Evaluation of shear bond strength of silicon-based soft liner to the acrylic resin denture base using different polymerization technique with different storage periods in distilled water

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Thikra M. Hachim,


Background: This study was to investigate the effect of different polymerization techniques of denture base
(conventional heat cure acrylic and visible light cure acrylic) and storage duration on shear bond strength of siliconbased
soft lining material.
Materials and methods: The soft liner investigated was a silicon-based autocured (Ufi Gel P). The soft liners were
processed according to manufacturers instruction. The resilient liner specimens for shear bond strength testing were
25 ´ 25 ´ 3 mm and were processed between two acrylic blocks (size of each block (75x25x5mm). A total of 40
specimens were fabricated, 20 specimens for each type of denture base specimens were stored for 1 day, 1 week,
1 month and 3 months in distilled water at 37 degree oC (n=5).
Bond strength was measured by instron testing machine at cross head speed 5mm/min until fracture. ANOVA with
multiple comparisons LSD test and student t-test were used to analyze the data (the mean difference is significant at
the 0.05)
Results: The result indicated that type of denture based affect the bond strength of soft lining material and the shear
bond strength of lining material decrease with storage duration (for both groups).
Conclusion: Within the limitations of this in Vitro study: Ufi Gel P exhibited as significant higher bond strength to heat
cured acrylic denture base when compared to visible light cure acrylic resin. Water storage for 1 month and 3 month
result in significant decrease in shear bond strength of Ufi Gel P soft liner to a heat cured and Visible light cured
denture base.

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Restorative Dentistry