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CONFUTER-AIDED CASTING DESIGN FOR IMPLANT TITANIUM SUPERSTRUCTURES  

Oh Se-Wook (Department of Prosthodontics, College of Dentistry, Yonsei University)
Lee Ho-Yong (Department of Prosthodontics, College of Dentistry, Yonsei University)
Lee Keun-Woo (Department of Prosthodontics, College of Dentistry, Yonsei University)
Shim Jun-Sung (Department of Prosthodontics, College of Dentistry, Yonsei University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.41, no.4, 2003 , pp. 421-439 More about this Journal
Abstract
Statement of problem : It is difficult to obtain a good titanium casting body using the traditional sprue design because of high melting point of Ti, and the low fluidity and high reactivity of molten Ti. Purpose : A new sprue design for titanium casting bodies needs more trial and error. In order to decrease the number of trial and error, computer simulation(MAGMASOFT, Magmasoft Giessereitechnologie GmbH, Achen, Germany) was used to optimize sprue design in U-shaped implant superstructures. Material and method : Five kinds of sprue were examined for the design of the sprue former for titanium casting: Sprue design A(sprue length 4 mm, rectangular shape, 4 sprues), Sprue design B(sprue length 4 mm. round shape. radius 2 mm, 7 sprues), Sprue design C (sprue length 2 mm, round shape, radius 2 mm, 7 sprues). Sprue design D (sprue length 2 mm, cone shape, large radius 3mm. small radius 2mm, 7 sprues), and Sprue design E( sprue length 2 mm. one unit channel shape). Sprue design F(sprue length 2mm, one unit channel shape) was also examined for the design of the customized sprue former in the Biotan system(Schutz Dental Gmbh, Germany). The casting bodies were taken in Sprue design A, Sprue design D, Sprue design E, and Sprue design F in the Biotan casting system. The numerically predicted defects were compared with the experimental dental castings by the radiographic and sectional view observations. Results : 1. According to the result of computer simulation, turbulence during mold filling was decreased in the sequence of Sprue design F, Sprue design E, Sprue design D, Sprue design C, Sprue design B, and Sprue design A. 2. The calculated solidification time contours indicate that hot spot was moved from the casting body to the sprue button in the sequence of Sprue design A, Sprue design B, Sprue design C, Sprue design D, and Sprue design E. The filling pattern of Sprue design F was similar to that of Sprue design E. 3 The predicted filling pattern shows that less turbulence was found in the customized sprue former than in the standard sprue former. 4. According to the results of the radiographic and cross sectional observations, casting defects less than 1mm were found at the center of a casting body with Sprue design E and Sprue design F. However, larger casting defects of 4mm were found in a casting with Sprue design A. 5. The predicted casting porosity was similar to that of the real casting. Conclusion : One unit channel-type and customized sprue former can be recommended. Further research and developement of various sprue designs using computer simulation in necessary to optimize casting design, in order to reduce the formation of casting defects in implant titanuim super-structures.
Keywords
Computer simulation; Casting defect; Titanium; Mold filling; Solidification; Sprue design;
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  • Reference
1 Smickley RJ, Bednarz LP. Titanium Alloys in Surgical Implants. ASTM STP 1983;796:76
2 Russell RW, Yiming L. In vitro evaluation of biocompatibility of experimental titanium alloys for dental restorations. J Prosthet Dent 1998;80:495-500   DOI   ScienceOn
3 Foti B, Tavitian P. Tosello A. Bonfil JJ, Franquin JC. Polymetallism and osseointergration in oral implantology. J Oral Rehabilitation 1999;26(6):495   DOI
4 Wataha JC, Malcolm CT. Effect of alloy surface composition on release of elements from dental casting alloys. J Oral Rehabilitation. 1996;23:583-589   DOI   ScienceOn
