和 20 度之间的角度没有差异。根与分叉区域之间的关系与显示高可检测性的角度范围有关。
结论
传统上用于检测近中龋的角度也适用于检测分叉缺损。
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