Comparative Evaluation of Peel Bond Strength of Soft Liners to Laser-treated Denture Base Resins: An In Vitro Study

durable bond between soft liners and denture base materials is critical for their long-term clinical success. 8,9,11umerous surface modification methods have been investigated to enhance liner-denture base adhesion.Conventional techniques include mechanical roughening (alumina abrasion) and chemical conditioning using monomers such as methyl methacrylate (MMA), acetone, or methylene chloride.However, these methods often produce inconsistent outcomes and may compromise the physical or chemical integrity of the denture base. 9,11,14,15In recent years, advanced surface modification approaches, including plasma treatment and laser irradiation, have shown promising results. 9,14,16Particularly, Er, Cr:YSGG (Erbium, Chromium: Yttrium- IntroductIonEdentulism significantly compromises nutrition, systemic health, and quality of life, with nearly 30% of adults requiring removable prostheses for rehabilitation. 1,2Conventional polymethyl methacrylate (PMMA) remains the most widely used denture base material; however, its rigidity transmits functional stresses directly to the supporting tissues, often causing mucosal trauma, inflammation, and accelerated alveolar resorption. 3,4To overcome these limitations, polyamide resins have been explored as alternatives due to their improved esthetics, biocompatibility, and flexibility. 5Additionally, the introduction of resilient liners in the 1950s provided a breakthrough in denture therapy by offering cushioning, tissue conditioning, and enhanced patient comfort.Clinical reports suggest that more than 90% of edentulous patients found dentures lined with soft liners more comfortable than conventional bases. [6][7]][8][9] Resilient liners are broadly categorized into plasticized acrylic resins and silicone elastomers, available in autopolymerizing and heat-polymerizing forms. 8,10While acrylic-based materials such as Visco-gel are commonly used for short-term relining, silicone-based liners like Molloplast-B are preferred for long-term applications. [11][12]][13] Despite these advantages, one of the major drawbacks of soft liners is their inadequate adhesion to denture base resins, leading to delamination and clinical failure. [6][7][8]8][9]11 Adhesion failure not only reduces the service life of the prosthesis but also encourages bacterial colonization, plaque accumulation, water sorption, malodor, and denture stomatitis. [6][7]7][8][9] Therefore, establishing a