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논문 상세정보

Abstract

Statement of problem. Titanium-Nickel alloy might be used in various prosthetic restorations since it has a unique property such as super-elasticity and high fatigue resistance. However, little is known about the casting ability of this alloy. Purpose. This in vitro study compared the casting accuracy and the porosity made with different investments and various sprue designs to ascertain what casting condition would be better for the fabrication of Ti-Ni cast restorations. Material and methods. A total of 70 Ti-Ni alloy crowns were made and divided into 7 groups of 10 copings on a metal master die. For measuring the effect of the sprue numbers, two groups with one and two 8-gauge sprues were compared. Moreover, the results of the conventional sprue and the double thickness sprues were compared. Three investments were used; carbon free phosphate bonded investment, titanium investment and gypsum bonded investment. The cast restorations were evaluated at 48 points on the entire circumferential margin with a stereomicroscope measuring in micrometers. Each crown was radiographically examined for casting defects and porosity. Data on casting accuracy were analyzed using two-way and Post hoc Scheffe's comparison to determine whether significant differences existed at the 95% confidence level. Student-Newman-Keuls test were performed to identify significant differences in the number of voids. Results. The double sprueing group and double thickness group had significantly less marginal discrepancy than the single sprueing group (P<.05 and P<.01, respectively). The castings with phosphate bonded investment showed the least marginal discrepancy and the smoothest surface. The castings invested in the gypsum bonded investment had the greatest gaps in margin and the largest failure rate. The double sprueing group and phosphate bonded investment group had significantly smaller void numbers and smaller void size than the other groups. Conclusion. Within the limitations of this in vitro study, the casting accuracy of the groups using thicker, double sprue design and the phosphate bonded investment was significantly superior. Moreover, void number and size were less than other groups.

참고문헌 (25)

  1. JK Park, CM Jeong, YC Jeon The effect of sprue design on the marginal reproducibility of cast titanium crowns. J Korean Acad Prosthodont 2002;40:352-63 
  2. Takahashi J, Kimura H, Lautenschlager EP, Chern Lin JH, Moser JB, Greener EH. Casting pure titanium into commercial phosphate-bonded SiO2 investment molds. J Dent Res. 1990;69:1800-5 
  3. Watanabe K, Hamanaka H, Doi H, Miura I. Dental casting of Ni-Ti alloys. Part I. Mechanical properties and microstructure. J Dent Mater 1983;2:515-24 
  4. Inoue T, Inoue A, Asai M, Komasa Y. Fit and dimensional changes of cast CP titanium crowns fabricated using sintered molds. Dent Mater J. 2001;20:195-205 
  5. Hruska AR, Borelli P. Quality criteria for pure titanium casting, laboratory soldering, intraoral welding, and a device to aid in making uncontaminated castings. J Prosthet Dent. 1991;66:561-5 
  6. Takahashi M, Kikuchi M, Takada Y, Okuno O. Mechanical properties and microstructures of dental cast Ti-Ag and Ti-Cu alloys. Dent Mater J. 2002;21:270-80 
  7. Luo XP, Guo TW, Ou YG, Liu Q. Titanium casting into phosphate bonded investment with zirconite. Dent Mater. 2002;18:512-5 
  8. Groten M, Axmann D, Probster L, Weber H. Determination of the minimum number of marginal gap measurements required for practical in-vitro testing. J Prosthet Dent. 2000;83:40-9 
  9. Ryge G, Kozak K, Fairhurst CW. Porosities in dental gold casting. J Am Dent Assoc 1957;54:746-54 
  10. Al-Mesrnar HS, Morgano SM, Mark LE. Investigation of the effect of three sprue design on the porosity and the completeness of titanium cast RPD framework. J Prosthet Dent 1999;82:15-21 
  11. Syverud M, Here H. Mold filling of Ti castings using investments with different gas permeability. Dent Mater. 1995;11:14-8 
  12. Hero H, Syverud M, Waarli M. Mold filling and porosity in castings of titanium. Dent Mater. 1993;9:15-8 
  13. Preston JD, Berger R. Some laboratory variables affecting ceramo-metal alloys. Dent Gin North Am 1977;21:717-28 
  14. Curry TS, Dowdy JE, Murry RC. Christensens Physics of Diagnostic Radiology. 4th ed. Pennsylvania: Lea & Febiger; 1990. p.70-87 
  15. Wang RR, Boyle AM. A simple method for inspection of porosity in titanium castings. J Prosthet Dent 1993;70:275-6 
  16. Chai TI, Stein RS. Porosity and accuracy of multiple unit titanium castings. J Prosthet Dent 1995;73:534-41 
  17. Chan D, Lachman R Kaiser D, Chung K. The effect of sprue design on the marginal accuracy of titanium castings. J Oral Rehabil 1998;25:424-9 
  18. Sunnerkrantz PA, Syverud M, Hero H. Effect of casting atmosphere on the quality of Ti-crowns. Scand J Dent Res. 1990;98:268-72 
  19. Blackman R, Barghi N, Tran C. Dimensional changes in casting titanium removable partial denture frameworks. J Prosthet Dent 1991;65:309-15 
  20. Mori T, Jean-Louis M, Yabugarni M, Togaya T. The effect of investment type on the fit of cast titanium crowns. Aust Dent J. 1994;39:348-52 
  21. Kotake M. Retention of superelastic Ti-Ni alloy cast clasps. J Dent Mater 1994;13:459-66 
  22. Castleman LS, Motzkin SM, Alicandri FP, Bonawit VL, Johns AA. Biocompatibility of nitinol alloy as an implant material. J Biomed Mater Res 1976;10:695-731 
  23. Speck KM, Fraker AC. Anodic polarization behavior of Ti-Ni and Ti-6Al-4V in simulated physiological solutions. J Dent Res 1980;59:1590-5 
  24. Strickland WD, Sturdevant CM, Hill NC. Porosity in the full cast crown. JAm Dent Assoc 1959;58:448 
  25. Zinellis S. 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) 

이 논문을 인용한 문헌 (1)

  1. Seo, Yoon-Jeong ; Oh, Gye-Jeong ; Lee, Hyo-Il ; Shin, Yoo-Jin ; Kim, Hong-Joo ; Park, Sang-Won 2013. "Effect of different pattern size and pattern shape on castability of commercially pure titanium" 대한치과보철학회지 = The journal of Korean academy of prosthodontics, 51(4): 261~268 

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