Fixed, fiber-reinforced resin bridges on 5.0mm implants in severely atrophic mandibles: up to 5-years follow-up of a prospective cohort study

Publication date: Available online 12 December 2017
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Rudolf Seemann, Florian Wagner, Mauro Marincola, Rolf Ewers
PurposeThe aim of this study is to evaluate the midterm outcomes of fixed full arch fiber-reinforced resin bridges on ultrashort implants in terms of marginal bone loss and overall implant survival.MethodsPatients with severely atrophic mandibles, corresponding to Cawood and Howell Class V and VI, were included in this prospective temporal cohort study. Mesial and distal peri-implant bone levels were measured on panoramic radiographs taken at the time of implant insertion (baseline) and at follow-up visits.ResultsA total of 17 patients with atrophic mandibular jaws with an average follow-up of 2.9 ±1.5 years were included. The cumulative one-, three- and five-year patient-based implant survival rates (CSR) were 94.1%, and the cumulative implant survival rates 98.5%, respectively.The marginal bone level of the mesial implant was 0.0±0.3mm at the time of loading (n=33), -0.1±0.3mm (n=20) after one year, -0.4±0.5 (n=10) after three years, and-1.5±1.0 (n=4) after five years. The mesial bone level depended significantly on time and insertion depth. The marginal bone level of the distal implant was -0.4±0.4mm (n=34) at the time of implantation, -0.4±0.6mm (n=20) after one year, -0.5±0.5 (n=10) after three years, and -2.2±1.7 (n=4) after five years. The distal bone level depended significantly on time and insertion depth.ConclusionFixed full arch fiber-reinforced resin bridges retained by four ultrashort implants provide a comparatively cost-effective, safe and stable alternative for prosthetic restoration of the severely atrophic mandible. The overall implant survival rate, and the MBL after 5 years are equivalent to threaded implants of conventional lengths.



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