Evaluation of the Bond Strength of Three Soft Lining Materials to Acrylic Resin Denture Base

Aims: The aims of this study were to evaluate the effect of different surface treatments and different periods of water storage on tensile bond strength of three soft lining materials. Materials and methods: Two hundred sixty four (264) specimens have been prepared. Surface treatments used for bonding Molloplast – B liner included roughening acrylic surface with bur, and treatment with primo adhesive. For bonding Bony plus liner, roughening acrylic surface with bur, treatment with liner’s liquid and combination of both treatments have been evaluated. For GC Reline liner, roughening acrylic surface with bur has been evaluated.Befor tensile bond testing of molloplast-B liner’s specimens they were stored for(1 day or 1 month or 4 months), while Bony plus and GC Reline liners’specimenes were stored for(1 day or 1 week or 1 month) and then tested. Results: The results showed that roughening acrylic surface had an insignificant effect on (TBS) of GC Reline liner and Bony plus liner (although these materials showed cohesive failure). Bony plus liner’s liquid treatments had significant improvement in (TBS) of this liner. Different periods of water storage had insignificant effect on (TBS) of Molloplast-B liner and GC Reline liner, but (TBS) of Bony plus liner showed significant increasing after 1month water storage. Conclusion: From the results of this study we can concluded that surface treatment to acrylic base improved tensile bond strength of soft lining material ,and the effect of water storage on bond strength differed with different types of soft lining materials. Key word: soft liner, bond strength, denture base Kazanji MN, Abid Al-Kadder AA. Evaluation of the Bond Strength of Three Soft Lining Materials to Acrylic Resin Denture Base. Al–Rafidain Dent J. 2012; 12(1): 57-65. Received: 17/12/2006 Sent to Referees: 17/12/2006 Accepted for Publication: 20/10/2010 INTRODUCTION Soft lining materials are indicated in a variety of circumstances, but most commonly where the oral mucosa covering the denture–bearing area is locally or generally of inadequate thickness, or where the oral mucosa exhibits a reduced tolerance to the loads applied to it by the denture. (1) In addition, patients with persistent denture--sore mouth are not willing to leave their dentures out of the mouth for any length of time. (2) This can be corrected and the tissues can be returned to health by the use of tissue conditioning materials. (3) Evaluation of the Bond Strength of Three Soft Lining Materials to Acrylic Resin Denture Base ISSN: 1812–1217 www.rafidaindentj.net Al – Rafidain Dent J