Abstract
BackgroundFracture of an implant is a quite rare event but represents an important opportunity to evaluate the peri-implant bone tissue response to implant overload in human beings. This study aimed to evaluate bone tissue around three fractured titanium implants retrieved from a human maxilla, by histomorphometric and birefringence analyses.Case reportFor this, the implants and the surrounding bone were removed after having been united to a tooth in function for 45 months, by a 4-mm internal diameter trephine bur, following an undecalcified section was obtained. The results showed a rate of 77.3% of bone-to-implant contact (BIC) and 80.3% of bone area filling within the limits of the implant threads. Under circularly polarized light microscopy investigation, the amount of the transverse collagen fibers was of 48.11%, and the amount of the longitudinal collagen fibers was of 51.89%.ConclusionWithin the limitation of this study, the possible cause of the implant fracture could be the association of overload, inadequate implant diameter, and fragile internal hexagon connection.
Highlights
Fracture of an implant is a quite rare event but represents an important opportunity to evaluate the peri-implant bone tissue response to implant overload in human beings
The osseointegration process is defined as the direct contact of living bone and a loaded implant at the microscopic level [1]. This event has been shown by different animal models [2,3,4] and in a few human histological reports [5], being influenced by many variable like systemic conditions, implant surface macro- and microtexture [6, 7], and prosthetic restoration stability [8]
An osseointegrated fractured implant represents a very useful opportunity to study, in human beings, the effects of overloading of the peri-implant bone microstructure [8]. The aim of this case report was to describe three sandblasted and acidetched implants fractured after 45 months of load, and analyze the peri-implant bone microstructure
Summary
Fracture of an implant is a quite rare event but represents an important opportunity to evaluate the peri-implant bone tissue response to implant overload in human beings. The osseointegration process is defined as the direct contact of living bone and a loaded implant at the microscopic level [1] This event has been shown by different animal models [2,3,4] and in a few human histological reports [5], being influenced by many variable like systemic conditions (diabetes mellitus [3] and cigarette smoking [4]), implant surface macro- and microtexture (roughness and treatment methods) [6, 7], and prosthetic restoration stability [8]. An osseointegrated fractured implant represents a very useful opportunity to study, in human beings, the effects of overloading of the peri-implant bone microstructure [8] The aim of this case report was to describe three sandblasted and acidetched implants fractured after 45 months of load, and analyze the peri-implant bone microstructure
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