European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
December 2016
Print ISSN:
0965-7452
Electronic ISSN:
2396-8893
Vol:
24
Issue:
4

Does Ferrule Effect Affect Implant-Abutment Stability?

ABSTRACT
Purpose: This study investigated the influence of placing implant-supported crowns on the torque loss of the abutment screw before and after loading. Material and methods: Twenty implant-abutment assemblies were randomly assigned to two groups. The first group was consisted of abutments with abutment-level finishing line (abutmentlevel), and in the second group the crown margin was placed on the implant shoulder(implant-level). Initial torque loss was recorded for all specimens. After 500000 cyclic load of 75 N and frequency of 2 Hz, post loading torque loss was recorded. Finite element model of each group was also modeled and screw energy, and stress were analyzed and compared between two groups. Results: ANOVA for repeated measurements showed that the torque loss did not change significantly after cyclic loading (P=0.73). Crown margin also had no significant effect on the torque loss (P=0.56). However, the energy
and stress of screw in abutment-level model (4.49 mJ and 22.74 MPa) was higher than implant-level model (3.52 mJ and 20.81 MPa). Conclusion: Although embracing the implant with crown produced less stress and energy in the abutment-implant screw, it did not have any significant influence on the torque loss of the screw.

Keywords
Dental Implant
Screw Loosening
Ferrule Effect

doi: 10.1922/EJPRD_01607Mohajerfar06

Article Price
£15.00
Institution Article Price
£
Page Start
186
Page End
191
Authors
Dr Maryam Mohajerfar, Dr Elaheh Beyabanaki, Prof. Allahyar Geramy, Prof. Hakimeh Siadat, Dr Marzieh Alikhasi

Articles from this issue

  • Title
  • Pg. Start
  • Pg. End

  1. Letter to the Editor
  2. 170
  3. 170

  1. Titanium Corrosion: Implications For Dental Implants
  2. 171
  3. 180

  1. Effect of Implant Diameter And Alloy on Peri-Implant Strain: An In Vitro Quantitative Strain Analysis
  2. 181
  3. 185

  1. Does Ferrule Effect Affect Implant-Abutment Stability?
  2. 186
  3. 191

  1. Acrylic Reinforcement with Off the Shelf Perforated Metal Plates
  2. 192
  3. 196

  1. Qualitative Beam Profiling of Light Curing Units for Resin Based Composites
  2. 197
  3. 202

  1. The Effect of Irradiation Distance on Light Transmittance and Vickers Hardness Ratio of Two Bulkfill Resin-based Composites
  2. 203
  3. 214

  1. One-Piece Implant-Retained Mandibular Overdentures By Pre-Fabricated Titanium Telescopic Attachments and Frictional Varnish: A Two Year Prospective Study
  2. 215
  3. 221

  1. Retrospective Study of the Survival and Patient Satisfaction with Composite Dahl Restorations in the Management of Localised Anterior Tooth Wear
  2. 222
  3. 229