Odontology. 2025 Aug 24. doi: 10.1007/s10266-025-01179-1. Online ahead of print.
ABSTRACT
To investigate the influence of different resin composites used for sealing the screw-access hole of zirconia abutments on the fatigue behavior of lithium disilicate ceramic. Eighty 3YSZ abutment discs (IPS e.max ZirCAD MO, Ivoclar AG) (Ø = 10 mm; 3 mm thickness; Ø = 2.5 mm access channel) and lithium disilicate restorative discs (IPS e.max CAD, Ivoclar AG) (Ø = 10 mm; 1 mm thickness) were obtained and randomly allocated into four groups based on the sealing protocol (2 mm of thickness): Ctrl (PFTE Tape); PFTE tape + nanohybrid resin; PFTE tape + bulk-fill resin; and PFTE tape + Flow resin. After cementation procedures, monotonic (n = 5) and cyclic fatigue tests were conducted (n = 15; initial load of 100 N for 5000 cycles, increments of 100 N every 10,000 cycles at 20 Hz, immersed in distilled water) until failure. Fractographic and finite element analysis were also performed. One-way ANOVA and Tukey post-hoc tests were carried out for the monotonic data, while Kaplan-Meier and Mantel-Cox tests were used for survival rates. No statistically significant effect of the presence neither the type of resin composite material was observer after the monotonic tests. For the fatigue test, the Bulk and Nano groups exhibited significantly better performance than the Ctrl and Flow (Ctrl: 1100 N ≤ Flow: 1213 N < Nano: 1340 N ≤ Bulk: 1380 N, p ≤ 0.05). Nanohybrid or bulk-fill resin composites are recommended for sealing the abutment screw-access hole and optimize the performance of lithium disilicate restorations.
PMID:40849850 | DOI:10.1007/s10266-025-01179-1
