Wear of Morse taper and external hexagon implant joints after abutment removal.
The aim of this in vitro study was to evaluate the removal torque values on abutments and the morphological wear aspects of two different dental implant joints after immersion in a medium containing biofilm from human saliva. Twenty implant-abutment assemblies were divided into four groups in this study: (A) Morse taper free of medium containing biofilm, and (B) after contact with a medium containing biofilm from human saliva; (C) External Hexagon free of medium containing biofilm, and (D) after contact with medium containing biofilm from human saliva. The abutments were firstly torqued to the implants according to the manufacturer´s recommendations, using a handheld torque meter. Groups B and D were immersed into 24 well-plates containing 2 ml BHI medium with microorganisms for 72 h at 37 °C under microaerophilic conditions. After detorque evaluation, the abutments were removed and the implants were analyzed by scanning electron microscopy (SEM) and profilometry. On the detorque evaluation, the torque values decreased for the external hexagon implants and increased for the Morse taper implants. However, the values were lower when both implant-abutment assemblies were in contact with a medium containing biofilm from human saliva. The wear areas of contacting surfaces of the implants were identified by SEM. The highest average roughness values were recorded on the surfaces free of biofilm. The medium containing biofilm from human saliva affected the maintenance of the torque values on Morse taper and external hexagon abutments. Additionally, the removal of abutment altered the inner implant surfaces resulting in an increase of wear of the titanium-based connection.
Center for Research on Dental Implants (CEPID), School of Dentistry (ODT), Federal University of Santa Catarina (UFSC), Florianópolis, SC, 88040900, Brazil.
Abraão M
AM
Prado
Oral Health and Masticatory System Group (Bellvitge Biomedical Research Group), School of Dentistry, L'Hospitalet de Llobregat, Universitat de Barcelona, Barcelona, 402 4270, Spain.|School of Health Science﻿s (FSC), Universida﻿de Fernando Pessoa (UFP), Porto, 4249-004, Portugal.
Jorge
J
Pereira
Center for MicroElectromechanical Systems﻿ (CMEMS-UMINHO), University of Minho, Guimarães, 480-058, Portugal.
Filipe S
FS
Silva
Center for MicroElectromechanical Systems﻿ (CMEMS-UMINHO), University of Minho, Guimarães, 480-058, Portugal.
Bruno
B
Henriques
Dept. of Materials Engineering, Post-graduate Program in Materials Science and Engineering (PPgCEM/CCET), Federal University of Rio Grande do Norte (UFRN), Natal, 59072-970, RN, Brazil.
Rubens M
RM
Nascimento
Center for Research on Dental Implants (CEPID), School of Dentistry (ODT), Federal University of Santa Catarina (UFSC), Florianópolis, SC, 88040900, Brazil.
Cesar A M
CAM
Benfatti
Oral Health and Masticatory System Group (Bellvitge Biomedical Research Group), School of Dentistry, L'Hospitalet de Llobregat, Universitat de Barcelona, Barcelona, 402 4270, Spain.
José
J
López-López
Center for Research on Dental Implants (CEPID), School of Dentistry (ODT), Federal University of Santa Catarina (UFSC), Florianópolis, SC, 88040900, Brazil. jsouza@dem.uminho.pt.|Center for MicroElectromechanical Systems﻿ (CMEMS-UMINHO), University of Minho, Guimarães, 480-058, Portugal. jsouza@dem.uminho.pt.
Júlio C M
http://orcid.org/0000-0001-7999-4009
JCM
Souza
D018441:Biofilms / Q000254:growth & development; D000044:Dental Abutments; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D012463:Saliva / Q000382:microbiology; D013499:Surface Properties; D014025:Titanium; D019415:Torque
D015921:Dental Implants; D014025:Titanium