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Does Ferrule Effect Affect Implant-Abutment Stability? Publisher Pubmed



Mohajerfar M1, 2, 3 ; Beyabanaki E1, 2, 3 ; Geramy A1, 2, 3 ; Siadat H1, 2, 3 ; Alikhasi M1, 2, 3
Authors
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Authors Affiliations
  1. 1. Dental Research Center, Dental Implant Research Center, Dentistry Research Institute, Department of Prosthodontics, Tehran University of Medical Sciences, North Amirabad, Tehran, Iran
  2. 2. Dental Research Center, Dental Implant Research Center, Dentistry Research Institute, Department of Prosthodontics, Tehran University of Medical Sciences, North Amirabad, Tehran, Iran
  3. 3. Dental Research Center, Dental Implant Research Center, Dentistry Research Institute, Department of Prosthodontics, Tehran University of Medical Sciences, North Amirabad, Tehran, Iran

Source: The European journal of prosthodontics and restorative dentistry Published:2016


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 (abutment-level), 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).; CONCLUSIONS: 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.