Influence of implant/abutment joint designs on abutment screw loosening in a dental implant system

2005 ◽  
Vol 75B (2) ◽  
pp. 457-463 ◽  
Author(s):  
Tsuyoshi Kitagawa ◽  
Yasuhiro Tanimoto ◽  
Misako Odaki ◽  
Kimiya Nemoto ◽  
Masahiro Aida
Keyword(s):  
Dental Implant ◽  
Screw Loosening ◽  
Implant Abutment ◽  
Implant System ◽  
Abutment Screw

scholarly journals INFLUENCE OF DIFFERENT IMPLANT ABUTMENT CONNECTION DESIGNS ON ABUTMENT SCREW LOOSENING IN DENTAL IMPLANT SYSTEMS – A SYSTEMATIC REVIEW.

2019 ◽  
Vol 3 (8) ◽  
Author(s):  
Dr. Prerna N Kulkarni ◽  
Dr. Nilesh S Bulbule ◽  
Dr. Dilip M Kakade ◽  
Dr. Shalu S Mondal ◽  
Dr. Akanksha Bhandari
Keyword(s):  
Systematic Review ◽  
Dental Implant ◽  
English Language ◽  
Sample Population ◽  
Screw Loosening ◽  
Success Rates ◽  
Eligibility Criteria ◽  
Implant Abutment ◽  
Connection Design ◽  
Abutment Screw

Background: Dental implants have provided an alternative method of prosthetic rehabilitation with high long-term success rates. However, mechanical or biological complications may occur with implants amongst which loosening of the screw is very common. Loosening of the screw might cause misfit of implant‒abutment interface and may occur due to preload loss subsequent to inadequate  initial torque, distortion of the screw, wear of the screw, overloading, and micro-movements because of functional loading. The implant-abutment connection design like internal hex, external hex and morse taper may affect the screw stability. The effect of various implant-abutment connections on the stability of abutment screw has been discussed in this systematic review. Aim: The aim of this review is to assess and compare effect of different abutment connections on loosening of the screw. Data Sources: An online search was made for the articles using Google Scholar and PubMed. Study Eligibility Criteria: Articles published in English language or those articles that have a detailed summary in English language were included. Articles published between 1st January 2000 and 30th September 2018 were selected. Scientific research papers, Randomized controlled trials were included with data on the effect of various implant abutment connections on the loosening of the screw. Results: Out of 449 articles that were identified through electronic database searching. 19 articles were selected. These articles were screened for duplicates and 7 articles were obtained after eliminating the duplicates. None were excluded after screening of the duplicate articles. This review provides an understanding of effect of various abutment connections on loosening of the screw. Limitations: Few articles do not give concrete conclusions due to smaller sample sizes, differences inter-study sample population, variety of groups compared. Conclusions: Out of all studies that were evaluated few stated that internal hex connection design had least screw loosening compared to external hex and morse taper while the other studies were inconclusive. Keywords: Dental Implant, Implant-Abutment Connection, Screw Loosening

scholarly journals The Evolution of External and Internal Implant–Abutment Connections: A Review

2012 ◽  
Vol 2 (2) ◽  
pp. 37
Author(s):  
D.R. Prithviraj ◽  
Ninad Muley ◽  
Vikas Gupta
Keyword(s):  
Native Speakers ◽  
Screw Loosening ◽  
Implant Abutment ◽  
Primary Determinant ◽  
Native Speakers Of English ◽  
Over Time ◽  
Abutment Screw

A study of the implant–abutment connection is of great importance because it is the primary determinant of the strength and stability of an implant-supported restoration, which, in turn, determines the restoration’s prosthetic stability. Traditionally, Brånemark’s external hexagon has been used, but significant complications, such as abutment screw loosening, rotational misfit at the implant–abutment interface, and microbial penetration have led to modification of the external hexagon and the development of internal implant–abutment connections. In this review, we describe various implant–abutment connections that have evolved over time from the traditional external hexagon.  How to cite this article: Alharissy M, Dayoub S. The Evolution of External and Internal Implant–Abutment Connections: A Review. Int Dent Res 2012;2:37-42. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals In Vitro Evaluation of Manual Torque Values Applied to Implant-Abutment Complex by Different Clinicians and Abutment Screw Loosening

