Methods: 110 class V lesions in 19 patients (mean age 58, age range 52-71) were restored using fluoride releasing adhesive bonding system (Reactmer Bond, Shofu) and glass-ionomer restorative material (Reactmer, Shofu) according to the manufacturer's instructions. Each restoration was completed by the department staff who was well trained for more than ten years. Two examiners evaluated the restorations. Clinical performance of each restoration was evaluated by each operator just after treatment, 6 mounths, one year, two year and five year intervals according to the USPHS criteria. During the examination periods, missed restorations were also noted.
Results: Most of the patients returned after six months , one-year and two year recalls (96% recall rate). But after five years, 11 patients (52%) returned and 47 restorations (29%) were checked. 24 cervical restorations were missing due to retention loss after five years. And 3 teeth were capped with ceramic crowns. During each checking period of restorations, the main finding was protrusion of restorations from the cavities. Pulpal response, such as spontaneous pain , hot and cold stimulation and percussion pain was not observed after each time period . Moderate marginal discoloration was recognized in 15 restorations at the end of fifth year. Color change was not observed in any restoration.
Conclusions: The retention rate of this fluoride releasing material dramaticaly decreased after two years. It was concluded that the excessive water sorption of material mainly influenced marginal integrity and retention rate of the restorations during long clinical trial.