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VOLUME 5 , ISSUE 2 ( July-December, 2020 ) > List of Articles


Impact of Mechanical Load of Three Post and Core Systems: CAD/CAM-fabricated Glassfiber, Prefabricated Glassfiber Customized with Composite Resin, and Cast Metal Posts and Cores

Iris NB Seckler, Carlos E da Silveira Bueno, Augusto S Kato, Sérgio L Pinheiro, Débora AN Leite Lima, Danielle FS de Souza

Citation Information : Seckler IN, da Silveira Bueno CE, Kato AS, Pinheiro SL, Lima DA, de Souza DF. Impact of Mechanical Load of Three Post and Core Systems: CAD/CAM-fabricated Glassfiber, Prefabricated Glassfiber Customized with Composite Resin, and Cast Metal Posts and Cores. Cons Dent Endod J 2020; 5 (2):36-41.

DOI: 10.5005/jp-journals-10048-0064

License: CC BY-NC 4.0

Published Online: 01-03-2021

Copyright Statement:  Copyright © 2020; The Author(s).


Aim and objective: This study assessed the fracture resistance and failure mode frequencies in three post and core systems: CAD/CAM-fabricated glassfiber post and core, glassfiber post and core customized with composite resin, and cast metal post and core. Materials and methods: After endodontic obturation and the post space preparation, 30 extracted mandibular premolars were distributed into three groups (n = 10): Group GFP: glassfiber post and core customized with composite resin, Group CPC: cast metal, and Group CAD/CAM: CAD/CAM-fabricated glassfiber post and core. All the specimens were luted with RelyX U200 cement, submitted to thermomechanical cycling, and then submitted to a compression test, applied at a 45° angle relative to the long axis of the tooth, until fracture. The fracture resistance data were submitted to ANOVA complemented by the Tukey test and the failure mode data by Fisher's exact test with the Freeman–Halton extension (α = 5%). Results: There was no significant difference between the fracture resistance values found for groups CPC and CAD/CAM (p >0.05), and these values were significantly higher than those found for Group GFP (p < 0.05). In respect to failure mode frequencies, Group CAD/CAM had equal frequencies of adhesive and cohesive failures, Group GFP had exclusively cohesive failures in the composite core buildup, and Group CPC had 80% of cohesive failures in dentin vs 20% of adhesive failures (p < 0.001). Conclusion: The fracture resistance of CAD/CAM-fabricated glassfiber posts and cores was comparable to that of cast posts and cores, and they were not associated with irreparable root fractures. Therefore, CAD/CAM-fabricated glassfiber posts and cores can be considered an effective method for restoring endodontically treated teeth. Clinical significance: CAD/CAM system proved to be a viable alternative to cast posts and cores, since they were less associated with irreparable root fractures.

  1. Influence of different posts and cores on marginal adaptation, fracture resistance, and fracture mode of composite resin crowns on human mandibular premolars. An in vitro study. J Dent 2006;34(5):326–335. DOI: 10.1016/j.jdent.2005.07.007.
  2. Comparison of fracture resistance between cast posts and fiber posts: a meta-analysis of literature. J Endod 2013;39(1):11–15. DOI: 10.1016/j.joen.2012.09.026.
  3. Association of quality of coronal filling with the outcome of endodontic treatment: a follow-up study. Dent J 2017;5(1):1–8. DOI: 10.3390/dj5010005.
  4. Fracture resistances of zirconia, cast Ni-Cr, and fiber-glass composite posts under all-ceramic crowns in endodontically treated premolars. J Adv Prosthodont 2017;9(3):170–175. DOI: 10.4047/jap.2017.9.3.170.
  5. The effect of intraradicular multiple fiber and cast posts on the fracture resistance of endodontically treated teeth with wide root canals. Biomed Res Int 2018;2018:16714981–6. DOI: 10.1155/2018/1671498.
  6. Comparison of fracture resistance between cast, CAD/CAM milling, and direct metal sintering metal post systems. J Prosthodont Res 2016;60(1):23–28. DOI: 10.1016/j.jpor.2015.08.001.
  7. Three-year follow up of customized glass fiber esthetic posts. Eur J Dent 2011;5(1):107–112. DOI: 10.1055/s-0039-1698865.
  8. CAD/CAM post-and-core using different esthetic materials: fracture resistance and bond strengths. Am J Dent 2017;30(6):299–304.
  9. Performance of CAD/CAM fabricated fiber posts in oval-shaped root canals: an in vitro study. Am J Dent 2017;30(5):248–254.
  10. Effect of surface treatments on the bond strength of CAD/CAM fiberglass posts. J Clin Exp Dent 2018;10(6):591–597. DOI: 10.4317/jced.54904.
  11. A study on stress distribution to cement layer and root dentin for post and cores made of CAD/CAM materials with different elasticity modulus in the absence of ferrule. J Clin Exp Dent 2019;11(1):1–8. DOI: 10.4317/jced.55295.
  12. Fracture resistance and failure pattern of endodontically treated teeth restored with computer-aided design/computer-aided manufacturing post and cores: a pilot study. J Contemp Dent Pract 2019;20(1):56–63. DOI: 10.5005/jp-journals-10024-2476.
  13. Fracture behaviors of maxillary central incisors with flared root canals restored with CAD/CAM integrated glass fiber post-and-core. Dent Mater J 2019;38(1):114–119. DOI: 10.4012/dmj.2017-394.
  14. A comparison of the fracture resistances of endodontically treated mandibular premolars restored with endocrowns and glass fiber post-core retained conventional crowns. J Adv Prosthodont 2016;8(6):489–493. DOI: 10.4047/jap.2016.8.6.489.
  15. Effect of ferrule on the fracture resistance of mandibular premolars with prefabricated posts and cores. J Adv Prosthodont 2017;9(5):328–334. DOI: 10.4047/jap.2017.9.5.328.
  16. A comparison of canal preparations in straight and curved root canals. Oral Surg Oral Med Oral Pathol 1971;32(2):271–275. DOI: 10.1016/0030-4220(71)90230-1.
  17. Retention and failure mode after cyclic loading in two post and core systems. J Prosthet Dent 1996;75(5):506–511. DOI: 10.1016/s0022-3913(96)90454-0.
  18. Effect of operator experience on the outcome of fiber post cementation with different resin cements. Oper Dent 2013;38(5):555–564. DOI: 10.2341/11-494-L.
  19. The role of resin cement on bond strength of glass-fiber posts luted into root canals: a systematic review and meta-analysis of in vitro studies. Oper Dent 2014;39(1):31–44. DOI: 10.2341/13-070-LIT.
  20. A comparison of the fracture resistance of premolars without a ferrule with different post systems. J Prosthet Dent 2020;123(3):523.e1–523.e5. DOI: 10.1016/j.prosdent.2019.08.018.
  21. Evaluation of mechanical and optical behavior of current esthetic dental restorative CAD/CAM composites. J Mech Behav Biomed Mater 2015;55:1–11. DOI: 10.1016/j.jmbbm.2015.10.004
  22. Effect of CAD/CAM glass fiber post-core on cement micromorphology and fracture resistance of endodontically treated roots. Am J Dent 2017;30(1):3–8.
  23. The effect of different full-coverage crown systems on fracture resistance and failure pattern of endodontically treated maxillary incisors restored with and without glass fiber post. J Endod 2008;34(7):842–846. DOI: 10.1016/j.joen.2008.03.025.
  24. Compressive and flexural behavior of fiber reinforced endodontic posts. J Dent 2012;40(11):968–978. DOI: 10.1016/j.jdent.2012.08.003.
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