The Journal of Advanced Prosthodontics

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

DOI QR Code

Effect of connector configuration on the fracture load in conventional and translucent zirconia three-unit fixed dental prostheses

  • Received : 2023.04.03
  • Accepted : 2023.08.10
  • Published : 2023.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

PURPOSE. The purpose of this study was to determine the effect of the connector configuration on the fracture load in conventional and translucent zirconia of three-unit fixed dental prostheses (FDPs). MATERIALS AND METHODS. Six different three-unit FDPs were prepared (n = 6) from three types of zirconia (3Y-TZP (Katana ML®), 4Y-TZP (Katana STML®), and 5Y-TZP (Katana UTML®)) in combination with two connector configurations (4 × 2.25, 3 × 3 mm). The CoCr master models were scanned, and the FDPs were designed and fabricated using CAD-CAM. The FDPs were cemented on the metal model and then loaded with a UTM at a crosshead speed of 1 mm/min until failure. Two-way ANOVA and Tukey's test were used for statistical analysis (α = .05). RESULTS. Fracture loads of 3Y-TZP (2740.6 ± 469.2 and 2718.7 ± 339.0 N for size 4 × 2.25 mm and 3 × 3 mm, respectively) were significantly higher than those of 4Y-TZP (1868.3 ± 281.6 and 1663.6 ± 372.7 N, respectively) and 5Y-TZP (1588.0 ± 255.0 and 1559.1 ± 110.0 N, respectively) (P < .05). No significant difference was found between fracture loads of 4Y-TZP and 5Y-TZP (P > .05). The connector configuration within 9 mm2 was found to have no effect on the fracture loads on all three types of zirconia (P > .05). CONCLUSION. Fracture loads of three-unit FDPs were affected by the type of zirconia. The fracture loads of conventional zirconia were higher than those of translucent zirconia. However, it was not affected by the connector configuration when the connector had a cross-sectional area of 9 mm2.

Keywords

Acknowledgement

The author would like to thank the Department of Prosthodontics, Faculty of Dentistry, Mahidol University for financial support and the Research Service section for searching and providing equipment and materials in the laboratory and supporting and developing equipment and materials.

References

  1. Joiner A. Tooth colour: a review of the literature. J Dent 2004;32 Suppl 1:3-12. https://doi.org/10.1016/j.jdent.2003.10.013
  2. Dangra Z, Gandhewar M. The use of newer high translucency zirconia in aesthetic zone. Case Rep Dent 2014;2014:432714.
  3. Tuncel I, Turp I, usumez A. Evaluation of translucency of monolithic zirconia and framework zirconia materials. J Adv Prosthodont 2016;8:181-6. https://doi.org/10.4047/jap.2016.8.3.181
  4. Kelly JR, Tesk JA, Sorensen JA. Failure of all-ceramic fixed partial dentures in vitro and in vivo: analysis and modeling. J Dent Res 1995;74:1253-8. https://doi.org/10.1177/00220345950740060301
  5. Dittmer MP, Kohorst P, Borchers L, Stiesch-Scholz M. Finite element analysis of a four-unit all-ceramic fixed partial denture. Acta Biomater 2009;5:1349-55. https://doi.org/10.1016/j.actbio.2008.11.015
  6. Oh WS, Anusavice KJ. Effect of connector design on the fracture resistance of all-ceramic fixed partial dentures. J Prosthet Dent 2002;87:536-42. https://doi.org/10.1067/mpr.2002.123850
  7. Poppel ML, Rosentritt M, Sturm R, Beuer F, Hey J, Schmid A, Schmidt F. Fracture load and fracture patterns of monolithic three-unit anterior fixed dental prostheses after in vitro artificial aging-a comparison between color-gradient and strength-gradient multilayer zirconia materials with varying yttria content. J Clin Med 2022;11:4982.
  8. Larsson C, Holm L, Lovgren N, Kokubo Y, Vult von Steyern P. Fracture strength of four-unit Y-TZP FPD cores designed with varying connector diameter. An in-vitro study. J Oral Rehabil 2007;34:702-9. https://doi.org/10.1111/j.1365-2842.2007.01770.x
  9. Filser F, Kocher P, Weibel F, Luthy H, Scharer P, Gauckler LJ. Reliability and strength of all-ceramic dental restorations fabricated by direct ceramic machining (DCM). Int J Comput Dent 2001;4:89-106.
  10. Onodera K, Sato T, Nomoto S, Miho O, Yotsuya M. Effect of connector design on fracture resistance of zirconia all-ceramic fixed partial dentures. Bull Tokyo Dent Coll 2011;52:61-7. https://doi.org/10.2209/tdcpublication.52.61
  11. Zhang F, Inokoshi M, Batuk M, Hadermann J, Naert I, Van Meerbeek B, Vleugels J. Strength, toughness and aging stability of highly-translucent Y-TZP ceramics for dental restorations. Dent Mater 2016;32:e327-37. https://doi.org/10.1016/j.dental.2016.09.025
  12. Tabatabaian F. Color aspect of monolithic zirconia restorations: a review of the literature. J Prosthodont 2019;28:276-87. https://doi.org/10.1111/jopr.12906
  13. Kolakarnprasert N, Kaizer MR, Kim DK, Zhang Y. New multi-layered zirconias: Composition, microstructure and translucency. Dent Mater 2019;35:797-806. https://doi.org/10.1016/j.dental.2019.02.017
  14. Denry I, Kelly JR. State of the art of zirconia for dental applications. Dent Mater 2008;24:299-307. https://doi.org/10.1016/j.dental.2007.05.007
  15. Zhang Y. Making yttria-stabilized tetragonal zirconia translucent. Dent Mater 2014;30:1195-203. https://doi.org/10.1016/j.dental.2014.08.375
  16. Takuma Y, Nomoto S, Sato T, Sugihara N. Effect of framework design on fracture resistance in zirconia 4-unit all-ceramic fixed partial dentures. Bull Tokyo Dent Coll 2013;54:149-56. https://doi.org/10.2209/tdcpublication.54.149
  17. Esquivel-Upshaw JF, Young H, Jones J, Yang M, Anusavice KJ. Four-year clinical performance of a lithia disilicate-based core ceramic for posterior fixed partial dentures. Int J Prosthodont 2008;21:155-60.
  18. Fayez SH. Katamish, Elguindy J. Effect of connector dimension on the fracture characteristics of cantilever posterior zirconia bridges. Ainshams Dent J 2017:71-84.
  19. Fontijn-Tekamp FA, Slagter AP, Van Der Bilt A, Van 'T Hof MA, Witter DJ, Kalk W, Jansen JA. Biting and chewing in overdentures, full dentures, and natural dentitions. J Dent Res 2000;79:1519-24. https://doi.org/10.1177/00220345000790071501
  20. Kelly JR, Denry I. Stabilized zirconia as a structural ceramic: an overview. Dent Mater 2008;24:289-98. https://doi.org/10.1016/j.dental.2007.05.005
  21. Sakaguchi RL, Powers JM., Craig's restorative dental materials. 13th ed. Mechanical properties. St. Louis; Mosby; 2012. p. 355-67.
  22. Salimi H, Mosharraf R, Savabi O. Effect of framework design on fracture resistance of zirconium oxide posterior fixed partial dentures. Dent Res J (Isfahan). 2012;9:764-9.
  23. Oilo M, Hardang AD, Ulsund AH, Gjerdet NR. Fractographic features of glass-ceramic and zirconia-based dental restorations fractured during clinical function. Eur J Oral Sci 2014;122:238-44. https://doi.org/10.1111/eos.12127