Acta Scientific Dental Sciences (ASDS)(ISSN: 2581-4893)

Research Article Volume 5 Issue 9

In Vitro Evaluation of the Flexural Strength of Different Temporary Crown Materials, After Thermocycling

Georges El Najjar1,3*, Halal R2, Daou M3 and Zebouni E1

1Department of Fixed Prosthetics, Saint-Joseph University, Lebanon
2Private Practice, Lebanon
3Department of Pediatric Dentistry, Saint-Joseph University, Lebanon

*Corresponding Author: Georges El Najjar, Research Assistant, Department of Fixed Prosthetics, Saint-Joseph University, Lebanon.

Received: July 17, 2021s; Published: August 24, 2021


Objective of this Study: To study the variation of flexural strength as a function of time during an interval simulating a time span of a year in the mouth and determine whether the mechanical performance of the materials in question remains acceptable.

Materials and Methods: Three types of materials are used: bis-acrylic resin (Tempsmart® and Cooltemp®), conventional PMMA (Unifast III®) and composite resin (Revoteck LC®). The flexural strength is evaluated. The samples undergo thermal cycling up to 10 000 cycles and are evaluated at different points in time.

Results: The bis-acrylic and conventional PMMA showed acceptable results throughout this study. The bis-acrylic material Tempsmart® showed the best values. The composite material Revoteck LC® has shown to be inadequate.

Conclusion: Among the tested materials, Tempsmart® is the most suited for long-term temporary restorations.

Keywords: Flexural Strength; Temporary Restoration; Bis-Acrylic Resin; Composite Resin; Conventional PMMA


  1. Burns DR., et al. “A review of selected dental literature on contemporary provisional fixed prosthodontic treatment: report of the Committee on Research in Fixed Prosthodontics of the Academy of Fixed Prosthodontics”. Journal of Prosthetic Dentistry 5 (2003): 474-497.
  2. Luthardt RG., et al. “Clinical performance and periodontal outcome of temporary crowns and fixed partial dentures: A randomized clinical trial”. Journal of Prosthetic Dentistry 1 (2000): 32-39.
  3. Donaldson KJ. “Fundamentals of fixed prosthodontics, fourth edition”. The British Dental Journal 8 (2012): 427-427.
  4. Patras M., et al. “Management of provisional restorations’ deficiencies: a literature review”. Journal of Esthetic and Restorative Dentistry 1 (2012): 26-38.
  5. Lang R., et al. “Fracture resistance of PMMA and resin matrix composite-based interim FPD materials”. The International Journal of Prosthodontics 4 (2003): 381-384.
  6. Ogliari FA., et al. “Influence of chain extender length of aromatic dimethacrylates on polymer network development”. Dental Materials 2 (2008): 165-171.
  7. Kerby RE., et al. “Mechanical properties of urethane and bis-acryl interim resin materials”. Journal of Prosthetic Dentistry1 (2013): 21-28.
  8. Guo J-H., et al. “Influence of Physical Aging on Mechanical Properties of Polymer Free Films: The Prediction of Long-Term Aging Effects on the Water Permeability and Dissolution Rate of Polymer Film-Coated Tablets”. Pharmaceutical Research12 (1991): 1500-1504.
  9. Gale MS and Darvell BW. “Thermal cycling procedures for laboratory testing of dental restorations”. Journal of Dentistry2 (1999): 89-99.
  10. De Munck J., et al. “A critical review of the durability of adhesion to tooth tissue: methods and results”. Journal of Dental Research2 (2005): 118-132.
  11. Akiba S., et al. “Influence of different curing modes on flexural properties, fracture toughness, and wear behavior of dual-cure provisional resin-based composites”. Dental Materials Journal 5 (2019): 728-737.
  12. Jo LJ., et al. “Flexural strength and hardness of resins for interim fixed partial dentures”. Indian Journal of Dental Research Off Publ Indian Journal of Dental Research 1 (2011): 71-76.
  13. Poonacha V., et al. “In vitro comparison of flexural strength and elastic modulus of three provisional crown materials used in fixed prosthodontics”. Journal of Clinical and Experimental Dentistry5 (2013): e212-217.
  14. Mehrpour H., et al. “Evaluation of the Flexural Strength of Interim Restorative Materials in Fixed Prosthodontics”. Journal of Dentistry3 (2016): 201-206.
  15. Shibasaki S., et al. “Influence of Different Curing Modes on Polymerization Behavior and Mechanical Properties of Dual-Cured Provisional Resins”. Operative Dentistry5 (2017): 526-536.
  16. Takamizawa T., et al. “Mechanical Properties and Simulated Wear of Provisional Resin Materials”. Operative Dentistry6 (2015): 603-613.
  17. Wassell RW., et al. “Crowns and other extra-coronal restorations: provisional restorations”. The British Dental Journal 11 (2002): 619-622.
  18. Koumjian JH and Nimmo A. “Evaluation of fracture resistance of resins used for provisional restorations”. Journal of Prosthetic Dentistry 6 (1990): 654-657.
  19. Hagge MS., et al. “Shear bond strength of bis-acryl composite provisional material repaired with flowable composite”. Journal of Esthetic and Restorative Dentistry American Academy of Cosmetic Dentistry 1 (2002): 47-52.
  20. Zweben C., et al. “Test Methods for Fiber Tensile Strength, Composite Flexural Modulus, and Properties of Fabric-Reinforced Laminates”. In: Tsai S, editor. Composite Materials: Testing and Design (Fifth Conference). West Conshohocken, PA: ASTM International (1979): 228-262.


Citation: Georges El Najjar., et al.In Vitro Evaluation of the Flexural Strength of Different Temporary Crown Materials, After Thermocycling”. Acta Scientific Dental Sciences 5.9 (2021): 121-134.


Copyright: © 2021 Georges El Najjar., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Acceptance rate33%
Acceptance to publication20-30 days

Indexed In

News and Events

  • Certification for Review
    Acta Scientific certifies the Editors/reviewers for their review done towards the assigned articles of the respective journals.
  • Submission Timeline for Upcoming Issue
    The last date for submission of articles for regular Issues is April 30th, 2024.
  • Publication Certificate
    Authors will be issued a "Publication Certificate" as a mark of appreciation for publishing their work.
  • Best Article of the Issue
    The Editors will elect one Best Article after each issue release. The authors of this article will be provided with a certificate of "Best Article of the Issue".
  • Welcoming Article Submission
    Acta Scientific delightfully welcomes active researchers for submission of articles towards the upcoming issue of respective journals.

Contact US