Abstract
This study aimed to investigate the tensile bond strength between soft relining materials and different denture base materials. The study was conducted in accordance with ISO 23401:2023. A total of 288 rectangular specimens (10L×10H×20Wmm) were fabricated from various denture base materials, including a heat-compression polymethylmethacrylate (PMMA), two types of milled PMAA, and three types of 3D-printed resins, with bonding using two chairside soft reline materials (Coe-Soft and Lynal). Specimens were placed in distilled water for 24h before applying tensile force at a 5mm/min crosshead speed. The tensile bond strength values (MPa) were calculated at maximum tensile force (N) before failure. Two-way ANOVA and post hoc multiple comparison tests were used to assess the effect of denture base and soft reline materials on the tensile bond strength (α=0.05). A significant difference in the tensile bond strength was found among the different types of denture base materials (p<0.001), regardless of relining material type. Lynal-relined milled IvoBase demonstrated the highest tensile bond strength (0.5±0.06MPa), followed by Lynal-relined milled Lucitone (0.44±0.03MPa), both of which are clinically acceptable as they are equal or greater 0.44MPa. The lowest tensile bond strength was detected in Lynal-relined 3D printed FotoDent (0.09±0.02MPa). Lynal exhibited significantly higher tensile bond strength (p<0.05) than Coe-Soft soft reline material when bonded to PMMA bases; however, there was no significant difference between Lynal and Coe-Soft when bonded to 3D-printed base materials (p>0.05). The tensile bond strength between soft relining materials and denture bases is material-dependent, influenced by both the type of denture base material and the type of soft relining material used.
Published Version
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More From: Journal of prosthodontics : official journal of the American College of Prosthodontists
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