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Odontology

, Volume 106, Issue 2, pp 215–222 | Cite as

Effect of fiber post length and abutment height on fracture resistance of endodontically treated premolars prepared for zirconia crowns

  • Jie Lin
  • Jukka Pekka Matinlinna
  • Akikazu Shinya
  • Michael George Botelho
  • Zhiqiang Zheng
Original Article
  • 242 Downloads

Abstract

The purpose of this study was to compare the fracture resistance, mode of fracture, and stress distribution of endodontically treated teeth prepared with three different fiber post lengths and two different abutment heights, using both experimental and finite element (FE) approaches. Forty-eight human maxillary premolars with two roots were selected and endodontically treated. The teeth were randomly distributed into six equally sized groups (n = 8) with different combinations of post lengths (7.5, 11, and 15 mm) and abutment heights (3 and 5 mm). All the teeth restored with glass fiber post (Rely X Fiber Post, 3M ESPE, USA) and a full zirconia crown. All the specimens were thermocycled and then loaded to failure at an oblique angle of 135°. Statistical analysis was performed for the effects of post length and abutment height on failure loads using ANOVA and Tukey’s honestly significant difference test. In addition, corresponding FE models of a premolar restored with a glass fiber post were developed to examine mechanical responses. The factor of post length (P < 0.01) had a significant effect on failure load. The abutment height (P > 0.05) did not have a significant effect on failure load. The highest mean fracture resistance was recorded for the 15 mm post length and 5 mm abutment height test group, which was significantly more resistant to fracture than the 7.5 mm post and 5 mm abutment height group (P < 0.05). The FE analysis showed the peak compression and tension stress values of 7.5 mm post length were higher than that of 11 and 15 mm post length. The stress value of remaining tooth decreased as the post length was increased. Within the limitations of this experimental and FE analysis study, increasing the post length inside the root of endodontically treated premolar teeth restored with glass-fiber posts increase the fracture resistance to non-axial forces. Failure mode is more favorable with reduced abutment heights.

Keywords

Fiber post Post length Abutment height Fracture resistant Finite element analysis 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant no. 81300907).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© The Society of The Nippon Dental University 2017

Authors and Affiliations

  • Jie Lin
    • 1
    • 2
  • Jukka Pekka Matinlinna
    • 3
  • Akikazu Shinya
    • 2
    • 5
  • Michael George Botelho
    • 4
  • Zhiqiang Zheng
    • 1
  1. 1.Department of VIP Dental Service, School and Hospital of StomatologyFujian Medical UniversityFuzhouPeople’s Republic of China
  2. 2.Department of Crown and BridgeThe Nippon Dental University School of Life Dentistry at TokyoTokyoJapan
  3. 3.Dental Materials Science, Faculty of Dentistry, Prince Philip Dental HospitalThe University of Hong KongHong Kong SARPeople’s Republic of China
  4. 4.Oral Rehabilitation, Faculty of Dentistry, Prince Philip Dental HospitalThe University of Hong KongHong Kong SARPeople’s Republic of China
  5. 5.BioCity Turku Biomaterials Research Program, Department of Biomaterials Science, Institute of DentistryUniversity of TurkuTurkuFinland

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