Journal of Dentistry

Current Issue

By Issue

By Author

By Subject

Author Index

Keyword Index

About Journal

Aims and Scope

Editorial Board

Publication Ethics

Indexing and Abstracting

Related Links

FAQ

Peer Review Process

News

Journal Metrics

The Effect of Finish Line Design on the Fracture Strength of Zirconia Copings

Document Type : Original Article

Authors

1 Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

2 Undergraduate Student of Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

Abstract

Statement of the Problem: One of the major concerns about all ceramic crowns is their fracture resistance.
Purpose: The purpose of this in vitro study was to evaluate the effect of two marginal designs (shoulder 90°, shoulder 135°) on the fracture resistance of zirconia copings.
Materials and Method: In this in vitro study, 20 brass dies were prepared using milling machine: 10 with 1mm width shoulder 90° marginal design and the other 10 with 1mm width shoulder 135° finish line design. Zirconia cores with 0.5mm thickness and 30μm cement space were fabricated on brass dies. The copings were cemented on the dies and fracture test was done using a universal testing machine. Data were analyzed using Mann-Whitney test.
Results: The mean value of fracture resistance for shoulder 90° finish line design were 368.3±109.4 N and for shoulder 135° finish line design were 518.4±115.5 N. Data analysis revealed a statistically significant difference between groups (p < 0.05).
Conclusion: The results of this study showed that the finish line design of zirconia copings influences their fracture resistance. A 135° shoulder finish line design can improve the fracture resistance of zirconia crowns.

Keywords

References
1. Ferracane JL. Using posterior composites appropriately. J Am Dent Assoc. 1992; 123: 53–58. [PubMed] [Google Scholar]
2. Etemadi S, Smales RJ. Survival of resin-bonded porcelain veneer crowns placed with and with-out metal reinforcement. J Dent. 2006; 34: 139–145. [PubMed] [Google Scholar]
3. McLaren EA, White SN. Survival of In-Ceram crowns in a private practice: a prospective clinical trial. J Prosthet Dent. 2000; 83: 216–222. [PubMed] [Google Scholar]
4. Webber B, McDonald A, Knowles J. An in vitro study of the compressive load at fracture of Procera AllCeram crowns with varying thickness of veneer porcelain. J Prosthet Dent. 2003; 89: 154–160. [PubMed] [Google Scholar]
5. Jalalian E, Atashkar B, Rostami R. The effect of preparation design on the fracture resistance of zirconiacrown copings (computer associated design/ computer associated machine, CAD/CAM system) J Dent (Tehran) 2011; 8: 123–129. [PMC free article] [PubMed] [Google Scholar]
6. Jalalian E, Aletaha NS. The effect of two marginal designs (chamfer and shoulder) on the fracture resistance of all ceramic restorations, Inceram: an in vitro study. J Prosthodont Res. 2011; 55: 121–125. [PubMed] [Google Scholar]
7. Ahmadzade A, Golmohammadi F. Comparison of fracture resistance in two marginal design in IPS Emax restorations. J Mash Dent Sch. 2015; 39: 109–116. [Google Scholar]
8. Cho L, Choi J, Yi YJ, Park CJ. Effect of finish line variants on marginal accuracy and fracture strength of ceramic optimized polymer/fiber-reinforced composite crowns. J Prosthet Dent. 2004; 91: 554–560. [PubMed] [Google Scholar]
9. Di*Iorio D, Murmura G, Orsini G, Scarano A, Caputi S. Effect of margin design on the fracture resistance of Procera all ceram cores: an in vitro study. J Contemp Dent Pract. 2008; 9: 1–8. [PubMed] [Google Scholar]
10. Sadan A, Blutz MB, Lang B. Clinical consideration for densly sintered alumina and zirconia restorations. Part1. International Journal of Periodontics and Restorative Dentistry. 2005; 25: 213–219. [PubMed] [Google Scholar]
11. Beuer F, Aggstaller H, Edelhoff D, Gernet W. Effect of preparation design on the fracture resistance of zirconiacrown copings. Dent Mater J. 2008; 27: 362–367. [PubMed] [Google Scholar]
12. Shinya A, Lassila LV, Vallittu PK. The effect of preparation design on the marginal stress of resin-bonded metal-free crowns: a finite element study. Int J Prosthodont. 2008; 21: 445–447. [PubMed] [Google Scholar]
13. Reich S, Petschelt A, Lohbauer U. The effect of finish line preparation and layer thickness on the failure loadand fractography of ZrO2 copings. J Prosthet Dent. 2008; 99: 369–376. [PubMed] [Google Scholar]
14. Jalali H, Sadighpour L, Miri A, Shamshiri AR. Comparison of Marginal Fit and Fracture Strength of a CAD/CAM Zirconia Crown with Two Preparation Designs. J Dent (Tehran) 2015; 12: 874–881. [PMC free article] [PubMed] [Google Scholar]
15. Monaco C, Rosentritt M, Llukacej A, Baldissara P, Scotti R. Margin-al Adaptation, Gap Width, and facture strength of teeth Restored with different all-ceramic Vs Metal Ceramic Crown Systems: An in Vitro Study. Eur J Prosthodont Restor Dent. 2016; 24: 130–137. [PubMed] [Google Scholar]
16. Shillinburg HT. Fundamentals of fixed prosthodontics. 4th ed. Quintessence: USA; 2012. p. 142. [Google Scholar]
17. Vojdani M, Safari A, Mohaghegh M, Pardis S, Mahdavi F. The effect of porcelain firing and type of finish line on the marginal fit of zirconia copings. J Dent (Shiraz) 2015; 16: 113–120. [PMC free article] [PubMed] [Google Scholar]
18. Fujimoto J, Land MF, Rosensteil SF. Contemporary fixed prosthodontics. 4th ed. Mosby Elsevier: USA; 2006. p. 324. [Google Scholar]
Journal of Dentistry
Volume 20, Issue 4 - Serial Number 65
December 2019
Pages 271-275
Files
Share
How to cite
Statistics