Effect of storage duration on tensile bond strength of acrylic or silicone-based soft denture liners to a processed denture base polymer.
OBJECTIVE
To investigate the effect of storage duration on the tensile bond strength of acrylic and silicone-based denture base materials with liners either heat-cured or auto-cured.


METHODS
The denture liners investigated were Vertex soft (acrylic-based, heat-cured), Coe soft (acrylic-based, auto-cured), Molloplast-B (silicone-based, heat-cured), and Mollosil plus (silicone-based, auto-cured). The soft liner specimens were 10 x 10 x 3 mm and were processed between two PMMA blocks. They were tested following immersion in water at 37 degrees C for 1 day, 1 week, and 1, 3, and 6 months. Tensile bond strength was measured using a universal testing machine (Testometric Micro 500) at a crosshead speed of 20 mm/min (n = 10 specimens per experimental group). Multiple ANOVA and Tukey HSD were used to analyse the data at a pre-set alpha of 0.05.


RESULTS
The results indicate that the tensile bond strength of acrylic-based soft liners is greater than that of silicone-based materials. The bond strength of all lining materials decreases with storage duration; the decrease being greatest for the acrylic-based soft liners. The decrease in bond strength of the auto-cured materials is greater than that of the heat-cured products.


CONCLUSIONS
Comparison of the materials in this study indicates that the silicone-based, heat-cured soft liner is superior, based on the tensile bond strength property. Use of silicone-based, heat-cured soft liners may provide better clinical success over a long period. These laboratory results need to be verified by clinical testing.
Meşe
Ayşe
A
Dicle University, Dental Faculty, Department of Prosthodontics, Diyarbakzr, Turkey. aysemese@yahoo.com
Güzel
Kahraman G
KG
Uysal
Ersin
E
D000180:Acrylic Resins / Q000737:chemistry*; D001840:Dental Bonding; D003819:Denture Bases; D003822:Denture Liners; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry*; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
D000180:Acrylic Resins; D004129:Dimethylpolysiloxanes; C020964:MDX 4-4210; D008689:Methacrylates; C483159:Mollosil Plus; D011108:Polymers; D012826:Silicone Elastomers; C076426:Vertex Soft; D014867:Water; C069457:Coe-Soft denture lining material; D019904:Polymethyl Methacrylate