Bond Strength of Nanocomposite Hard Liner to CAD-CAM Milled, 3D Printed, and Conventionally Fabricated Denture Base Resins

• Main Authors: Zainab Albazroun (Author), Atheer Alabdullatif (Author), Sarah Aldehaileb (Author), Ferdoos Alhalimi (Author), Faris A. Alshahrani (Author), Soban Q. Khan (Author), Shaimaa M. Fouda (Author), Hamad S. AlRumaih (Author), Mohammed M. Gad (Author)
• Format: Book
• Published: MDPI AG, 2024-08-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Summary

Background: To investigate the effect of zirconium dioxide nanoparticles (ZrO₂NPs) on the shear bond strength (SBS) of hard denture lines bonded to different denture base resins. Methods: Five different denture bases were used in this study: conventional heat-cured resin, IvoCad, AvaDent, NextDent, and FormLabs, in acrylic specimens of 10 × 10 × 2.5 mm³ (N = 150, n = 10). Specimens were centered at the bottom of a silicon mold to create an auto-polymerized holder. Three major groups of reline material were used: no ZrO₂NPs (control), 2 wt.%, and 4 wt.% ZrO₂NPs. Reline was bonded to the resin surface using a customized jig. After polymerization, specimens were stored in distilled water, and 5000 thermal cycles were performed. Each specimen was fixed to an Instron machine, and SBS was tested using a blade loaded (1 mm/min) at the resin interface until failure. Data was collected and analyzed using two-way ANOVA and post hoc Tukey test (α = 0.05). Results: AvaDent showed the highest SBS when compared with other denture base materials (<i>p</i> < 0.001) except for IvoCad. The addition of ZrO₂NPs significantly decreased the SBS of AvaDent (<i>p</i> = 0.003) and IvoCad (<i>p</i> = 0.001), while heat polymerized resin, Formlabs, and NextDent showed no significant change in SBS (<i>p</i> > 0.05). Conclusion: CAD-CAM milled denture base resin showed higher SBS with pure denture reline. The addition of ZrO₂NPs decreased the SBS of reline with CAD-CAM milled denture base resins but did not change bond strength with 3D printed and conventional denture base resins.

Item Description

10.3390/dj12090275
2304-6767