The Journal of Contemporary Dental Practice

Register      Login



Volume / Issue

Online First

Related articles

VOLUME 19 , ISSUE 4 ( 2018 ) > List of Articles


Fracture Strength of Posterior Crowns made of Adoro and Gradia Fiber-reinforced Composites

Hosseinali Mahgoli, Mahnaz Arshad, Mehdi Saeedirad, Mohammad H Mahgoli

Keywords : Composite resin, Crown, Gradia, Laboratory

Citation Information : Mahgoli H, Arshad M, Saeedirad M, Mahgoli MH. Fracture Strength of Posterior Crowns made of Adoro and Gradia Fiber-reinforced Composites. J Contemp Dent Pract 2018; 19 (4):393-397.

DOI: 10.5005/jp-journals-10024-2272

License: CC BY-NC 3.0

Published Online: 01-04-2018

Copyright Statement:  Copyright © 2018; The Author(s).


Aim: The aim of this study was to assess the fracture strength of posterior crowns made of Adoro and Gradia fiber-reinforced composites (FRCs). Materials and methods: In this in vitro, experimental study, extracted sound 37 maxillary first and second premolars were selected. A celluloid index was taken from teeth and the teeth received crown preparation. Impressions were made and poured. Composite crowns were fabricated of Adoro and Gradia composite resins. After curing, the teeth were immersed in distilled water for 24 hours and thermal cycled for 6,000 cycles between 5 and 55°C. Load was applied at a crosshead speed of 1 mm/minute and the fracture strength was measured. Specimens were inspected under a stereomicroscope to determine the mode of failure. Results: The fracture strength was 1,631.77 N for Gradia and 1,569.84 N for Adoro. The difference between the fracture strength of the two groups was not significant (p > 0.05). The mode of failure was cohesive in composite in 7 specimens and adhesive between composite and fiber in 12 specimens in the Gradia group. In the Adoro group, the mode of failure was cohesive within composite in 11 specimens and adhesive between composite and fiber in 7 specimens. Complete tear of fiber did not occur in any group. Conclusion: The fracture strength of Gradia and Adoro composites is not significantly different. Clinical significance: Cohesive fracture within the fiber did not occur in any case in our study and the mode of failure was adhesive at the fiber–composite interface or cohesive within the composite in most specimens.

