Comparison of the Effect of two Denture Cleansers on Tensile bond Strength of a Denture Liner

Statement of problem: one of the most clinical challenging issues in prosthodontics is debonding of soft liners from the denture base.purpose: the aim of this study was to evaluate and compare tensile bond strength betweensoft liner and heat-cured acrylic resin when immersed in two different types of denture cleanser and distilled water, at different period of times.materials and method: in this experimental in vivo study, 238 heat-cured acrylic blockswere made. a soft liner was embedded between the acrylic blocks. samples were dividedinto four groups: 17 samples were in the control group and were not soaked in any solution.the remaining samples were divided into 3 groups (distilled water, calgon and fittydent).each group was then subdivided into two subcategories, regarding the immersion timevariable; 15 and 45 minutes. all samples were placed in tension force and tensile bondstrength was recorded with the testing machine. one- way anova and tucky hsd posthoctest were adopted to analyze the yielded data (α> 0.05).results: specimens which were immersed in two denture cleansers (fittydent and calgon)and in distilled water showed significant difference (p= 0.001) in bonding strength when compared to the control group. the subjects immersed in denture cleanser solutions and distilled water did not reveal any significant difference (p= 0.90). for all groups; most of the bonding failures (72%) were cohesive type.conclusion: the effect of the denture cleansers and distilled water on the bond strengthwas not statistically different; however, the difference was significant between the immersedgroups with the non-immersed group. moreover, type of the denture cleanser didnot show any effect on the tensile strength. the tensile strength increases with time ofimmersion.