Effect of surface treatment by phosphoric acid on the bond strength of an autopolymerized soft lining material to heat-polymerized and CAD-CAM acrylic resin denture bases.

Abstract

Abstract:

Purpose: The aim of study was to evaluate surface treatment effects by phosphoric acid application on the tensile bond strength (TBS) between autopolymerized silicone soft liner and CAD/CAM or conventional heat polymerized acrylic denture resins.

Method and Materials: This study included 32 rectangular specimens (40x10x10 mm) were distributed into four groups (n=8 for each group)  and they were prepared from CAD/CAM and conventional acrylic resins. Before relining with a direct soft liner, 16 specimens were surface-treated by phosphoric acid 37% and the remaining specimens served as control (no treatment). The TBS of denture liner to acrylic denture resins was tested by a testometric testing machine  at a 5 mm/min crosshead speed. The debonded surfaces were examined visually and by probe for the failure modes. ANOVA and multiple comparisons posthoc analysis tests were applied to determine the significant difference in TBS between the study groups (a = 0.05).

Results: There was no statistically significant difference in bond strength betw

Abstract:

Purpose: The aim of study was to evaluate surface treatment effects by phosphoric acid application on the tensile bond strength (TBS) between autopolymerized silicone soft liner and CAD/CAM or conventional heat polymerized acrylic denture resins.

Method and Materials: This study included 32 rectangular specimens (40x10x10 mm) were distributed into four groups (n=8 for each group)  and they were prepared from CAD/CAM and conventional acrylic resins. Before relining with a direct soft liner, 16 specimens were surface-treated by phosphoric acid 37% and the remaining specimens served as control (no treatment). The TBS of denture liner to acrylic denture resins was tested by a testometric testing machine  at a 5 mm/min crosshead speed. The debonded surfaces were examined visually and by probe for the failure modes. ANOVA and multiple comparisons posthoc analysis tests were applied to determine the significant difference in TBS between the study groups (a = 0.05).

Results: There was no statistically significant difference in bond strength between all groups (p > 0.05). and The type of failure of all specimens was adhesive.

Conclusion: This study revealed that surface treatment with Phosphoric acid 37%   does not increase TBS of direct silicone soft liner to acrylic resins.  TBS of conventional and CAD/CAM acrylic resins to a direct soft liner was not considerably different.

een all groups (p > 0.05). and The type of failure of all specimens was adhesive.

Conclusion: This study revealed that surface treatment with Phosphoric acid 37%   does not increase TBS of direct silicone soft liner to acrylic resins.  TBS of conventional and CAD/CAM acrylic resins to a direct soft liner was not considerably different.