PDF Share
  1. Mandiga S. Estafan D. An esthetic challenge: case report utilizing a combination of monolithic ceramic veneers and porcelain fused to metal crown. Int J Dent Oral Health 2015;1(5):1-4.
  2. Tyas MJ, Anusavice KJ, Frencken JE, Mount GJ. Minimal intervention dentistry—a review. FDI Commission Project 1-97. Int Dent J 2000 Feb;50(1):1-12.
  3. Peters MC, McLean ME. Minimally invasive operative care. I. Minimal intervention and concepts for minimally invasive cavity preparations. J Adhes Dent 2001 Spring;3(1):7-16.
  4. Leinfelder KF. Using composite resin as a posterior restorative material. J Am Dent Assoc 1991 Apr;122(4):65-70.
  5. Waki T, Nakamura T, Nakamura T, Kinuta S, Wakabayashi K, Yatani H. Fracture resistance of inlay-retained fixed partial dentures reinforced with fiber-reinforced composite. Dent Mater J 2006 Mar;25(1):1-6.
  6. Rappelli G, Scalise L, Procaccini M, Tomasini EP. Stress distribution in fiber-reinforced composite inlay fixed partial dentures. J Prosthet Dent 2005 May;93(5):425-432.
  7. Roulet JF. Buonocore memorial lecture. Adhesive dentistry in the 21st century. Oper Dent 2000 Sep-Oct;25(5):355-366.
  8. McLean JW. Evolution of dental ceramics in the twentieth century. J Prosthet Dent 2001 Jan;85(1):61-66.
  9. Glantz PO, Ryge G, Jendresen MD, Nilner K. Quality of extensive fixed prosthodontics after five years. J Prosthet Dent 1984;52:475-479.
  10. Lehmann F, Eickemeyer G, Rammelsberg P. Fracture resistance of metal-free composite crowns—effects of fiber reinforcement, thermal cycling, and cementation technique. J Prosthet Dent 2004 Sep;92(3):258-264.
  11. Fernandes NA, Vally ZI, Sykes LM. The longevity of restorations—a literature review. S Afr Dent J 2015 Oct;70(9): 410-413.
  12. Wataha JC. Biocompatibility of dental casting alloys: a review. J Prosthet Dent 2000 Feb;83(2):223-234.
  13. Rudo DN, Karbhari VM. Physical behaviors of fiber reinforcement as 1- Council on Dental Materials, Instruments, and Equipment. Report on base metal alloys for crown and bridge applications. J Am Dent Assoc 1985;111:479-483.
  14. Levi L, Barak S, Katz J. Allergic reactions associated with metal alloys in porcelain-fused-to-metal fixed prosthodontic devices—a systematic review. Quintessence Int 2012 Nov-Dec;43(10):871-877.
  15. Moffa JP, Beck WD, Hoke AW. Allergic response to nickel containing dental alloys. J Dent Res 1977;56:1378.
  16. Morris HF. Veterans administration cooperative studies projects No.147. 4. Biocompatibility of base metal alloys. J Dent 1987 Jul;58(1):1-4.
  17. Freilich MA, Meiers JC, Duncan JP, Goldberg AJ. Fiberreinforced composites in clinical dentistry. 1st ed. Hanover Park, IL: Quintessence 2000; chapter 1,2,3.
  18. Friedlander LD, Munoz CA, Goodacre CJ, Doyle MG, Moore BK. The effect of tooth preparation design on the breaking strength of Dicor crowns: part 1. Int J Prosthodont 1990 Mar-Apr;3(2):159-168.
  19. Josephson BA, Schulman A, Dunn ZA, Hurwitz W. A compressive strength study of an all-ceramic crown. J Prosthet Dent 1985 Mar;53(3):301-303.
  20. Xie Q, Lassila LV, Vallittu PK. Comparison of load-bearing capacity of direct resin-bonded fiber-reinforced composite FPDs with four framework designs. J Dent 2007 Jul;35(7): 578-582.
  21. Garoushi S, Yokoyama D, Shinya A, Vallittu PK. Fiberreinforced composite resin prosthesis to restore missing posterior teeth: a case report. Libyan J Med 2007;2(3):139-114.
  22. Behr M, Rosentritt M, Latzel D, Kreisler T. Comparison of three types of fiber reinforced composite molar crowns on their fracture resistance and marginal adaptation. J Dent 2001 Mar;29(3):187-196.
  23. Aghazadeh J, Rafiee A, Barzegaran V, Shafieif. Compressive fatigue behavior of dental restorative composites. Dent Mater J 2007 Nov;26(6):827-837.
  24. Loose M, Rosentritt M, Leibrock A, Behr M, Handel G. Invitro study of fracture strength and marginal adaptation of fiber-reinforced-composite versus all ceramic and fixed partial dentures. Eur J Prosthodont Restor Dent 1998 Jun;6(2): 55-62.
  25. Mange P, Belser US. Porcelain versus composite inlay/onlays: effects of mechanical loads on stress distribution, adhesion, and crown flexure. Int J Periodontics Restorat Dent 2003 Dec;23(6):543-555.
  26. Song HY, Yi Y, Cho LR, Park DY. Effect of two preparation designs and pontic distance on bending and fracture strength of fiber-reinforced composite inlay fixed partial dentures. J Prosthet Dent 2003 Oct;90(4):347-353.
  27. Scherrer SS, De Rijk WG, Belser US. Fracture resistance of human enamel and three all-ceramic systems on extracted teeth. Int J Prosthodont 1996 Nov-Dec;9(6):580-585.
  28. Yoshinari M, Derand T. Fracture strength of all-ceramic crowns. Int J Prosthodont 1994;7:329-338.
  29. Graig RG, Powers JM. Restorative dental material. 11th ed. St. Louis, MO: Mosby; 2002. Chapter 4,9.
  30. Stiesch-Scholz M, Schulz K, Borchers L. In vitro fracture resistance of four-unit fiber-reinforced composite fixed partial dentures. J Dent Mater 2006 Apr;22(4):374-381.
  31. Ereifej NS, Oweis YG, Altarawneh SK. Fracture of fiberreinforced composites analyzed via acoustic emission. Dent Mater J 2015;34(4):417-424.
  32. Behr M, Rosentritt M, Mangelkramer M, Handle G. The influence of different cements on the fracture resistance and marginal adaptation of all-ceramic and fiber-reinforced crown. Int J Prosthodont 2003 Sep-Oct;16(5):538-542.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.