牙科氧化鋯瓷冠贋復元件之三維列印研究

The Study of Dental Zirconia Crown Prosthesis Elements Manufactured by Three-dimensional Printing Technology

羅鉦勲(Cheng-Hsun Lo)

指導教授 ： 張信良

國立虎尾科技大學/工程學院/動力機械工程系機械與機電工程碩士班/碩士(2016年)

摘要

傳統的假牙通常需要由石膏模製成，這方法費時且容易使患者感到不適。牙膏模由病患口腔取出後，還需進行翻模和燒結，並以CNC進行加工以配合患者牙齒。然而，假牙裝配至患者口腔中並不容易確認是否合適，如果假牙不合適很快需再次取出，原因是細菌容易孳生在縫隙中，造成二次蛀牙和口臭。綜觀上述傳統的方式不僅費時、花費高，且容易造成患者不適和醫療問題。而3D列印將是人們對假牙製造的另一種選擇，但3D列印製造的最大問題就是收縮量極大。本研究利用CAE分析和實驗設計以應用至不同形狀的假牙收縮預測，接著再反算需放大多少倍率，這項技術將能製造更接近病患所需的精準假牙，也能避免CNC機械的複雜加工程序和減少牙醫後處裡的時間。同時，假牙底部的收縮率要能確實的貼合牙齒亦是重要的課題。如果密合度不夠確實，則細菌容易滋生並產生二次蛀牙，而使牙齒需全部被拔除。在本研究中，收縮率將透過3D列印和燒結後之假牙橫截面進行量測和比較，並將假牙裝置於標準牙模上，本研究的成果將能提供3D列印之假牙外型能更貼近牙模型狀。

關鍵字

3D列印 ； 牙齒 ； CAE分析 ； 收縮率 ； 迴歸分析

並列摘要

The traditional dental prostheses’ components often need to be molded by the plaster and make the patients uncomfortable. After the mold is taken from the patient’s mouth, it then be used as the coarse mold for further casting and sintering. The shape is then modified by CNC machining to fit in the patient’s mouth. However, it is difficult to confirm the adaptation of dental prostheses components installed in patient’s mouth. If the adaptation of tooth is not suitable, the dental prostheses components will be taken out soon. The reason is that the teeth will be decayed again in the near future and cause bad breath. The traditional steps are not only time-consuming, high cost, but also easily cause patient’s discomfort and medical problems. The 3D printing method to manufacture the human teeth is another good choose. CAE analysis and experimental design are investigated here to predict the shrinkages of different dentures shapes. Then the dentures shapes are reversed amplified. It will be close to patient requirement with precise dentures shape and avoid complicated procedure of CNC machining. However, the shrinkage at the bottom of denture is most important to fit the tooth properly. If the fit isn’t close enough, the bacterial will get into aperture easily to make the teeth being decayed again. It will make the teeth to be removed completely. In the thesis, the cross section of the denture is measured and compared through the 3D printing and sintered to study the fit on the standard mold. The shrinkage rates are then obtained along different directions. The results can be applied to amplify the model of denture for the 3D printing to make the denture closlye to the mold.

並列關鍵字

3D Printing ； Tooth ； CAE Analysis ； Shrinkage rate ； Regression Analysis

參考文獻

[6] G. Mitteramskogler, R. Gmeiner, R. Felzmann, S. Gruber, C. Hofstetter, J. Stampf, J. Ebert, W. Wachter, and J. Laubersheimer, “Light curing strategies for lithography-based additive manufacturing of customized ceramics” Additive Manufacturing, Vol. 1-4, pp. 110-118, October 2014.

[7] M. Martorelli, S. Gerbino, M. Giudice, and P. Ausiello, “A comparison between customized clear and removable orthodontic appliances manufactured using RP and CNC techniques.” Dental Materials, Vol. 29, pp. e1-e10, February 2013.

[8] T. V. Flügge, K. Nelson, R. Schmelzeisen, and M. C. Metzger, “Three-dimensional plotting and printing of an implant drilling guide: Simplifying Guided Implant Surgery” Journal of Oral and Maxillofacial Surgery, Vol. 71, pp. 1340-1346, August 2013.

[9] A. Cohen, A. Laviv, P. Berman, R. Nashef, and A. T. Jawad, “Mandibular reconstruction using stereolithographic 3-dimensional printing modeling technology” Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, Vol. 108, pp.661-666, November 2009.

[10] K. U. Chang, “Product manufacturing and cost estimating using CAD/CAE; Chapter 5–Rapid Prototyping”, pp. 191-235, 2013.