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首页> 外文期刊>Journal of Veterinary Dentistry >Occlusal Angles of Equine Incisors
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Occlusal Angles of Equine Incisors

机译：咬合角度

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The angulation of equine incisors is frequently used as a parameter for dental corrections. However, the term incisor angle is only vaguely defined, and no studies exist presenting a series of reliable measurements in individual incisors of multiple horses. The aim of this study was to establish an exact method to determine incisor angles and to test whether clinically accessible landmarks (facial crest and bars) are suitable to estimate incisor angles. Eighteen horses were used to create 3-dimensional (3D) reconstructions of the skulls from computed tomography (CT) data sets. Reference planes (median and transverse plane) were calculated using defined anatomical landmarks. Subsequently, occlusal planes for incisors and for incisor quadrants were calculated. Occlusal table angles were measured in relation to the reference planes. For each incisor, sagittal and transverse angles were measured. Mean values of individual incisor angles ranged from 3.5° to 6.8° (transverse angle) and from 32.6° to 44.9° (sagittal angle). No significant differences were detected in mean between the left and the right side when teeth in same Triadan positions were compared. However, in individual horses, marked differences between the left and the right side of thejaws occurred. Mandibular incisors showed significantly steeper sagittal angles than maxillary incisors. Furthermore, angles of opposing incisors were correlated with each other. The facial crest and the upper jaw bars featured a curved shape and were therefore of limited use to estimate the angulation of the upper incisors. In contrast, the lower jaw bars were suitable to determine the angulations of lower incisors.
机译：标牌门牙的角度经常用作牙科校正的参数。然而，术语切牙角度仅仅含糊地定义，并且没有研究存在一系列多匹马的各个牙齿的可靠测量。本研究的目的是建立一个精确的方法来确定门牙角度，并测试临床可接近的地标（面部嵴和杆）是否适合估算切牙角度。使用18匹马来创建来自计算机断层扫描（CT）数据集的颅骨的三维（3D）重建。使用定义的解剖标志计算参考平面（中值和横向平面）。随后，计算了切牙和切牙象限的咬合平面。相对于参考平面测量咬合表角度。对于每个切牙，测量矢状和横角。单个切口角的平均值范围为3.5°至6.8°（横向角）和32.6°至44.9°（矢状角）。在比较同一三姑娘位置的牙齿时，左侧和右侧之间的平均值未检测到显着差异。然而，在单独的马匹中，左侧和右侧发生的显着差异发生。下颌门牙表现出明显陡峭的矢状角度，比上颌门牙更陡峭。此外，相反的细胞的角度彼此相关。面部嵴和上颚杆具有弯曲形状，因此用于估计上门牙的角度有限的用途。相反，下颚条适合于确定较低门牙的角度。

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