IADR Abstract Archives
Evaluation of Peel Bond Strength of Three Denture Base Resins to Soft Lining Materials Following Thermocycling
Objectives: The aim of this study was to evaluate the effect of thermocycling on the peel bond strength between three different denture base resins and two different soft liners.
Methods: The bonding between denture base materials (Eclipse=E, Lucitone-199=L, Paladent-20=P) and heat-cured soft-liners (Molloplast-B=M, Vertex-Soft=V) were evaluated. Peel specimens consisted of a denture base acrylic resin plate (75x10x3 mm) and soft liner (75x10x2 mm) that were bonded over 25 mm. All the materials tested were prepared and assigned to two groups (n=7): control and thermocycled (3000 cycles between 5oC-55oC). The maximum stress to cause rupture and the mode of failure were determined (N/mm). Results were statistically analyzed using Kolmogorov-Smirnov-Test, Kruskal-Wallis-Test and Mann-Whitney-U-Test (p=0,0001>0,01).
Results: In the peel test, group-PV produced the highest mean bond strength values both in thermocycled and control groups (PV:1.39N/mm; PV-t:1.49N/mm). Group-EV demonstrated the lowest mean peel bond strength values (EV:0.84N/mm, EV-t:0.64N/mm) and mostly adhesive failures.
Conclusions: The choice of soft liner material may enhance the service life of dentures. The results showed that, PMMA denture base materials presented similar bond strength values both with silicone and acrylic based soft liners. On the other hand, light curing denture base material showed better bond strength with silicone based soft liners compared to acrylic based soft liners. The results indicated that thermocycling didn’t make any significant difference in mean bond strength values.
Methods: The bonding between denture base materials (Eclipse=E, Lucitone-199=L, Paladent-20=P) and heat-cured soft-liners (Molloplast-B=M, Vertex-Soft=V) were evaluated. Peel specimens consisted of a denture base acrylic resin plate (75x10x3 mm) and soft liner (75x10x2 mm) that were bonded over 25 mm. All the materials tested were prepared and assigned to two groups (n=7): control and thermocycled (3000 cycles between 5oC-55oC). The maximum stress to cause rupture and the mode of failure were determined (N/mm). Results were statistically analyzed using Kolmogorov-Smirnov-Test, Kruskal-Wallis-Test and Mann-Whitney-U-Test (p=0,0001>0,01).
Results: In the peel test, group-PV produced the highest mean bond strength values both in thermocycled and control groups (PV:1.39N/mm; PV-t:1.49N/mm). Group-EV demonstrated the lowest mean peel bond strength values (EV:0.84N/mm, EV-t:0.64N/mm) and mostly adhesive failures.
Conclusions: The choice of soft liner material may enhance the service life of dentures. The results showed that, PMMA denture base materials presented similar bond strength values both with silicone and acrylic based soft liners. On the other hand, light curing denture base material showed better bond strength with silicone based soft liners compared to acrylic based soft liners. The results indicated that thermocycling didn’t make any significant difference in mean bond strength values.