乳猪肢体牙痕形态学和牙痕损伤的生物力学
发布时间：2019-01-02 14:50
【摘要】：咬痕是指一个体的牙齿和口腔中其他部分一起作用于物体,造成该物体在形态学上发生改变而留下的痕迹。法齿学研究的咬痕主要是遗留在人体组织上的咬痕。人体组织有其特殊的组织学、解剖学特点和复杂的生物力学结构,使咬痕表现出各种比较复杂的形态特征。 以往研究多集中于咬痕分析方法学中的证据搜集技术和比对技术。很少有研究探讨咬痕多变性的机理,使实际案例中咬痕鉴定结论中不确定的因素很多。本研究首先对咬痕相关前牙区牙颌参数进行测量分析,目的希望能为咬痕分析提供依据。然后建立乳猪肢体咬痕模型,对咬痕形态学及其相应软组织力学进行研究。 第一部分收集100例发育正常的成都地区健康青壮年牙颌模型,采用扫描牙模overlay技术—计算机辅助测量对咬痕相关前牙区各形态学参数(牙参数和牙弓参数)进行分析,所得结果如下:前牙及牙弓形态学参数男女性别间无统计学差异,但男性大于女性;上下颌间有统计学差异,上颌大于下颌;同颌左右侧间无统计学差异。并利用PLS法分析上下颌参数,对距离类数据建立了具有较高预测精度的回归模型。 第二部分首先利用万能测试机和自制人牙压头在乳猪肢体上垂直加载,形成牙痕损伤模型。实验分别用切牙压头、尖牙压头在100N、200N、300N载荷值下进行加载,观察不同载荷下不同牙型损伤形成的牙痕在死亡和生存状态下随时间的变化。所得结果如下:切
[Abstract]:A bite mark is a mark left by an individual's teeth acting on an object together with other parts of the mouth, resulting in a morphological change in the object. The bite marks in French dentistry are mainly those left over from human tissues. Human tissue has its special histology, anatomical characteristics and complex biomechanical structure, which makes bite marks show various complicated morphological features. Previous studies have focused on evidence collection and comparison techniques in bite analysis methodologies. There are few studies on the mechanism of bite mark variability, which leads to many uncertain factors in the identification of bite marks in practical cases. The purpose of this study was to measure and analyze the maxillary parameters of the bite-related anterior teeth in order to provide evidence for the analysis of bite marks. Then, the bite mark model of pig limb was established, and the morphology of bite mark and the mechanics of soft tissue were studied. The first part was to collect 100 healthy adult teeth and maxillary models from healthy adults in Chengdu area. The morphological parameters (tooth parameters and arch parameters) of the anterior teeth associated with bite marks were analyzed by scanning tooth model overlay technique and computer aided measurement. The results were as follows: there was no statistical difference in morphological parameters of anterior teeth and dental arch between male and female, but male was larger than female. There was statistical difference between the upper and lower jaw, the maxilla was larger than the mandible, and there was no statistical difference between the left and the right side of the same jaw. The PLS method is used to analyze the upper and lower jaw parameters, and a regression model with high prediction accuracy is established for the distance class data. In the second part, the damage model of tooth mark was established by using universal testing machine and self-made human tooth indenter to load vertically on the limb of suckling pig. In this experiment, the incisor and the canine indentation were loaded under the load of 100Nm ~ 200Nm ~ (300N) respectively. The changes of the tooth marks formed by different tooth type injuries under different loads were observed under the condition of death and survival. The results are as follows:
【学位授予单位】：四川大学
【学位级别】：博士
【学位授予年份】：2004
【分类号】：D919
本文编号：2398634
[Abstract]:A bite mark is a mark left by an individual's teeth acting on an object together with other parts of the mouth, resulting in a morphological change in the object. The bite marks in French dentistry are mainly those left over from human tissues. Human tissue has its special histology, anatomical characteristics and complex biomechanical structure, which makes bite marks show various complicated morphological features. Previous studies have focused on evidence collection and comparison techniques in bite analysis methodologies. There are few studies on the mechanism of bite mark variability, which leads to many uncertain factors in the identification of bite marks in practical cases. The purpose of this study was to measure and analyze the maxillary parameters of the bite-related anterior teeth in order to provide evidence for the analysis of bite marks. Then, the bite mark model of pig limb was established, and the morphology of bite mark and the mechanics of soft tissue were studied. The first part was to collect 100 healthy adult teeth and maxillary models from healthy adults in Chengdu area. The morphological parameters (tooth parameters and arch parameters) of the anterior teeth associated with bite marks were analyzed by scanning tooth model overlay technique and computer aided measurement. The results were as follows: there was no statistical difference in morphological parameters of anterior teeth and dental arch between male and female, but male was larger than female. There was statistical difference between the upper and lower jaw, the maxilla was larger than the mandible, and there was no statistical difference between the left and the right side of the same jaw. The PLS method is used to analyze the upper and lower jaw parameters, and a regression model with high prediction accuracy is established for the distance class data. In the second part, the damage model of tooth mark was established by using universal testing machine and self-made human tooth indenter to load vertically on the limb of suckling pig. In this experiment, the incisor and the canine indentation were loaded under the load of 100Nm ~ 200Nm ~ (300N) respectively. The changes of the tooth marks formed by different tooth type injuries under different loads were observed under the condition of death and survival. The results are as follows:
【学位授予单位】：四川大学
【学位级别】：博士
【学位授予年份】：2004
【分类号】：D919
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