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ORIGINAL ARTICLE
Year : 2014  |  Volume : 3  |  Issue : 2  |  Page : 102-106

Comparison and evaluation of tensile bond strength of two soft liners to the denture base resin with different surface textures: An in vitro study


1 Department of Prosthodontics, Meghana Institute of Dental Sciences, Nizamabad, Andhra Pradesh, India
2 Department of Prosthodontics, CKS Teja Institute of Dental Sciences, Tirupati, Andhra Pradesh, India

Correspondence Address:
Kuncha Venu Gopal
Department of Prosthodontics, Meghana Institute of Dental Sciences, Nizamabad, Andhra Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2277-8632.134850

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Introduction: Debonding of soft liners from the denture results in localized unhygienic conditions and often causes functional failure of the prosthesis. Aims: The purpose of this study is to evaluate and compare of the bond strength of the two permanent soft denture liners to a denture base resin with different surface preparations. Subjects and Methods: All the specimens were prepared by stainless steel dies which are duplicated and wax patterns were fabricated, which are then flasked and dewaxed. Heat cure denture base resin was mixed and trial packed into the mold. The specimens are recovered and divided into four sub-groups based on the surface to be prepared. The soft denture lining material, Super-soft (G.C. America Inc., USA) and Molloplast-B (Detax Gmbh and Co., KG, Germany) was packed and cured in between the two specimens. All the specimens were subjected to tension, until failure, in a Universal Testing Machine. Statistical Analysis Used: Analysis of variance using a Fischer's F test, unpaired t-test. Results: The tensile bond strengths of the four groups of both the soft liners were found to be very highly significant. The comparison between each group was made using a student's unpaired t-test for equality of means. It was found that when statistical analysis was made for Super-soft between group I and group II, group I and group IV the results were not significant whereas between group I and group III, group II and group III were strongly significant. The statistical analyses of the four groups of Molloplast-B soft liners were found to be very highly significant. Conclusions: Under the conditions of this in vitro study, conclusions were, sand papering the surface of the heat polymerized denture base resin increased the bond strength of the soft liner. Preparing holes on the surface of the denture base resin increases the bond strength because increase in the surface area and mechanical inter locking. Super-soft denture liner had the highest bond strength on all the surfaces than Molloplast-B.


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