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Evaluation of Reverse Torque Values and Failure Loads of Three Different Abutment Designs with Internal Connections by AzamSadat Mostafavi; Saied Nokar; Habib Hajimiragha; Leyla Sadighpour is a Dentistry article available to read on EtoBox.

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## Background: High percentage of biomechanical complications such as screw loosening in dental implants can be related to implant–abutment (I/A) connection properties which affect the behavior of implant assembly against functional loads in the oral cavity. The aims of the present study were to compare the reverse torque values (RTVs) and failure loads of three abutment types with internal Morse taper connection. ## Materials and Methods: In this experimental __in vitro__ study, eighteen implants (4.5 mm × 10 mm bone level implants, Implantium, Dentium Co, Seoul, South Korea) were divided into three groups with different abutments: two-piece (TP) abutment, one-piece (OP) abutment, and screw abutment (SA), mounted in stainless-steel blocks according to ISO 14801. After completion the torque/detorque protocol, a compressive load (1 mm/min) was applied at 30° off-axis until failure. Mean reverse torque/tightening torque (RT/TT) values and failure loads were analyzed with one-way ANOVA test and Tukey's honest significant difference (α = 0.05). Failure modes were evaluated by radiography and stereomicroscopy. ## Results: RT/TT values in the TP group were lower than those in other group

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Author

AzamSadat Mostafavi; Saied Nokar; Habib Hajimiragha; Leyla Sadighpour

Publisher

Wolters Kluwer - Medknow

Published

2020

Language

EN

Field

Dentistry (Health Sciences)