The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Effect of coloring liquids on biaxial flexural strength of monolithic zirconia

착색 용액이 단일 구조 지르코니아의 이축 굴곡 강도에 미치는 영향

  • Jung, Chaeyul (Department of Prosthodontics, Wonkwang University Sanbon Dental Hospital) ;
  • Kim, Min-Jeong (Department of Prosthodontics, Wonkwang University Sanbon Dental Hospital) ;
  • Kim, Jae-Hyun (Department of Prosthodontics, Wonkwang University Sanbon Dental Hospital)
  • 정채율 (원광대학교 산본치과병원 치과 보철과) ;
  • 김민정 (원광대학교 산본치과병원 치과 보철과) ;
  • 김재현 (원광대학교 산본치과병원 치과 보철과)
  • Received : 2020.12.23
  • Accepted : 2021.03.24
  • Published : 2021.04.30
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Abstract

Purpose. The aim of this study was to evaluate biaxial flexural strength and hardness of colored monolithic zirconia after dipping in different time intervals of coloring solution. Materials and Methods. Disk shaped specimens were prepared from monolithic zirconia (Eclipse V2.0, AMS, Gimpo, Korea). Four experimental groups were categorized (n = 12) due to coloring time (PU (0s); ST (8s); OV (1 min); PS (preshade)), to evaluate biaxial flexural strength and Vickers hardness. After fracture, X-ray diffraction analysis was performed using fractured specimens. Results were analyzed with one-way ANOVA test. Results. There was no significant difference between groups in the biaxial flexural strength test. However, in the Vickers hardness test, the group with standard dipping time (ST) showed significantly higher value than the group without dipping in coloring liquid (PU)(P=.038). Also, there was no significant difference in the rest of the groups (P>.05). As a result of X-ray diffraction analysis, specific peaks of tetragonal phase were shown and the volume of monoclinic phase fraction was lower than 25%. Conclusion. Although this study has several limitations, coloring liquids had no significant effect on biaxial flexural strength. Vickers hardness was significantly different between the group to which the coloring liquid was applied and the group to which the coloring solution was not applied, but there was no significant difference between the other groups. Also, the flexural strength of monolithic zirconia corresponds to Class 5 of the minimal flexural strength standard according to the use of dental ceramics.

목적: 본 연구의 목적은 유색의 단일구조 지르코니아의 이축 굴곡 강도와 경도를 평가하고, 착색 용액의 적용에 따른 지르코니아의 강도 변화를 알아보는 것이다. 재료 및 방법: 단일 구조 지르코니아 시편(Eclipse V2.0, AMS, Korea)을 동일 크기의 디스크 형태로 밀링하고, 지르코니아 착색 용액의 적용 시간에 따라 4개의 군으로 분류(n = 12)하였다(PU, ST, OV, PS). 각 시편의 이축 굴곡 강도를 측정하고, Vickers 경도를 측정했다. 파절 시험 이후, 파절된 시편을 이용하여, X-선 회절 분석을 시행하였다. 결과 분석은 One-way ANOVA를 이용하여 분석했다. 결과: 2축 굴곡 강도 실험에서는 그룹 간에 유의한 차이가 없었다. 하지만 Vickers 경도 실험에서 제조사 지시대로 착색용액을 적용한 그룹이 착색 용액을 적용하지 않은 그룹보다 유의하게 값이 높았다 (P = .038). 나머지 그룹 간 Vickers 경도는 유의한 차이가 없었다 (P > .05). X-ray 회절 분석 결과 모든 군의 X-ray 회절 분석 상에는 정방정상의 특이적 피크를 보여주었고, 모든 단사정상 분율은 25%미만이었다. 결론: 지르코니아 착색용액의 적용 여부 및 적용 시간은 이축 굴곡 강도에 유의한 영향을 미치지 않았다. Vickers 경도는 제조사 지시대로 착색 용액을 적용한 그룹과 착색 용액을 적용하지 않은 그룹 간에는 유의한 차이가 있었으나, 나머지 그룹 간에는 유의한 차이가 없었다. 본 실험에 사용한 지르코니아 시편의 이축 굴곡 강도 결과는 치과용 세라믹 용도에 따른 최소 굴곡 강도 기준의 Class 5에 해당하였다.

