Sweet D, Bowers C M
Bureau of Legal Dentistry, University of British Columbia, Vancouver, Canada.
J Forensic Sci. 1998 Mar;43(2):362-7.
Physical comparison of a suspect's teeth to a bite mark injury using hollow volume comparison overlays is a common forensic odontology technique. Several methods are used to record characteristics of the size, shape and position of the teeth and to generate overlays. These include computer-based, radiographic, xerographic and hand-traced methods. Five common overlay production methods were compared using digital images of dental study casts as a reference standard. Area of the biting edges of the anterior teeth and relative rotation of each anterior tooth were measured and compared. The computer-based production method was determined to be the most accurate of those studied. It produced accurate representations of the biting edges of the teeth in an objective manner. The radiographic method was determined to be more accurate than the xerographic method with respect to tooth area measurement. The opposite is true with respect to tooth rotation. Hand-traced methods, from either wax impressions of teeth or directly from study casts, were determined to be inaccurate and subjective. It is recommended that forensic odontologists discontinue the use of hand-traced overlays in bite mark comparison cases.
使用中空体积比较叠加图将嫌疑人的牙齿与咬痕损伤进行物理比对是法医牙科学的一种常见技术。有几种方法可用于记录牙齿的大小、形状和位置特征并生成叠加图。这些方法包括基于计算机的、射线照相的、静电复印的和手工描绘的方法。以牙科研究模型的数字图像作为参考标准，对五种常见的叠加图制作方法进行了比较。测量并比较了前牙咬边的面积和每颗前牙的相对旋转情况。在研究的这些方法中，基于计算机的制作方法被确定为最准确的。它以客观的方式准确呈现了牙齿的咬边。就牙齿面积测量而言，射线照相法被确定比静电复印法更准确。就牙齿旋转而言，情况则相反。从牙齿的蜡模或直接从研究模型进行手工描绘的方法被确定为不准确且主观。建议法医牙科学者在咬痕比对案件中停止使用手工描绘的叠加图。