5 Spiros Z. Effect of pressure of helium. argon, krypton, and xenon on the porosity, microstructure and mechanical properties of commercially pure titanium castings. J Prosthet Dent 2000;84:575-582   DOI   ScienceOn
6 Kohler C. Richter G. The Sprue behavior of nonprecious metals. Zahn Mund Keiferheilkd Zentralbl 1989;77(2):145-152
7 Bernett CA. Maguire H. Sprue design in removable partial denture casting. J Dent 1996;24:99-103   DOI   ScienceOn
8 Chai TI. Stein RS. Porosity and accuracy of multi-unit titanium castings. J Prosthet Dent 1995;73:534-541   DOI   ScienceOn
9 Toru O, Chikahiro O, Ikuya W, Osamu O, Yukyo T. The present status of dental titanum casting. J Minerals. metals & Materials 1998;50(9):24
10 Lee JN. Diecasting process (1). Jumulgisul. Foundry Technology. 1979:3(2) :45-63
11 Jang CH. Casting plan of Aluminum die castings. J Korean Foundrymen's Society 1994:14(8):294-304
12 Kim KY. Die casting die designing(I)- Design of gate system-. J Korean Foundrymen's Society 1999;19(2):178-188
13 Smith WE, Wallace JF. Gating of die casting. AFS 1965
14 Hong CP. Technical Reviews : State of the art of computer simulation based casting tehnology. J Korean Foundrymen's Society. 1995;15(1):5-13
15 Kiyoshi T. Seijiro M, Satoyuki K, Yuki Y, Hiroshi K, Yoshio K. Efficacy of gas purging for titanium casting. Dent Mat J 1994;13(2) :206-213   DOI   ScienceOn
16 Lautenschlager EP, Monaghan P. Titanium and titanium alloy as dental materials. Int Dent J 1993;43(3):245-53   PUBMED
17 Lemons JE. Lucas LC, Johansson BI. Intraoral corrosion resulting from coupling dental implants and restorative metallic systems. Implant Dent 1992;1(2)107-112
18 Bumgardener JD. Johansson BI. Effects of titanium-dental restorative alloy galvanic couples on cultured cells. J Biomed Mater Res 1998;43(2)184-91
19 Davis KG. Magny JG. Trapping slag and solid nonmetallic materials in gating system. Tech. report PM-M-73-5-. CANMET. Eergy, Mines and resources Canada, 1973
20 Kim KY. Die casting die designing (II)-Design of overflow and gas vent- J Korean Foundrymen's Society 1999;19(3):277-283
21 Engler S, Boenisch D, Kohler D. Metal and mold wall movement during solidification of cast iron. AFS Cast Metals Research Journal 1973;3:20-30
22 Hero H, Syverud M, Waarli M. Mold filling and porosity in castings of titanium. Dental Materials 1993;9:15   DOI   ScienceOn
23 Johnson A. The effect of sprue design and alloy type on the fit of three-unit metal/ceramic bridges. Eur J Prosthodont Restor Dent 1995;3(6):241-245   PUBMED
24 Wataha JC. Biocompatibility of dental casting alloys : a review. J Prosthet Dent 2000;83:223-234   DOI   ScienceOn
25 Suzuki K, Nishikawa K, Watakabe S. Mold filling and solidification during centrifugal precision casting of Ti-6al-4v alloys. Materials Transactions. 1970;37:1793-1801
26 Iwata Y, Tozawa K, Yamamoto Y. Filling velocities and defects of plate shaped die castings. J Japan Inst Light Metals. 1987;37:48
27 David CS. Eliminating modeling 'trial & error' with casting process optimization. Modern Casting 2001;91(8):37-42
28 Verrett RG, Duke ES. The effect of sprue attachment design on castabiJity and porosity. J Prosthet Dent 1989;61:418-424   DOI   ScienceOn
29 Okabe T, Okubo C, Watanabe I, Okuno O, Takada Y. The present status of dental titanium casting. JOM 1998;50(9);24-38
30 Wang RR, Fenton A. Titanium for prosthodontic applications: a review of the literature. 1996;27(6):401-8
31 Niyama E. Calculation of solidification rate of shape casting by the flux-boundary method. IMONO. 1977;49(10):608-613
32 Sarjant RJ. Slack MR. J. Iron Steel Int., 1954;177:428
33 Ohsasa K, Takahashi T. Radial contraction behavior of solidifying shell for cylindrical Al-3%Si alloy ingot. J Japan Inst Metals 1988;52(2):1012-1019   DOI
34 Siauw TH. Davis AJ. Flow analysis in tapered runners. Tech. report paper No. G-T79-054. Transaction SDCE. 1979
35 Kuroiwa A. Titanium technology. Quintessence of dental technology 2001 ;4(7):30-42
36 English C. An overview of implant hardware. J Am Dent Assoc 1990;121:582
37 Wu M, Augthun M, Schadlich-Stubenrauch J, Augthun M, Sahm PR, Spiekermann H. Computer aided prediction and control of shrinkage porosity in titanium dental castings. Dent Mater 1998;14:1998
