Retention of a telescopic overdenture on customized abutments after the simulation of 1 year in function

Background.Telescopic implant-retained overdentures are considered one of the most common treatment modalities for edentulous patients.Objectives.The aim of the study was to evaluate the retention of a BioHPP (biocompatible highperformance polymer) telescopic overdenture supported by customized abutments made from 2 different materials after the simulation of 1 year in function. Material and methods.Twelve models of a completely edentulous mandible were three-dimensionally (3D)-printed.Two implants and 2 groups of customized abutments -group Bio: BioHPP (n = 6) and group Ti: titanium (n = 6) -were used to support BioHPP telescopic overdentures.A vertically dislodging force was applied to each denture until its separation before and after 240,000 cycles of chewing simulation and 1,440 iterations of cyclic dislodgement for the simulation of 1 year in function in order to measure maximum tensile loads needed to dislodge the overdenture.Student's t test and the paired t test were used for the statistical analysis (α = 0.05).Results.The initial and final retentive forces of the Ti group were significantly higher than in the case of the Bio group.A significant decrease in the retentive forces within the 2 groups after chewing simulation was observed and it was higher in group Ti; however, there was no statistically significant difference between the 2 groups. Conclusions.The retentive force values for implant-retained telescopic overdentures significantly decreased after the simulation of 1 year of overdenture use.Both BioHPP and titanium are considered suitable abutment materials to retain telescopic overdentures.