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Onur Dincer Kose ◽  
Burcin Karataslı ◽  
Sabit Demircan ◽  
Taha Emre Kose ◽  
Erhan Cene ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Optical Microscope ◽  
Control Group ◽  
Screw Loosening ◽  
Loading Test ◽  
Torque Wrench ◽  
Implant Abutment ◽  
Torque Values ◽  
Abutment Screw

Preload is applied to screws manually or using a torque wrench in dental implant systems, and the preload applied must be appropriate for the purpose. The aim of this study was to assess screw loosening and bending/torsional moments applied by clinicians of various specialties following application of manual tightening torque to combinations of implants and abutments. Ten-millimeter implants of 3.7 and 4.1 mm diameters and standard or solid abutments were used. Each group contained five implant-abutment combinations. The control and experimental groups comprised 20 and 160 specimens, respectively. Implants in the experimental group were tightened by dentists of different specialties. Torsional and bending moments during tightening were measured using a strain gauge. Control group and implants with preload values close to the ideal preload were subjected to a dynamic loading test at 150 N, 15 Hz, and 85,000 cycles. The implants that deformed in this test were examined using an optical microscope to assess deformities. Manual tightening did not yield the manufacturer-recommended preload values. Dynamic loading testing suggested early screw loosening/fracture in samples with insufficient preload.

scholarly journals Biomechanical Evaluation of the Effects of Implant Neck Wall Thickness and Abutment Screw Size: A 3D Nonlinear Finite Element Analysis

2020 ◽  
Vol 10 (10) ◽  
pp. 3471 ◽  
Author(s):  
Ming-Dih Jeng ◽  
Yang-Sung Lin ◽  
Chun-Li Lin
Keyword(s):  
Finite Element ◽  
Wall Thickness ◽  
Alveolar Bone ◽  
Nonlinear Finite Element ◽  
Bone Strain ◽  
Concentrated Force ◽  
Element Analysis ◽  
Implant Abutment ◽  
Implant System ◽  
Abutment Screw

In this study, we evaluate the influence of implant neck wall thickness and abutment screw size on alveolar bone and implant component biomechanical responses using nonlinear finite element (FE) analysis. Twelve internal hexagon Morse taper implant–abutment connection FE models with three different implant sizes (diameters 4, 5, and 6 mm), secured with 1.4, 1.6, and 1.8 mm abutment screws to fit with three unilateral implant neck wall thicknesses of 0.45, 0.50, and 1.00 mm, were constructed to perform simulations. Nonlinear contact elements were used to simulate realistic interface fixation within the implant system. A 200 N concentrated force was applied toward the center of a hemispherical load cap and inclined 30° relative to the implant axis as the loading condition. The simulation results indicated that increasing the unilateral implant neck wall thickness from 0.45 to 1.00 mm can significantly decrease implant, abutment, and abutment screw stresses and bone strain, decreased to 58%, 48%, 54%, and 70%, respectively. Variations in abutment screw size only significantly influenced abutment screw stress, and the maximum stress dissipation rates were 10% and 29% when the diameter was increased from 1.4 to 1.6 and 1.8 mm, respectively. We conclude that the unilateral implant neck wall thickness is the major design factor for the implant system and implant neck wall thickness in effectively decreasing implant, abutment, and abutment screw stresses and bone strain.

Removal of Fractured Dental Implant Screw Using a New Technique: A Case Report

2012 ◽  
Vol 38 (6) ◽  
pp. 747-750 ◽  
Author(s):  
Manpreet S. Walia ◽  
Saryu Arora ◽  
Reena Luthra ◽  
Prabhjot Kaur Walia
Keyword(s):  
Case Report ◽  
Dental Implant ◽  
New Technique ◽  
Clinical Report ◽  
Screw Loosening ◽  
Biological Factors ◽  
Implant Abutment ◽  
A New Technique

Implant restorations can fail biologically or mechanically. Biological factors include unsuccessful osseointegration or presence of peri-implantitis. Mechanical failures include crown fracture, framework fracture, screw loosening, and screw fracture. Fracture of the implant abutment can be a serious problem as the fragment remaining inside the implant may prevent the implant from functioning efficiently. The procedure used for removal of the fractured screw portion is described in this clinical report.

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