Development of the three-dimensional evaluation method for alveolar ridge and denture of elderly people and its application

老年人牙槽嵴及义齿三维评价方法的研制及应用

• 批准号: 10671830
• 负责人: SADAMORI Shinsuke
• 金额: $ 1.98万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10671830/
• 关键词: elderly people; edentulous alveolar ridge; three-dimensional evaluation; complete denture; distortion after curing; height of the palate; height of the alveolar ridge; 顎堤形態の変化; 義歯形態の多様性; 三次元的寸法変化; 義歯の重合方法; 義歯粘膜面の寸法変化; 人工歯の変位

In this study, the three-dimensional coordinate measuring machine Tristation 600 (NIKON) was examined as the three dimensional evaluation method for the alveolar ridge and dentures using the touch probe (the tip is a sphere of the 0.5mm diameter) which is more useful it measures the center of the sphere as control point. The coordinate system was set using the center point in the globe division (the 4mm diameter) given for the 3 places of the palate of the maxilla edentulous model (402U, NISSIN). X-Y reference plane was set as the plane that passed through these three points. X-axis was parallel the straight line through the rear two points. The origin of this coordinate was the center of the circle that passes through these three points. The reference points were given 11 points in mucosal surface of the upper complete denture and 5 points on the artificial tooth (central incisor, primary bicuspid of right and left, second molar of right and left). These points were set as a hemispher … More ical dent of the 2mm diameter. The accuracy of this measuring method was 5.6 μ m on the X-axis, 2.9 μ m on the Y-axis, 4.7 μ m on Z-axis in the mucosal surface. On the occlusal surface, it was 5.6 μ m on the X-axis, 3.7 μ m on the Y-axis, 7.5 μ m on Z-axis. These values of this method were sufficient for the three-dimensional evaluation method. The measuring periods were the time of working cast, wax denture, just after curing, one day after the water storage, and the storage of 1 week.In order to examine the dimensional accuracy of the complete upper denture with various forms of elderly people, the maxilla edentulous ridge models with U-shape, which had high, middle and low alveolar ridge, were made. On these models, the specimens were cured by heat curing method (JIS) and microwave curing method.As a result of this study, the thickness of each part greatly influenced in the deformation after the curing of complete upper dentures in either curing method. Furthermore it was suggested the degree of the absorption of an alveolar ridge was more affective for the distortion of upper complete dentures comparing to the height of the palate. It was clear that in the microwave curing method, the distortion of mucosal surface of dentures after curing was smaller than that in the heat curing method. Furthermore these distortion in the microwave curing method was less influence than that in heat cured method. Less

在这项研究中，三维坐标测量机Tristation 600（NIKON）被检验作为牙槽嵴和假牙的三维评估方法，使用接触探针（尖端是直径0.5mm的球体），更有用的是它测量球体的中心作为控制点。使用为上颌无牙颌模型（402U，NISSIN）的上颚的 3 个位置给出的球体划分（直径 4mm）的中心点来设置坐标系。 X-Y参考平面被设置为通过这三个点的平面。 X轴平行于通过后两点的直线。该坐标的原点是经过这三个点的圆心。参考点为上颌全口义齿粘膜面11个点和义齿上5个点（中切牙、左右第一二尖牙、左右第二磨牙）。这些点被设置为直径为 2 毫米的半球形凹痕。该测量方法的粘膜表面精度为X轴5.6μm、Y轴2.9μm、Z轴4.7μm。在咬合面上，X轴为5.6μm，Y轴为3.7μm，Z轴为7.5μm。该方法的这些值足以用于三维评价方法。测量周期为工作铸模时、蜡制义齿、固化后、水保存后1天、保存1周。为了检验不同形态老年人全口义齿的尺寸精度，制作了具有高、中、低牙槽嵴的U型上颌无牙颌模型。在这些模型上，标本采用热固化法（JIS）和微波固化法进行固化。本研究的结果是，在这两种固化方法中，各部分的厚度对全口义齿固化后的变形影响很大。此外，与上颚的高度相比，牙槽嵴的吸收程度对上颌全口义齿的变形影响更大。可见，微波固化法固化后义齿粘膜表面的变形小于热固化法。此外，微波固化方法中的这些变形比热固化方法中的影响更小。较少的