無托槽隱形正畸系統(tǒng)的精度及力學性能研究
發(fā)布時間：2018-12-26 18:41
【摘要】：無托槽隱形正畸作為一項健康、美觀的齒科正畸新技術,正逐漸被患者及醫(yī)生所接受。無托槽正畸系統(tǒng)過程中涉及了多種材料的使用,包括印模材料、石膏材料和膜片材料。對于這三種材料有不同的主要性能要求,本實驗運用3D掃描儀、數(shù)顯顯微鏡、應變儀等多種技術手段,對上述三種材料的主要需求性能進行了測定,結果顯示： 3shapeD700掃描儀的平均準確度符合官方申明的精度范圍(△0.02),3shapeD700和口內(nèi)掃描儀的準確度和精密度無顯著差異。 長達3周的尺寸測量顯示,制取印模后短時間的戊二醛浸泡消毒對硅橡膠印模的尺寸穩(wěn)定性無顯著性影響,但可能一定程度改變了尺寸的變化趨勢。 關于放置條件對藻酸鹽印模短時間尺寸變化的影響的研究顯示,藻酸鹽印模暴露于空氣中超過15min會導致精度快速下降,存放時間超過15min時應當將印模浸泡在水中。 對石膏的長期尺寸變化規(guī)律的測量顯示,石膏模型在剛灌制好至1小時內(nèi)是快速膨脹期,也是石膏模之間膨脹速率差異最大的時期,整體來看,石膏達到最大體積的時間在1小時至1天之間。 三種不同預處理方法對0.8mmErkodur膜片在1%應變條件下的應力松弛性能的影響實驗表明,熱循環(huán)10次顯著加快了膜片的松弛速度,但熱循環(huán)20次組的應力松弛速度相比于10次組較慢,這與膜片的微觀結構的改變有關。冷藏15天組的應力松弛速度相比控制組有微小的減慢,這可能與濕度的改變有關。
[Abstract]:As a healthy and beautiful orthodontic technique, invisible orthodontics without brackets is gradually accepted by patients and doctors. The use of many materials, including impression materials, gypsum materials and diaphragm materials, is involved in the orthodontic system without brackets. These three kinds of materials have different main performance requirements. In this experiment, the main requirements of these three kinds of materials are measured by using 3D scanner, digital display microscope, strain gauge and so on. The results showed that the average accuracy of 3shapeD700 scanner was in accordance with the official range of accuracy (0.02). There was no significant difference in accuracy and precision between 3shapeD700 and in-mouth scanner. The size measurement for 3 weeks showed that there was no significant effect on the dimensional stability of silicone rubber impression after a short period of glutaraldehyde soaking and disinfection, but the change trend of size may be changed to some extent. The study on the effect of placing conditions on the short time size change of alginate impression shows that when the alginate impression is exposed to air over 15min, the precision will decrease rapidly. When the storage time is longer than 15min, the impression should be immersed in water. The measurement of the long-term size change of gypsum shows that the gypsum model is a period of rapid expansion within 1 hour after just being irrigated, and it is also the period in which the difference of expansion rate between gypsum molds is greatest. The maximum volume of gypsum is between 1 hour and 1 day. The effect of three different pretreatment methods on the stress relaxation properties of 0.8mmErkodur films under 1% strain shows that the relaxation rate of the membranes is significantly accelerated by thermal cycling for 10 times. However, the stress relaxation rate of the 20 times heat cycling group is slower than that of the 10 times group, which is related to the change of the microstructure of the diaphragm. The stress relaxation rate of the 15 day cold storage group was slightly slower than that of the control group, which may be related to the change of humidity.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：R783.5
本文編號：2392529
[Abstract]:As a healthy and beautiful orthodontic technique, invisible orthodontics without brackets is gradually accepted by patients and doctors. The use of many materials, including impression materials, gypsum materials and diaphragm materials, is involved in the orthodontic system without brackets. These three kinds of materials have different main performance requirements. In this experiment, the main requirements of these three kinds of materials are measured by using 3D scanner, digital display microscope, strain gauge and so on. The results showed that the average accuracy of 3shapeD700 scanner was in accordance with the official range of accuracy (0.02). There was no significant difference in accuracy and precision between 3shapeD700 and in-mouth scanner. The size measurement for 3 weeks showed that there was no significant effect on the dimensional stability of silicone rubber impression after a short period of glutaraldehyde soaking and disinfection, but the change trend of size may be changed to some extent. The study on the effect of placing conditions on the short time size change of alginate impression shows that when the alginate impression is exposed to air over 15min, the precision will decrease rapidly. When the storage time is longer than 15min, the impression should be immersed in water. The measurement of the long-term size change of gypsum shows that the gypsum model is a period of rapid expansion within 1 hour after just being irrigated, and it is also the period in which the difference of expansion rate between gypsum molds is greatest. The maximum volume of gypsum is between 1 hour and 1 day. The effect of three different pretreatment methods on the stress relaxation properties of 0.8mmErkodur films under 1% strain shows that the relaxation rate of the membranes is significantly accelerated by thermal cycling for 10 times. However, the stress relaxation rate of the 20 times heat cycling group is slower than that of the 10 times group, which is related to the change of the microstructure of the diaphragm. The stress relaxation rate of the 15 day cold storage group was slightly slower than that of the control group, which may be related to the change of humidity.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：R783.5
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，本文編號：2392529
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