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EXPERIMENTAL IMPRESSION TRAY FABRICATED WITH Ni-Ti SHAPE MEMORY ALLOY

镍钛形状记忆合金实验印模托盘

基本信息

批准号：
10557180
负责人：
KOHNO Atsushi
金额：
$ 4.03万
依托单位：
TSURUMI UNIV.SCHOOL OF DENTAL MEDICIN
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10557180/
关键词：
IMPRESSION TRAY SHAPE MEMORY ALLOY NI-TI ALLOY 形状記憶合金板

项目摘要

We often experience a model fracture due to the elasticity of impression materials, when a stone model is removed from the impression. If a shape memory alloy is used for tray material, we considered, stone model might be able to easily remove from the impression tray without model fracture. A Ni-Ti shape memory alloy plate was developed by Furukawa electric Co. and we used this alloy plate to fabricate a small experimental impression tray. This experimental tray made of the shape memory alloy was fabricated in a box shape of 30×30×15mm and the thickness of tray was 0.67mm.(Pull-out test of the stone model from the impression)The mandible dental study model (D15FE-500A, Nissin) was used for an impression taking. The silicone impression material (Exafine, GC) was injected around the model with four posterior teeth and the tray was then positioned. After setting the material, a definite weight of stone (New Fujirock, GC) was cast into the impression. The pull-out force before recovery of … More the shape memory was 23.5 (4.0) N and showed an equivalent value to the commercially available tray of 23.5 (2.0) N.However after recovery of the shape memory, the force obtained was 15.7 (2.0) N.(Durability of the shape memory effect of the tray)After the tray was recovered at 70℃, the tray had to be corrected by up to 20mm in width by hand each time. The width by recovery was 30mm at initial, 24mm after 100 cycles and 23.1mm after 5,000 cycles. However, by the heat treatment for shape memory effect, the tray recovered to the initial width. In addition, the tray was heated to 132℃ for 20 min in autoclave to simulate sterilization process, then the oreviously descrived recovery procedure was conducted. There was no change in the ability of recovery after 100 cycles of heating.(Force required for pull-out the stone model from the impression)Impressions were made using three kinds of study models that had several missing teeth. The easiness for removing stone models was compared between memory shaped tray and conventional tray. Specimens were made according to common impression taking and gypsum pouring, As the result, removal of the stone model from the experimental tray was easier than that from the conventional tray. Three specimens were fractured in the group of conventional tray, contrary there was no fractured specimens in the group of experimental tray. From the above fact, the shape memory tray seems to be useful for clinical use. Less

当从印模中取出石模型时，由于印模材料的弹性，我们经常会遇到模型断裂的情况。我们认为，如果托盘材料使用形状记忆合金，石质模型可能能够轻松地从印模托盘上取下，而不会导致模型断裂。古河电气公司开发了镍钛形状记忆合金板，我们用这种合金板制作了小型实验印模托盘。该实验托盘由形状记忆合金制成，形状为30×30×15mm的盒子形状，托盘厚度为0.67mm。（石模型从印模中的拔出测试）使用下颌骨研究模型（D15FE-500A，Nissin）进行印模。将硅胶印模材料 (Exafine, GC) 注射到具有四颗后牙的模型周围，然后放置托盘。材料凝固后，将一定重量的石头（New Fujirock，GC）浇铸到印模中。形状记忆恢复前的拔出力为23.5（4.0）N，与市售托盘的23.5（2.0）N相当。然而，形状记忆恢复后，获得的力为15.7（2.0）N。（托盘形状记忆效果的耐久性）托盘在70℃下恢复后，必须用手将托盘每次校正最多20mm的宽度时间。恢复宽度初始为30mm，100次循环后为24mm，5,000次循环后为23.1mm。然而，通过形状记忆效应的热处理，托盘恢复到初始宽度。此外，将托盘在高压灭菌器中加热至132℃并保持20分钟以模拟灭菌过程，然后进行前述的恢复程序。 100次加热循环后恢复能力没有变化。（将石模型从印模中拔出所需的力）使用三种缺失几颗牙齿的研究模型制作印模。比较了记忆形状托盘和传统托盘去除石模型的容易程度。按照普通取模和石膏浇注的方式制作标本，因此，从实验托盘中取出石模型比从传统托盘中取出更容易。常规托盘组有3个试件发生断裂，而实验托盘组则无试件断裂。从以上事实来看，形状记忆托盘对于临床使用似乎是有用的。较少的