Combined patterns of soft and hard tissue structure in mandibular prognathism

本研究的目的是建立一个自组织地图（SOM）的软组织和硬组织结构的视觉分类在下颌骨多颌畸形的情况下，显示典型的轮廓。对16个软硬组织结构界标进行了数字化处理。将所有点转换为X-Y值以获得SOM的输入向量。采用自组织算法，计算出4个处理单元的下颌骨侧貌图。结果经过1万次学习，得到2× 2单位的下颌骨侧貌图，生成4个虚拟侧貌。每个虚拟配置文件的字符由 ...更多信息 硬组织特征：下颌平面角低，上颌轻度缺损，下颌前突。软组织特征性表现为轻度面中部发育迟缓和颏部前突。硬组织特征性表现为下颌骨前倾角和下颌骨前突伴鼻唇角变窄。第三单元：硬组织特征性表现为下颌平面角偏大，下颌前突。软组织特征表现为下面部高度增加和颏部前突。第4单元：硬组织特征表现为上颌骨发育不足、下颌平面角偏大、上下切牙后牙槽骨代偿轻微。软组织的特征性功能增加较低的面高和轻度面中部retardation.ConclusionThe结果表明，这张地图是有用的，在建立视觉分类的软，硬组织结构的组合模式的基础上虚拟轮廓在下颌骨多颌畸形。少

Combined patterns of soft and hard tissue structure in mandibular prognathismObjectiveThe purpose of this study was to create a self-organizing map (SOM) for visual classification of soft and hard tissue structure in mandibular prognathism, and to demonstrate the typical profiles in mandibular prognathism cases.MethodsThe lateral cephalometric radiographs of 90 female patients (mean age 22.6±3.8 years) with malocclusion were examined. Sixteen soft and hard tissue structurelandmarks were digitized. All points were converted into X-Y values to obtain input vectors for the SOM. By self-organization algorithm, a mandibular prognathism profile map with 4 processing units was calculated. After represent inputting process of vectors, the soft and hard tissue profiles of all the subjects were entered in the map.ResultsAfter ten thousand learning events, the mandibular prognathism profile map with 2× 2 units was calculated, producing 4 virtual profiles. Each virtual profile was character zed by … More the degree of facial convexity, facial height, mandibular protrusion, maxillary deficiency, upper and lower lip protrusion, and nasolabial angle.Unit 1 : Hard tissue characteristic features were low mandibular plane angle, mild maxillary deficiency and mandibular protrusion. Soft tissue characteristic features were mild mid-face retardation and protrusion of the chin.Unit 2 : Hard tissue characteristic features were anterior inclination of the mandibularramus and mandibular protrusion with narrowing of nasolabial angle in soft tissue. Unit 3 : Hard tissue characteristic features were high mandibular plane angle and mandibular protrusion. Soft tissue characteristic features were increased lower facial height and protrusion of the chin.Unit 4 : Hard tissue characteristic features were maxillary deficiency, high mandibular plane angle and slight deto-alveolar compensation of upper and lower incisors. Soft tissue characteristic features were increased lower facial height and mild mid-face retardation.ConclusionThe results suggest that this map is useful in establishing visual classification of combined patterns of soft and hard tissue structure based on virtual profiles in mandibular prognathism. Less