IADR Abstract Archives
Bond Strength Between Modern Denture Base Acrylics and Reline Materials
Objectives: To evaluate the tensile bond strength of three soft denture-reline materials, bonded to three types of polymethyl methacryclate (PMMA) denture base materials.
Methods: Three soft denture-reline materials (Ufi Gel SC; Silagum-Comfort; Vertex Soft) were used to reline each denture base PMMA. A heat-cured PMMA (Vertex Rapid Simplified), a self-cured PMMA (Vertex Self-Curing), and a CAD/CAM PMMA (IvoBase CAD) was used for the study. Following manufactures’ instructions, testing specimens were prepared for each reline material and each denture base acrylic to create nine test groups. A layer of reline material (3mm thickness) was used to reline between two 10mm x 10mm x 20mm acrylic rectangular cuboids(n = 10). Prior to testing, half of the specimens for each test group were thermocycled. The specimens were then brought to failure in tension, using a universal testing machine. Modes of failure was assessed using light microscopy and scanning electron microscopy. Statistical analysis was performed using mixed (multiple) linear regression, one-way ANOVA, Tukey Post Hoc test, and Kruskal Wallis test.
Results: The mean tensile bond strength results ranged from 0.36 MPa (± 0.13) to 1.51 MPa (±0.46). The CAD/CAM denture base materials showed the lowest range of bond strength to soft reline materials (0.36 - 0.42MPa). There was no statistically significant difference (p= 0.74) between any of the thermocycled (0.71 MPa ± 0.23) and non-thermocycled groups (0.74 MPa ± 0.21). All three types of modes of failures (adhesive, cohesive, and mixed mode) were observed.
Conclusions: Silicone based soft reline materials produced the highest tensile bond strength to all denture bases. Soft liners bonded to CAD/CAM denture bases produced the weakest tensile bond strengths. Thermocycling did not produce statistically significant results on the tensile bond strength of the soft-liners to the denture base resins.
Methods: Three soft denture-reline materials (Ufi Gel SC; Silagum-Comfort; Vertex Soft) were used to reline each denture base PMMA. A heat-cured PMMA (Vertex Rapid Simplified), a self-cured PMMA (Vertex Self-Curing), and a CAD/CAM PMMA (IvoBase CAD) was used for the study. Following manufactures’ instructions, testing specimens were prepared for each reline material and each denture base acrylic to create nine test groups. A layer of reline material (3mm thickness) was used to reline between two 10mm x 10mm x 20mm acrylic rectangular cuboids(n = 10). Prior to testing, half of the specimens for each test group were thermocycled. The specimens were then brought to failure in tension, using a universal testing machine. Modes of failure was assessed using light microscopy and scanning electron microscopy. Statistical analysis was performed using mixed (multiple) linear regression, one-way ANOVA, Tukey Post Hoc test, and Kruskal Wallis test.
Results: The mean tensile bond strength results ranged from 0.36 MPa (± 0.13) to 1.51 MPa (±0.46). The CAD/CAM denture base materials showed the lowest range of bond strength to soft reline materials (0.36 - 0.42MPa). There was no statistically significant difference (p= 0.74) between any of the thermocycled (0.71 MPa ± 0.23) and non-thermocycled groups (0.74 MPa ± 0.21). All three types of modes of failures (adhesive, cohesive, and mixed mode) were observed.
Conclusions: Silicone based soft reline materials produced the highest tensile bond strength to all denture bases. Soft liners bonded to CAD/CAM denture bases produced the weakest tensile bond strengths. Thermocycling did not produce statistically significant results on the tensile bond strength of the soft-liners to the denture base resins.