The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of marginal and internal gaps in single and three-unit metal frameworks made by micro-stereolithography

  • Kim, Dong-Yeon (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Lee, Ha-Na (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Ji-Hwan (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Hae-Young (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Woong-Chul (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University)
  • Received : 2016.08.15
  • Accepted : 2016.12.20
  • Published : 2017.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

PURPOSE. The purpose of this study is to compare single and three-unit metal frameworks that are produced by micro-stereolithography. MATERIALS AND METHODS. Silicone impressions of a selected molar and a premolar were used to make master abutments that were scanned into a stereolithography file. The file was processed with computer aided design software to create single and three-unit designs from which resin frameworks were created using micro-stereolithography. These resin frameworks were subjected to investment, burnout, and casting to fabricate single and three-unit metal ones that were measured under a digital microscope by using the silicone replica technique. The measurements were verified by means of the Mann-Whitney U test (${\alpha}=.05$). RESULTS. The marginal gap was $101.9{\pm}53.4{\mu}m$ for SM group and $104.3{\pm}62.9{\mu}m$ for TUM group. The measurement of non-pontics in a single metal framework was $93.6{\pm}43.9{\mu}m$, and that of non-pontics in a three-unit metal framework was $64.9{\pm}46.5{\mu}m$. The dimension of pontics in a single metal framework was $110.2{\pm}61.4{\mu}m$, and that of pontics in a three-unit metal framework was $143.7{\pm}51.8{\mu}m$. CONCLUSION. The marginal gap was smaller for the single metal framework than for the three-unit one, which requires further improvement before it can be used for clinical purposes.

Keywords

References

  1. Al Jabbari YS, Koutsoukis T, Barmpagadaki X, Zinelis S. Metallurgical and interfacial characterization of PFM Co-Cr dental alloys fabricated via casting, milling or selective laser melting. Dent Mater 2014;30:e79-88.
  2. Kim KB, Kim WC, Kim HY, Kim JH. An evaluation of marginal fit of three-unit fixed dental prostheses fabricated by direct metal laser sintering system. Dent Mater 2013;29:e91-6.
  3. Quante K, Ludwig K, Kern M. Marginal and internal fit of metal-ceramic crowns fabricated with a new laser melting technology. Dent Mater 2008;24:1311-5. https://doi.org/10.1016/j.dental.2008.02.011
  4. Galindo DF, Ercoli C, Graser GN, Tallents RH, Moss ME. Effect of soldering on metal-porcelain bond strength in repaired porcelain-fused-to-metal castings. J Prosthet Dent 2001;85:88-94. https://doi.org/10.1067/mpr.2001.112429
  5. Zhao H, Hu X, Bush MB, Lawn BR. Cracking of porcelain coatings bonded to metal substrates of different modulus and hardness. J Mater Res 2001;16:1471-8. https://doi.org/10.1557/JMR.2001.0205
  6. Kokubo Y, Ohkubo C, Tsumita M, Miyashita A, Vult von Steyern P, Fukushima S. Clinical marginal and internal gaps of Procera AllCeram crowns. J Oral Rehabil 2005;32:526-30. https://doi.org/10.1111/j.1365-2842.2005.01458.x
  7. McLean JW, von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J 1971;131:107-11. https://doi.org/10.1038/sj.bdj.4802708
  8. Ng J, Ruse D, Wyatt C. A comparison of the marginal fit of crowns fabricated with digital and conventional methods. J Prosthet Dent 2014;112:555-60. https://doi.org/10.1016/j.prosdent.2013.12.002
  9. Ortorp A, Jonsson D, Mouhsen A, Vult von Steyern P. The fit of cobalt-chromium three-unit fixed dental prostheses fabricated with four different techniques: a comparative in vitro study. Dent Mater 2011;27:356-63. https://doi.org/10.1016/j.dental.2010.11.015
  10. Park JY, Kim HY, Kim JH, Kim JH, Kim WC. Comparison of prosthetic models produced by traditional and additive manufacturing methods. J Adv Prosthodont 2015;7:294-302. https://doi.org/10.4047/jap.2015.7.4.294
  11. Ucar Y, Akova T, Akyil MS, Brantley WA. Internal fit evaluation of crowns prepared using a new dental crown fabrication technique: laser-sintered Co-Cr crowns. J Prosthet Dent 2009;102:253-9. https://doi.org/10.1016/S0022-3913(09)60165-7
  12. van Noort R. The future of dental devices is digital. Dent Mater 2012;28:3-12. https://doi.org/10.1016/j.dental.2011.10.014
  13. Kocaagaoglu H, Kilinc HI, Albayrak H, Kara M. In vitro evaluation of marginal, axial, and occlusal discrepancies in metal ceramic restorations produced with new technologies. J Prosthet Dent 2016;116:368-74. https://doi.org/10.1016/j.prosdent.2016.03.013
  14. Kim CM, Kim SR, Kim JH, Kim HY, Kim WC. Trueness of milled prostheses according to number of ball-end mill burs. J Prosthet Dent 2016;115:624-9. https://doi.org/10.1016/j.prosdent.2015.10.014
  15. Grant GT. Direct digital manufacturing. Clinical applications of digital dental technology hoboken. NJ; Wiley-Blackwell; 2015. p. 41-57.
  16. Berger U. Aspects of accuracy and precision in the additive manufacturing of plastic gears. Virtual Phys Prototyp 2015;10:49-57. https://doi.org/10.1080/17452759.2015.1026127
  17. Leigh SJ, Purssell C, Bowen J, Hutchins DA, Covington JA, Billson DR. A miniature flow sensor fabricated by micro-stereolithography employing a magnetite/acrylic nanocomposite resin. Sens Actuators A: Physical 2011;168:66-71. https://doi.org/10.1016/j.sna.2011.03.058
  18. Schuster M, Turecek C, Stampfl J, Varga F, Liska R. Biofunctional photopolymers for Micro-Stereolithography. Proceedings of the 8th International Symposium on Laser Precision Microfabrication; 2007. p. 1-5.
  19. Sayed NM. Shear bond strength and failure mode between veneering ceramic and metal cores after multiple firing cycles. Egyptian Dent J 2015;61:659-66.
  20. Soliman MSM, Mohsen CA, El-Mahallawi O, Abu-Eittah MRH. Effect of different cement spaces on the vertical marginal gap of full anatomical zirconia bridges. J Am Sci 2015;11:145-52.
  21. Dental Materials Research, 50th Anniversary symposium, National bureau of standards special publication No. 354, Oct., 6 to 8, 1969, Gaithersburg; 1972. p. 61-6.
  22. Kul E, Aladag LI, Duymus ZY. Comparison of the metal-ceramic bond after recasting and after laser sintering. J Prosthet Dent 2015;114:109-13. https://doi.org/10.1016/j.prosdent.2015.01.016
  23. Molin M, Karlsson S. The fit of gold inlays and three ceramic inlay systems. A clinical and in vitro study. Acta Odontol Scand 1993;51:201-6. https://doi.org/10.3109/00016359309040568

Cited by

  1. Trueness and precision of scanning abutment impressions and stone models according to dental CAD/CAM evaluation standards vol.10, pp.5, 2018, https://doi.org/10.4047/jap.2018.10.5.335
  2. Accuracy of provisional crowns made using stereolithography apparatus and subtractive technique vol.10, pp.5, 2018, https://doi.org/10.4047/jap.2018.10.5.354