38 Suzuki KI. Nnishikawa K. Watakabe S. Mold filling and solidification during centrifugal precision casting of Ti-6Al-4V alloys. Materials Transactions JIM 1996;37:1793-1801
39 Syverud M.Hero H. Mold filling of titanium castings using investments with different gas permeability. Dent Mat 1995;11:14-18   DOI   ScienceOn
40 Jang KS. Youn SJ. Kim YS. Comparison of castability and surface roughness of commercially pure titanium and cobaltchromium denture frameworks. 2001;86(7) :93-98
41 Comini G, Del Guidice S. Int. J. Numer. Methods Eng. 1974;8:612
42 James JS. Stephen JA. Robert KF. George BP. A comparative study of the centrifugal and vacuum-pressure techniques of casting removable partial denture frameworks. J Prosthet Dent 1981;(45):18-23
43 Yoo SM. Lee DH. Kim JK. So CY. Hong CP. Three Dimensional Solidification Analysis in Large Steel Castings by Modified Finite Difference Method. J Korean Foundrymen's Society. 1991;11(1):54-62
44 Ricardo AZ, Guilherm EP. Itamar F. Joao MD. Corrosion-fatigue life of commercially pure titanium and Ti-6Al-4V alloys in different storage environments. J Prosthet Dent 2000;84:274-279   DOI   ScienceOn
45 Chan D, Guillory V, Blackman R, Chung KH. The effects of sprue design on the roughness and porosity of titanium castings. J Prosthet Dent 1997;78(4):400-404   DOI   ScienceOn
46 Bumgardner .JD. Johansson BI. Galvanic corrosion and cytotoxic effects of amalgam and gallium alloys coupled to titanium. Eur J Oral Sci 1996;104(3) :300-308   DOI   ScienceOn
47 Wataha JC, Malcolm CT. Effect of alloy surface composition on release of elements from dental casting alloys. J Oral Rehabilitation. 1996;23:583-589   DOI   ScienceOn
48 Magnitskiy ON. Casting properties of titanium alloys. Federal Scientific and technical information springfield Va 22151:5-6
49 Lee YC, Lee SM, Choi JK, Hong CP. Development and application of an automated water cooling system in the cyclic permanent mold casing process I: Modeling of mold filling and solidification sequences. J Korean Foundrymen's Society. 1998;18(2):179-189
50 Lee YT, Kim SE, Hyun YT, Jung HW. The new dream material : Titanium. The Korea Metal Journal. 2001
51 Goran S. Gaynour S, Jon ED. Cytotoxicity of dental alloys, metals and ceramics assessed by Millipore filter. agar overlay and MTT tests. J Prosthet Dent 2000; 84:229-236   DOI   ScienceOn
52 Geis-Gerstorfer J. Weber H, Sauer KH. In vitro substance loss due to galvanic corrosion in Ti implant/Ni-Cr supraconstruction systems. Int J Oral Maxilofacial Implants 1989;4(2):119-123
53 Watanabe I, Watkins JH. Nakajima H, Atsuta M, Okabe T. Effect of pressure difference on the quality of titanium casting. J Dental Research 1997:76(3):773-779
54 Kim SB. Hong CP. Technical review : Heat and fluid analyses and it's application to the design of the casting process. J Korean Foundrymen's Society. 1993;13(2)131-145
55 Takashi O, Yuzuru S, Takeshi B, Yohichi U. Quality of cast pure titanium denture base as a prosthetic appliance. Quintessence of Dental Technology. 1988;13:187-190
56 Cecconi BT. Koppen RG. Pheonix RD. Ceconni ML. Casting titanium partial denture frameworks : A radiographic evaluation. J Prosthet Dent 2002;87(3) :277-80   DOI   ScienceOn
57 David CS. Optimizing casting simulation. Foundary Management & Technology 2001;129(12):34-38
58 Nobuyuki I. Atsuko T. Harutoshi D. The recent development in implantlogy. superstructure using pure titanium. Quintessence of Dental Technology. 1988;13:217-222
59 al-Mesmar HS. Morgano SM. Mark LE. Investigation of the effect of three sprue design on the porosity and the completeness of titanium cast removable partial denture frameworks. J Prosthet Dent 1999;82(1):15-21   DOI   ScienceOn
60 Hong C, Umeda T, Kimura Y. Boundary Elements Springer-Verlag, Berlin. 1983;153
61 Reclaru L, Meyer JM. Study of corrosion between a titanium implant and dental alloys. J Dent 1994;22:159-168   DOI   ScienceOn
62 Campbel J. Castings. Butterworth Heinemann, Oxford. 1991;30-73
63 Richter W, Lubberich AC. The titanium superstructure on the intraosseous implant. Quintessence of Dental Technology. 1991;16:1421-1429