Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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A comparison of surface hardness and microstructural characteristics between a type IV stone with and without die hardening treatment, and a polyurethane resin die material

IV형 경석고와 경화처리된 IV형 경석고 그리고 폴리우레탄 수지 치형재의 표면경도와 미세구조 특성의 비교

  • Lee, Wan-Sun (Department of Health Science Specialized in Dental Lab. Science & Engineering, Graduate School, Korea University) ;
  • Kim, Ji-Hwan (Department of Health Science Specialized in Dental Lab. Science & Engineering, Graduate School, Korea University) ;
  • Kim, Tae-Suk (Department of Dental Laboratory Technology, Masan university) ;
  • Kim, Nam-Sic (Department of Dental Laboratory Technology, Masan university) ;
  • Yu, Chin-Ho (Department of Dental Laboratory Technology, Masan university)
  • 이완선 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김지환 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김태석 (마산대학교 치기공과) ;
  • 김남식 (마산대학교 치기공과) ;
  • 유진호 (마산대학교 치기공과)
  • Received : 2012.07.19
  • Accepted : 2012.09.21
  • Published : 2012.09.30
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Abstract

Purpose: This study compared the surface hardness (Vickers) and microstructural characteristics between a type IV stone with and without die hardening treatment, a polyurethane die material. Methods: Materials used were a type IV stone(MG Crystal Rock), two die hardeners (Hardening bath, Epox-it), and a polyurethane resin material(Polyluck). Six specimens per group were prepared according to manufacturer's directions. The prepared specimens were tested by means of hardness test, one-way ANOVA analysis, scanning electron microscopic(SEM) observations and energy dispersive spectroscopic(EDS) analysis. Results: In the hardness test and its statistical analysis, there was no significant difference in the surface hardness between a type IV stone and type IV stone with die hardener coating, type IV stone mixed with an epoxy like material instead of water. In contrast, polyurethane resin material exhibited significantly greater surface hardness than other specimen groups (p<0.05). Conclusion: By considering the results of the hardness test, SEM observations and EDS analysis, although the die hardeners on type IV stone did not show remarkable improvement in surface hardness, the die hardener coating on the surface of type IV stone material did show decrease of microporous and improvement of surface defects.

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References

  1. Anusavice KJ. Phillips' science of dental materials. 11th ed. PA: Sounders; 139-140, 400-406, 568, 572-576, 578, 2003.
  2. Brown TL, LeMay HE, Bursten BE. Chemistry: The central science. 10th ed. Korean language ed. Pearson Education Korea Ltd: Nokmoondang; 918-928, 1002-1004, 2007.
  3. Derrien G, Sturtz G. Comparison of transverse strength and dimensional variations between die stone, die epoxy resin, and die polyurethane resin. J Prosthet Dent. 74: 569-574, 1995. https://doi.org/10.1016/S0022-3913(05)80307-5
  4. Duke P, Moore BK, Haug SP, Andres CJ. Study of the physical properties of type IV gypsum, resin-containing, and epoxy die materials. J Prosthet Dent. 83: 466-473, 2000. https://doi.org/10.1016/S0022-3913(00)70043-6
  5. Fan PL, Powers JM, Reid BC. Surface mechanical properties of stone, resin, and metal dies. J Am Dent Assoc. 103: 408-411, 1981. https://doi.org/10.14219/jada.archive.1981.0354
  6. Harris PE, Hoyer S, Lindquist TJ, Stanford CM. Alterations of surface hardness with gypsum die hardeners. J Prosthet Dent. 92: 35-38, 2004. https://doi.org/10.1016/j.prosdent.2004.04.002
  7. He LH, Vuuren LJ, Planitz N, Swain MV. A micromechanical evaluation of the effects of die hardener on die stone. Dent Mater J. 29(4):433-437, 2010. https://doi.org/10.4012/dmj.2009-094
  8. Kim YR, Park JM, Song KY. The influence of the die hardener on gypsum die, J Korean Acad Prosthodont 45(4): 546-554, 2007.
  9. Lindquist TJ, Stanford CM, Mostafavi H, Xie XJ. Abrasion resistance of a resin-impregnated type IV gypsum in comparison to conventional products. J Prosthet Dent. 87:319-322, 2002. https://doi.org/10.1067/mpr.2002.122015
  10. Lindquist TJ, Stanford CM, Knox E. Influence of surface hardener on gypsum abrasion resistance and water sorption, J Prosthet Dent. 90: 441-446, 2003. https://doi.org/10.1016/S0022-3913(03)00544-4
  11. Sakaguchi RL, Powers JM. Craig's, Restorative dental materials. 13th ed. PA: Elsevier Inc; 299-308, 2012.
  12. Isocyanate-Wikipedia, http://en.wikipedia.org/wiki/Isocyanate, 2012.