Background:Bite mark identification is based on the individuality of a dentition and helps in identifying the perpetrator.The use of three-dimensional(3D)analysis of forensic evidence is highlighted in comparison with...Background:Bite mark identification is based on the individuality of a dentition and helps in identifying the perpetrator.The use of three-dimensional(3D)analysis of forensic evidence is highlighted in comparison with traditional methods.CBCT has been used in registering bite mark on food material.To our knowledge this is the first study where CBCT is used to register bite mark from human forearm.Aims and Objective:To signify the potential of CBCT in registering and analysing the bite mark on human skin and to analyse various identifying parameters.Materials and Method:60 subjects of either sex were asked to bite their own forearm and alginate impression of the maxillary and mandible dentition was taken and cast was poured.Both bitemark and cast was subjected to CBCT scanning and parameters like arch shape,inter canine width,mesio distal dimension of anterior teeth,and individual characteristics like rotation,buccal/lingual tilting of teeth was noted and compared and assigned a score using simplified version ofABFO scoring system.Results:Highly significant result with 56.6%definite match,26.66%probable match and 16.66%possible match were obtained using CBCT.Conclusion:CBCT is a non-destructive,accurate,efficient,objective and reproducible method.Out of all parameter mesio-distal dimension of teeth is the best parameter to judge the bitemark on skin.展开更多
目的为咬痕分析提供正常人前牙及前牙弓参数的依据。方法随机抽取成都地区健康青壮年100例,采用扫描牙颌模型overlay技术-计算机辅助测量对咬痕相关的前牙区各形态学参数进行测量统计,运用偏最小二乘法(partial least squares,PLS)分析...目的为咬痕分析提供正常人前牙及前牙弓参数的依据。方法随机抽取成都地区健康青壮年100例,采用扫描牙颌模型overlay技术-计算机辅助测量对咬痕相关的前牙区各形态学参数进行测量统计,运用偏最小二乘法(partial least squares,PLS)分析上下颌模型数据。结果获得正常人前牙(牙切嵴厚度、牙切嵴宽度、牙切嵴面积及牙角度)和前牙弓(牙弓宽度、牙弓高度、牙弓角度、牙间角度)参数数据;PLS法分析模型中距离类参数预测误差值低于0.1。结论在咬痕比对分析中只有尽可能多的找到特征点,才能提供较准确的判定结果。利用PLS法不仅可分析牙颌模型,还可对咬痕鉴定提供依据。展开更多
文摘Background:Bite mark identification is based on the individuality of a dentition and helps in identifying the perpetrator.The use of three-dimensional(3D)analysis of forensic evidence is highlighted in comparison with traditional methods.CBCT has been used in registering bite mark on food material.To our knowledge this is the first study where CBCT is used to register bite mark from human forearm.Aims and Objective:To signify the potential of CBCT in registering and analysing the bite mark on human skin and to analyse various identifying parameters.Materials and Method:60 subjects of either sex were asked to bite their own forearm and alginate impression of the maxillary and mandible dentition was taken and cast was poured.Both bitemark and cast was subjected to CBCT scanning and parameters like arch shape,inter canine width,mesio distal dimension of anterior teeth,and individual characteristics like rotation,buccal/lingual tilting of teeth was noted and compared and assigned a score using simplified version ofABFO scoring system.Results:Highly significant result with 56.6%definite match,26.66%probable match and 16.66%possible match were obtained using CBCT.Conclusion:CBCT is a non-destructive,accurate,efficient,objective and reproducible method.Out of all parameter mesio-distal dimension of teeth is the best parameter to judge the bitemark on skin.
文摘目的为咬痕分析提供正常人前牙及前牙弓参数的依据。方法随机抽取成都地区健康青壮年100例,采用扫描牙颌模型overlay技术-计算机辅助测量对咬痕相关的前牙区各形态学参数进行测量统计,运用偏最小二乘法(partial least squares,PLS)分析上下颌模型数据。结果获得正常人前牙(牙切嵴厚度、牙切嵴宽度、牙切嵴面积及牙角度)和前牙弓(牙弓宽度、牙弓高度、牙弓角度、牙间角度)参数数据;PLS法分析模型中距离类参数预测误差值低于0.1。结论在咬痕比对分析中只有尽可能多的找到特征点,才能提供较准确的判定结果。利用PLS法不仅可分析牙颌模型,还可对咬痕鉴定提供依据。
