Human non-decalcified histology of three dental implants 45 months under function—a case report

• Published in: International journal of implant dentistry 2019-09, Vol.5 (1), p.1-6, Article 33
• Main Authors: Faeda, Rafael Silveira, do Nascimento, Suzana Clesia Silverio, Santos, Pâmela Leticia, Boeck, Rodolfo Jorge, Sartori, Rafael, Margonar, Rogério, Marcantonio, Elcio
• Format: Article
• Language: English
• Subjects: Birefringence; Bones; Case Report; Case reports; Circular polarization; Circularly polarized light; Collagen; Collagen fiber orientation; Dental implants; Dentistry; Fractures; Histology; Medicine; Polarized light; Surgical implants; Tooth-implant connection; Transplants & implants
• ISSN: 2198-4034; 2198-4034
• DOI: 10.1186/s40729-019-0184-4

Background 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. This study aimed to evaluate bone tissue around three fractured titanium implants retrieved from a human maxilla, by histomorphometric and birefringence analyses. Case report For 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%. Conclusion Within 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.