The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

EFFECT OF WATER CONTENT ON THE FLEXURAL STRENGTH DURING REFIRING IN DENIAL PORCELAIN

치과용 도재의 재소성 과정중 수분 함량이 강도에 미치는 영향

  • Park Hye-Yang (Dept. of Prosthodontics, Dental College, Yonsei University) ;
  • Shim June-Sung (Dept. of Prosthodontics, Dental College, Yonsei University) ;
  • Lee Keun-Woo (Dept. of Prosthodontics, Dental College, Yonsei University)
  • 박혜양 (연세대학교 치과대학 보철학교실) ;
  • 심준성 (연세대학교 치과대학 보철학교실) ;
  • 이근우 (연세대학교 치과대학 보철학교실)
  • Published : 2003.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

Statement of problem : Long-term exposure of dental porcelain to saliva during temporary cementation of a porcelain-fused to metal (PFM) restoration could affect mechanical strength of dental porcelain if the restoration is refired. Purpose : This work was performed to verify the effect of water on the mechanical strength in aged dental porcelain. Material and method : 63 specimens(Vintage Metalbond opaque and opal powder) were distributed to three experimental groups ; non-water immersed control, immersed and pedried, and immersed and non-predired groups. The changes in flexural strength and fracture toughness after specimen refiring related to Fourier Transform Infrared (FT-IR) spectroscopy. Results : 1. The FT-IR reflectances assigned to molecular bonds of $H_2O$ were noted as significantly different between the first-fired group and three refired groups and between two water-immersed groups and control group after refiring(p<0.05). They were also significantly different between predried group and non-predried group after refiring(p<0.05) 2. For opal specimens, FT-IR absorbances for hydrogen bond of $H_2O$ and silanols were significantly higher in non-predried group than in predreid group(p<0.05). 3 Predried opal group showed the highest mean flexural strength(p<0.05). Non-predried group indicated higher mean flexural strength than control group(p<0.05). 4. The mean fracture toughness for predired group was higher than non-predried group(p<0.05). 5. The difference of leucite crystal size is noted between control group and water-immersed, predried group in scanning electron microscopic study(${\times}10000$).

