Effect of Net Fiber Reinforcement Surface Treatment on Soft Denture Liner Retention and Longevity

• Published in: Journal of prosthodontics Vol. 19; no. 4; pp. 258 - 262
• Main Authors: Hatamleh, Muhanad M., Maryan, Christopher J., Silikas, Nick, Watts, David C.
• Format: Journal Article
• Language: English
• Published: Malden, USA Blackwell Publishing Inc 01.06.2010
• Subjects: Acrylic Resins; Analysis of Variance; Dental Bonding; Dental Stress Analysis; Denture Liners; Dimethylpolysiloxanes; Glass; glass fiber; Humans; Materials Testing; Molloplast-B; Shear Strength; Shear test; Silicone Elastomers; soft liner; Statistics, Nonparametric; Surface Properties; thermocycling
• ISSN: 1059-941X; 1532-849X; 1532-849X
• DOI: 10.1111/j.1532-849X.2009.00566.x

Purpose: To evaluate shear bond strength of Molloplast‐B soft liner attached to different acrylic surfaces (smooth, rough, and Sticktech net fiber‐reinforced interfaces) after 3000 thermal cycles. Materials and Methods: Sixty‐nine specimens were fabricated by attaching Molloplast‐B soft liner to acrylic bases of three interfaces (n= 23); smooth (Group 1, control), rough (Group 2), and Sticktech net fiber‐reinforced interface (Group 3). The specimens underwent 3000 thermocycles (5 and 55°C) before being subject to a shear bond test at 2 mm/min crosshead speed. Debonding sites were investigated using an optical microscope at 40× magnification. Bond failures were categorized as adhesive, cohesive, or mixed. Results: Mean (SD) bond strength values (MPa) were: 0.71 (0.15); 0.63 (0.07); and 0.83 (0.12) for smooth, rough, and fiber‐reinforced acrylic interfaces, respectively. The mean values were analyzed using one‐way ANOVA and Bonferroni post hoc test for pairwise comparisons (p≤ 0.05). The net fiber‐reinforced acrylic interface exhibited a statistically significantly higher bond strength value when compared to smooth and rough acrylic interfaces (P= 0.003 and P= 0.000, respectively). Modes of failure were mainly cohesive (91%), followed by mixed failures (9%). Conclusions: Molloplast‐B exhibited a stronger bond to StickTech Net fiber‐reinforced surfaces when compared to smooth and rough acrylic interfaces after thermocycling. This may enhance prosthesis serviceability during clinical use.