Effect of composite thickness over the fiber post on fracture resistance of endodontically treated teeth

  • Kasra Rahimipour Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran, Islamic Republic of.
  • Narges Panahandeh Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran, Islamic Republic of. https://orcid.org/0000-0001-6889-7801
  • Seyedeh Mahsa Sheikh-Al-Eslamian | mahsa.sheikh@gmail.com Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran, Islamic Republic of. https://orcid.org/0000-0002-2000-9921
  • Reza Mousavi Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran, Islamic Republic of.
  • Hassan Torabzadeh Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran, Islamic Republic of. https://orcid.org/0000-0002-3262-7102

Abstract

Aim: This study aimed to assess the effect of composite thickness over the fiber post on fracture resistance of endodontically treated teeth.

Methods: This in vitro, experimental study was performed on 50 sound human premolars, which were randomly divided into 5 groups (n=10). Teeth in Group 1 remained intact while other specimens underwent root canal treatment with a Mesio-occluso-distal (MOD) cavity preparation, restored with fiber posts with a distance of 1.5 mm to the occlusal surface in groups 2 and 4 and 0.5 mm in groups 3 and 5. 24 hours of incubation was applied for groups 1-3 and 1 year of incubation for groups 4 and 5. Thereafter fracture strength measured using a Universal Testing Machine at a crosshead speed of 1 mm/minute. Data were analyzed using Shapiro-Wilk, Two-Way ANOVA and Tukey HSD.

Results: The results showed a significant difference in terms of fracture resistance (P<0.05). The difference in fracture resistance between Group 1 and other groups was not statistically significant at 24 h (P>0.05). Also, Tukey HSD revealed no statistically significant differences between Group 1 and 4 at one year. However, Group 1 (1255.25±280.61N) exhibited significantly higher fracture resistance than that of Group 5 (855.72±300.20N) at one year (P=0.027). The difference between other groups was not significant at any time point (P>0.05).

Conclusions: By covering the fiber post with 1.5 mm thickness of composite resin and cuspal reduction of 2 mm, the fracture resistance of endodontically treated teeth can be increased to the level of sound teeth.

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Published
2020-06-04
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Original Articles
Keywords:
Composite Resin, Conservative Dentistry, Endodontically Treated Teeth, Fiber Post, Fracture Resistance, Restorative Dentistry
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How to Cite
Rahimipour, K., Panahandeh , N., Sheikh-Al-Eslamian, S. M., Mousavi, R., & Torabzadeh, H. (2020). Effect of composite thickness over the fiber post on fracture resistance of endodontically treated teeth. Giornale Italiano Di Endodonzia, 34(1). https://doi.org/10.32067/GIE.2020.34.01.11