Keywords

References

  1. Darvell B.W.: Material Science for Dentistry. version 4. 1997. pp. 394-408 Dental Material Science Faculty of Dentistry University of Hong Kong
  2. Skinner E.W. and Phillips RW.: The Science of Dental Materials. 1967, pp 597-616 W.B. Saunders Co. Piladelphia
  3. Giodamo R.A: Dental ceramic restorative systems. Compendium 17(8): 779-794, 1996
  4. Thompson J.Y. and Anusavice K.J.: Effect of surface etching on the flexure strength and fracture toughness of Dicor${\circledR}$ disks containing controlled flaws. J. Dent. Res. 73(2) : 505-510, 1994
  5. Kelly J.R., Campbell S.D. and Bowen H.K: Fracture-surface analysis of dental ceramics. J. Prosthet. Dent. 62 : 536-541, 1989
  6. Ritter J.E. : Predicting lifetime of materials and material structures. Dent. Mater. 11 : 142-146, 1995
  7. Lawn B.R., Padture N.P. and Cai H. Guiberteay F.: Making ceramics 'Ductile'. Science 263(25): 1114-1116,1994
  8. White S.N., Li Z.C., Yu Z. and Kipnis V.: Relationship between static chemical and cyclic mechanical fatigue in a feldspathic porcelain. Dent. Mater. 13: 103-110. 1997
  9. Thompson J.Y., Anusavice KJ.. Naman A and Morris H.F.: Fracture surface characterization of clinically failed All-Ceramic crowns. J. Dent. Res. 73(2): 1824-1832. 1994
  10. Drummond J.L.. King T.J., Bapna M.S. and Koperski R.D.: Mechanical property evaluation of pressable restorative ceramics. Dent. Mater. 16: 226-233, 2000
  11. Kiyoko B.: Q & A Ceramo-metal Science by Kiyoko Ban. 1989. pp 34-35, 62-65, Ishiyaku Publishers Inc., Tokyo
  12. Steven P.J., Fredrickson E.J. and Gress M.L.: Implant Prosthodontics. 2000, pp. 38-40, Mosby, St Louis
  13. Yamamoto M.: MetalCeramics 1985, pp. 447-481 Quintessence Pulishing Co., Tokyo
  14. Griggs J .A.. Kishen A. and Le K.N.: Mechanism of strength increase for a hydrothermal porcelain. in press
  15. Griggs J.A. and Kishen A: Influence of hydrolyzation on mechanical properties of a hydrothermal glass. J. Dent. Res. 80: 641 Abstract 915, 2001
  16. Lee Y.K and Kim K.N.: Effect of water on mechanical degradation of dental ceramics. J. Dent. Res. 80: 641 Abstract 916, 2001
  17. Barret A.A. Grimaudo N.J .. Anusavice K.J. and Moorhead J.E.: Environmental effect on surface structure and strength of an 'Hydrothermal' ceramic. J . Dent. Res. 77: 128 Abstract 180, 1998
  18. Risto C.. Liithy H.. Loeffel O. and Scharer P.: Chemische loslichksit und festigeit von niedrigschmel-zenden denralporzellanen. Schweiz Monatsschr Zahnmed 105: 611-616 1995
  19. Wiederhorn S.M.: Moisture assisted crack growth in ceramics. Int. J. of Fracture Mechanics. 4(2): 171-177, 1968
  20. Bando Y.. Ito S. and Tomozawa M.: Direct observation of crack tip geometry of SiO2 glass by high-resolution electron microscopy. Communications of the Am. Ceram. Soc. 67: C36- C37, 1984
  21. Ito S. and Tomozawa M.: Crack blunting of high-silica glass. J. Am. Ceram. Soc. 65: 368-371. 1982
  22. Morena R., Beaudreau G.M.,Lock wood P.E. Evans A.L. and Fairhurst C.W.: Fatigue of dental ceramics in a simulated oral environment. J. Dent. Res 65(7): 993-997, 1986
  23. Davis K.M. and Tomozawa M.: Water diffusion into silica glass: structural changes in silica glass and their effect on water solubility and diffusivity. J. of Non-Crystalline Solids 185:203-220. 1995
  24. Li H. and Tomozawa M.: Mechanical strength increase of abrad -ed silicaglass by high pressure water vapor treatment. J. of Non-Crystalline Solids 168: 287-292. 1994
  25. Evans AG.: Slow crack growth in brittle mateirals under dynamic loading conditions. Int. J. Fracture 10: 251-259. 1974
  26. ISO 6872. Dental Ceramic 8.3. Flexural Strength. Geneva. 1995
  27. KSL 3114 Testing method for apparent porosity. water absorptio and specific gravity of fired bricks
  28. Lawn B.R and Fuller E.R: Equilibrium penny-like cracks indent -ation fracture. J. Mat. Sci. 12: 2016-2024. 1975
  29. Thylstrup A. and Fejerskov O.: Textbook of Clinical Cariology 2nd edition 1986. pp.1743 Munksgaard Copenhagen Denmark
  30. Mirvish S.S. Reimers K.J .. Kutler B.. Chen S.. Haorah J .. Morris C.R. Grandjean A.C. and Lyden E.R: Nitrate and nitrite concentrations in human saliva for men and women at different ages and times of the day and their consistency over time. European J. of Cancer Prevention 9: 335-342. 2000
  31. Giordano R. Cima M. and Rober R: Effect ofsurface finish on the flexural strength of feldspathic and aluminous dental ceramics. lnt. J. Prosthodont 8: 311-319. 1995
  32. Davis K.M. and Tomozawa M.: An infrared spectroscopic study of water- related species in silica glasses. J. of Non-Crystalline Solids 201: 177-198. 1996
  33. Tomozawa M.: Fracture of glasses. Annu, Rev. Mater. Sci. 26: 43-74. 1996
  34. 兪炳卨, 朴萬基, 廉貞祿: 機器分析, 1990. pp. 2-23. 378-389. 東明社
  35. Jones D.W. and Wilson H.J.: Porosityin dental ceramics. Brit. Dent. J. 138: 16-21. 1975
  36. Jestel N.L.. Morris M.D. and O' Brien W.J.: Depth-resolved Taman microprobe examination of a commercial dental porcelain exposed to a simulated oral environment. Dent. Mater. 14:375-382. 1998
  37. Drummond J.L. and Lenke J.W.: Physiological aging of an All-Ceramic restorative material. Dent. Mater. 7: 133-137. 1991
  38. Sherrill C.A and O' Brien W.J.: Transverse strength of aluminous and feldspathic porcelain. J. Dent. Res 53(3): 683-690. 1974 https://doi.org/10.1177/00220345740530032801
  39. Denry I.L.. Rosenstiel S.F.. Holloway J.A and Niemiec M.S.: Enhanced chemical strengthening of feldspathic dental porcelain. J. Dent. Res. 72(10): 1429-1433. 1993
  40. Fairhurst C.W.. Lockwood P.E.. Ringle R.D. and Thompson W.O.: The effect of glaze on porcelain strength. Dent. Mater. 8: 203-207. 1992
  41. Kelly J.R., Nishimura I. and Campbell S.D.: Ceramics in dentistry: historical roots and current perspec-tives. J. Prosthet. Dent. 75: 18-32. 1996
  42. Alkhiary Y. WU B. and Giordano R: Effects of repeated firing on composition of veneering ceramics J. Dent. Res. 80: 544 Abstract 142, 2001