Clinical Study of Fibre- Reinforced Root Posts with a Ten-Year Observation Period: A Retrospective Study.

To analyze the survival rates and influential factors of in situ root posts from 2007 to 2017, identifying key parameters affecting their longevity. The study included all restorations treated at the Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe-University, from 2007 to 2017, involving 1120 fibre-reinforced root posts with an 8.0% dropout rate and a significance level of alpha ⟨5%. Patients had a mean age of 61.1±14.37 years. The study found a survival rate of 60.71±14.70 years versus a loss at 64.58±10.45 years (p⟨0.05). The periodontal condition was the most significant factor affecting survival. Cytec Blanco and DT light post showed similar ten-year survival rates of 79.17% and 79.34%, respectively, without significant differences. Periodontal health was the most critical factor for root post loss. Root post loss is more influenced by patient's periodontal health and the indication for root canal treatment than by the structural characteristics of the fibre posts. This retrospective cohort study addresses the lack of longterm (⟩10 years) clinical research on fibre-reinforced root posts, focusing on various factors influencing their success or failure.