Akademik Veri Yönetim Sistemi
The 48. Annual EPA Congress | The 27. Scientific TPID Congress, Nevşehir, Türkiye, 11 - 13 Eylül 2025, (Özet Bildiri)
OBJECTIVE: The aim of this in vitro study was to evaluate the effect of different post-curing times and surface treatments on the soft liner bond strength of acrylic resin material fabricated using three-dimensional (3D) printing.
MATERIALS-METHODS: Half-dumbbell-shaped acrylic resin specimens (7×12×36 mm) were digitally designed using CAD software. A total of 108 specimens were produced using a Digital Light Processing (DLP)-based 3D printer with biocompatible acrylic resin at a 90° build orientation. After production, the specimens were cleaned in isopropyl alcohol and subjected to post-polymerization in a UV curing unit at different exposure cycles (2×1000, 2×2000, and 2×3000). After surface preparation, the specimens were sterilized with ethylene oxide and divided into three main groups based on post-curing duration. Each main group was then randomly divided into three subgroups based on surface treatment: control (no treatment), acid etching, and sandblasting. The subgroups were labeled as follows: Group 1 (2×1000 cycles): G1K (control), G1A (acid), G1S (sandblasting); Group 2 (2×2000 cycles): G2K, G2A, G2S; and Group 3 (2×3000 cycles): G3K, G3A, G3S. Following the surface treatments, a soft liner was applied to all specimens, and tensile bond strength was measured using a universal testing machine. Data were analyzed using two-way analysis of variance (ANOVA) and Shapiro-Wilk normality tests.
RESULTS: Bond strength values varied depending on post-curing time and surface treatment. In Group 1, the acid-etched subgroup (G1A) exhibited the highest bond strength, while the control subgroup (G1K) showed the lowest. In Group 2, the control subgroup (G2K) demonstrated significantly higher bond strength compared to the acid (G2A) and sandblasted (G2S) subgroups. In Group 3, no statistically significant differences in bond strength were observed among the subgroups (p =.090).
CONCLUSION: Different post-curing durations and surface treatments significantly affect the bond strength of soft liners to 3D-printed denture base resins.
Keywords: 3D Printing, Post-Polymerization, CAD/CAM Denture Base, Additive Manufacturing, Soft Liner, Tensile Bond Strength