Effects of Ferrule and Diameter of Parallel Cast Post and Core on Fracture Resistance

Authors

  • Ahmad Maalhagh-Fard University of Detroit Mercy
  • Rafael Rocha Pacheco University of Detroit Mercy
  • Karanjot Gill University of Detroit Mercy
  • Warren Charles Wagner University of Detroit Mercy

DOI:

https://doi.org/10.14295/bds.2019.v22i4.1720

Abstract

Objectives: The aim of this study was to evaluate the effects of using different diameters of parallel cast posts with, or without ferrule, on the overall fracture resistance of Cast Post and Core (CPC).

Material and methods: Forty (40) endodontically treated human maxillary central incisors were divided into four groups (n=10): [F1] 1.0 mm diameter post with ferrule; [NF1] 1.0 mm diameter cast post without ferrule; [F1.5] 1.5 mm diameter cast post with ferrule; [NF1.5] 1.5 mm diameter post without ferrule. For all teeth, the post space (9.0 mm, in depth) was prepared using ParaPostTM drill. CPC using base metal alloy were fabricated and were cemented using resin modified glass ionomer (RMGI) cement along with the PFM crowns. A universal testing machine (Instron) was used to apply horizontal force perpendicular to the long axis of the tooth at the center of lingual surface, until catastrophic failure. Data was submitted to two-way ANOVA and Scheffé tests (P<0.05).

Results: Both post diameter and ferrule statistically affected the maximum load at fracture (P=0.004 and P=0.013, respectively). The highest mean values were observed for samples with ferrule and wider post size (490N), while the lowest were observed for samples without ferrule and narrower post size (254N). There was no relationship between the presence of a ferrule and post size (P=0.937).

Conclusions: For endodontically treated teeth with no ferrule, a wider-diameter cast post increases fracture resistance of a CPC and PFM crown procedure.

Author Biographies

Ahmad Maalhagh-Fard, University of Detroit Mercy

Associate Professor, DDS, MS, Department of Restorative Dentistry, University of Detroit Mercy, School of Dentistry

Rafael Rocha Pacheco, University of Detroit Mercy

Assistant Professor, DDS, MSc, PhD, Department of Restorative Dentistry, University of Detroit Mercy, School of Dentistry

Karanjot Gill, University of Detroit Mercy

Doctor of Dental Surgery

Warren Charles Wagner, University of Detroit Mercy

Retired Associate Professor, PhD, Department of Restorative Dentistry, University of Detroit Mercy, School of Dentistry

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Published

2019-10-31

Issue

Vol. 22 No. 4 (2019): Oct. - Dec. / 2019 - Published October 2019

Section

Clinical or Laboratorial Research

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