Ossteointegration Of A 26-Year Machined Implant: A Histological Report

Machined dental implants are the first generation of dental implant. In previous studies, surface roughness has been proposed to have a positive effect on ossteointegration, and machined surface interfered with bone interlocking and delayed ossteointegration. In this case report of a 69-year old female patient, a machined grade 2 titanium dental implant (CDIC, China) was inserted 26 years ago in the region of 36. The implant was planned for removal due to external-abutment connection fracture. The implant was removed with a trephine bur, and a rough-surface grade 4 titanium implant (CDIC, China) was immediately inserted. The harvested bone ring with the removed implant was assessed with H&E staining and toluidine blue staining to evaluate ossteointegration. The possible reasons for external-abutment connection fracture could be the relatively low mechanical strength of grade 2 titanium and the lack of follow-up occlusal adjustment. Despite the mechanical complication, clinical observation showed that marginal bone loss within 26 years was approximately 1mm, and H&E staining and toluidine blue staining demonstrated good consistent ossteointegration performance of a machined implant throughout the observation period . Dental implant has been proposed as an approach that has predictable long-term outcomes. This case report showed clinical and histological evidences of the ossteointegration of 26-year machined dental implant.