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Accuracy in the Interface between Implant Components after a 5-year Functional Period; A Clinical Report

 Seung Rye Song  ;  Leegang Yoo  ;  Bock-Young Jung 
 Journal of Korean Academy of Advanced General Dentistry, Vol.11(2) : 49-53, 2022-05 
Journal Title
Journal of Korean Academy of Advanced General Dentistry
Issue Date
Functional integrity ; Internal fit ; Machining tolerance
The reduction in the assembly accuracy of the implant complex could result from fatigue and micromovement during the functional phases and from the manufacturing process. The long-term functional integrity of implant prostheses can be ensured by accurate fit of the interfaces between the assemblies from a biomechanical perspective. A single implant restoration on the mandibular left first molar was removed after a 5-year functional period due to mobility, which was diagnosed as abutment screw loosening. The superstructure could not be retrieved, despite exceeding the torque value recommended by the manufacturer; therefore, the restoration was unscrewed and removed. The retrieved restoration, particularly the configuration of the abutment-gold cylinder and abutment-retaining screw interfaces, was analyzed with scanning electron microscopy. Moreover, the assembly accuracy of the old and new assemblies was compared. In the new specimen, a relatively an even linear gap was found between the threads of the abutment and screw and no vertical marginal gaps were found at the abutment-cylinder interface, wherein the horizontal and vertical contacts were incomplete. In the old specimen, an irregular pattern of screw-thread engagement, an irregular linear space at the abutment-cylinder interface, a partially worn-out screw configuration and remnants of the screw in the interface were observed.
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2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
Yonsei Authors
Jung, Bok Yeong(정복영) ORCID logo https://orcid.org/0000-0002-8186-2109
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