Adaptability of titanium casting denture base -Especially the effect of difference by the form of retentional lattice-

随着铸造技术的提高，商业纯钛在口腔科领域的应用频率沿着增加，这也是需要解决的一大问题，对商业纯钛铸造义齿的需求也随之上升。然而，关于尺寸精度需要进一步改进。作者将纯钛铸造义齿的变形及其对固位网格形状的适应性作为影响因素之一进行了研究。作者通过实验探索了理想固位格的形式。在第一个实验中，作者检查了轮廓在牙槽顶部停止的模式和牙槽顶部跨越10 mm的模式，分别是无固定型、网状型和阶梯型。无孔型的腭部距牙槽顶10mm时差异较大。我问了一下 ...更多信息 例止于牙槽顶部，超出牙槽顶部10 mm，水平面和正面均向右移位，钛铸造义齿变形大至无孔型。阶梯型试样的长度方向和水平方向的胀缩率差异较大。腭后边缘部距牙槽顶向外超出10mm时阶梯型差异最大。至于作为保持网格的梯型，没有获得优异的结果。该网型获得了长度方向和水平方向的膨胀收缩差异小的优异结果。最佳的类型是保持网格为网格型，轮廓止于牙槽顶部。然后，作者进行了第二次实验，以探索更好的网格类型。在第一次实验中，提出了存在于网孔型孔中的包埋料影响钛的铸造收缩。因此，制作了改变网孔尺寸、数量和孔排列的样品，结果，在网孔尺寸增大的情况下，在通常网孔位置之外给出位置，获得了尺寸变化很小的铸造义齿。少

Applied frequency to the odontology department area of the commercial pure titanium increases along with the improvement of the casting technology which is one of big problems which should be solved, and the demand of the commercial pure titanium casting denture has risen. However, a further improvement is requested about the dimensional accuracy. In this time authors paid attention as one factor taking part in the deformation and the adaptability of the commercial pure titanium casting denture to the form of the retentional lattice. Authors experimented to grope for the forms of a ideal retentional lattice. In the 1st experiment, authors examined both of the pattern that the outline stops in the alveolous top and the pattern that the alveolous top crosses over 10mm about the type of the holded none, the mesh type, and the ladder type. The discrepancy of the palate when exceeding outward from the alveolus top by 10mm of the type of the holed none was large. I was able to ask about the … More case to stop in the alveolus top, excess from the alveolus top by 10mm, and both horizontal planes and frontal sides were displaced right, and the deformation of the titanium casting denture be large to the type of the holed none. The difference of the expansion shrinkage of length and horizontal direction was large in the ladder type. Moreover, after the palate, the discrepancy of the edge part indicated the value with the biggest ladder type when exceeding outward from the alveolus top by 10mm. As for the ladder type as the retentional lattice, an excellent result was not obtained. The mesh type obtained the result in which the difference of the expansion shrinkage of length and horizontal direction was small, and excellent. The best type is that retentional lattice is the mesh type and the outline stops in the alveolus top. Then, authors have done the 2nd experiment to grope for a better mesh type. In the 1st experiment , it was suggested that the investment which existed in the hole of the mesh type influence the casting shrinkage of titanium. Therefore, the sample that the size, number, and the arrangement of the hole of the mesh were changed was manufactured.As a result, in the condition of that the size of mesh was enlarged, and the position was given outside from the usual one, authors obtained the casting denture with little dimensional changes. Less