Keywords

References

  1. Pittayachawan P, McDonald A, Young A, Knowles JC. Flexural strength, fatigue life, and stress-induced phase transformation study of Y-TZP dental ceramic. J Biomed Mater Res B Appl Biomater 2009;88:366-77. https://doi.org/10.1002/jbm.b.31064
  2. Seok SH, Lee YM, Lee SH, Moon HR, Yang HC, Lim BS. Evaluation of leaching components and color stability for colored dental zirconia with various coloring liquids. Korean J Dent Mater 2014;41:185-95. https://doi.org/10.14815/kjdm.2014.41.3.185
  3. Guazzato M, Albakry M, Ringer SP, Swain MV. Strength, fracture toughness and microstructure of a selection of all-ceramic materials. Part II. Zirconia-based dental ceramics. Dent Mater 2004;20:449-56. https://doi.org/10.1016/j.dental.2003.05.002
  4. Kong MC, Kim KJ, Kwon TY, Hong MH. The effects of the number of times dipped in coloring liquid and final sintering temperature on flexural strength of zirconia ceramics : Zirconia ceramics having improved transparency. Korean J Dent Mater 2017;44:171-8. https://doi.org/10.14815/kjdm.2017.44.2.171
  5. Ocana M, Gonzalez-Elipe AR, Andres-Verges M, Tartaj P, Serna CJ, Orera VM. Preparation by hydrolysis of aerosols and colour properties of Cr-doped and Co-doped zircon powders. J Eur Ceram Soc 1998;18:821-30. https://doi.org/10.1016/S0955-2219(97)00208-2
  6. Oh JJ. Noh HR. Effect of metal chloride liquids on color and strength changes of tetragonal zirconia polycrystals. J Dent Hyg Sci 2015;15:577-84. https://doi.org/10.17135/jdhs.2015.15.5.577
  7. Hjerppe J, Narhi T, Froberg K, Vallittu PK, Lassila LV. Effect of shading the zirconia framework on biaxial strength and surface microhardness. Acta Odontol Scand. 2008;66:262-7. https://doi.org/10.1080/00016350802247123
  8. Tuncel I, Turp I, Usumez A. Effect of color shading procedures and cyclic loading on the biaxial flexural strength of zirconia. Niger J Clin Pract 2018;21:7-12.
  9. Sedda M, Vichi A, Carrabba M, Capperucci A, Louca C, Ferrari M. Influence of coloring procedure on flexural resistance of zirconia blocks. J Prosthet Dent 2015;114:98-102. https://doi.org/10.1016/j.prosdent.2015.02.001
  10. Cattell MJ, Clarke RL, Lynch EJ. The biaxial flexural strength and reliability of four dental ceramics-Part II. J Dent 1997;25:409-14. https://doi.org/10.1016/S0300-5712(96)00059-0
  11. Seo DG, Roh BD. The comparison of relative reliability on biaxial and three point flexural strength testing methods of light curing composite resin. J Korean Acad Conserv Dent 2006;31:58-65. https://doi.org/10.5395/JKACD.2006.31.1.058
  12. Garvie RC, Nicholson PS. Phase analysis in zirconia systems. J Am Ceram Soc 1972;55:303-5. https://doi.org/10.1111/j.1151-2916.1972.tb11290.x
  13. Toraya H, Yoshimura M, Somiya S. Calibration curve for quantitative analysis of the monoclinic‐tetragonal ZrO2 system by X‐ray diffraction. J Am Ceram Soc 1984;67:119-21.
  14. Orhun E. The effect of coloring liquid dipping time on the fracture load and color of zirconia ceramics. J Adv Prosthodont 2017;9:67-73. https://doi.org/10.4047/jap.2017.9.1.67
  15. Yu NK, Park MG. Effect of different coloring liquids on the flexural strength of multilayered zirconia. J Adv Prosthodont 2019;11:209-14. https://doi.org/10.4047/jap.2019.11.4.209
  16. Bittar BF, Miranda JS, Simoes AC, Ramos NC, Machado JP, Zhang Y, Souza RO, Leite FPP. Effect of extrinsic pigmentation and surface treatments on biaxial flexure strength after cyclic loading of a translucent ZrO2 ceramic. Dent Mater J 2019;35:1644-53. https://doi.org/10.1016/j.dental.2019.08.117
  17. Kong HJ. Flexural strength and reliability of highly translucent colored zirconia. J Dent Rehab Apll Sci 2020;36:41-7. https://doi.org/10.14368/jdras.2020.36.1.41
  18. Chung SM. Yap AUJ, Chandra SP, Lim CT. Flexural strength of dental composite restoratives: Comparison of biaxial and three-point bending test. J Biomed Mater Res B Appl Biomater 2018;106:1524-33. https://doi.org/10.1002/jbm.b.33959
  19. Harada K, Shinya A, Yokoyama D, Shinya A. Effect of loading conditions on the fracture toughness of zirconia. J Prosthodont Res 2013;57:82-7. https://doi.org/10.1016/j.jpor.2013.01.005
  20. Pittayachawan P, McDonald A, Petrie A, Knowles JC. The biaxial flexural strength and fatigue property of Lava Y-TZP dental ceramic. Dent Mater 2007;23:1018-29. https://doi.org/10.1016/j.dental.2006.09.003
  21. Garvie RC, Hannink RH, Pascoe RT. Ceramic steel. Nature 1975;258:703-4 https://doi.org/10.1038/258703a0
  22. Ozer F, Naden A, Turp V, Mante F, Sen D, Blatz MB. Effect of thickness and surface modifications on flexural strength of monolithic zirconia. J Prosthet Dent 2018;119:987-93. https://doi.org/10.1016/j.prosdent.2017.08.007