EFFECTS OF VARIOUS SURFACE TREATMENTS OF HEAT CURE POLYMETHYL METHACRYLATE DENTURE BASES ON THE TENSILE BOND STRENGTH OF SOFT LINERS

* Senior Lecturer, Department of Prosthodontics, Kothiwal Dental College & Research Centre, Moradabad, Uttar Pradesh, India ** MDS, Consultant Prosthodontist, Ruby Hall, Inlaks & Budhrani Hospital, Pune, India *** Professor, Department of Prosthodontics. Dr. D.Y Patil Dental College & Hospital, Pimpri, Pune, India † Reader, Department of Periodontics, Maharaja Ganga Singh Dental College & Research Centre, Sri Ganganagar, Rajasthan, India †† Lecturer, Department of Oral & Maxillofacial Surgery, Institute of Dental Sciences, Bareilly, Uttar Pradesh, India _________________________________________________________________________ ABSTRACT Aim: The aim of this study was to determine the bond strength of two soft liners to Heat cure poly methyl methacrylate denture base resins by various surface preparation of resin. Materials and Methods: GC Reline soft and soft liner (GC Corporation, Tokyo, Japan) a permanent self cure denture soft lining materials were used in this study. Specimens were prepared by stainless steel dies of 40 mm length, 10 mm wide, 10 mm and a cross sectional area of 10mm x 10mm. The specimen categorized in 2 groups along with 5 subgroups. Results: Statistical analysis done was ANOVA and Student ‘t’ test. Bond strength was measured by universal testing machine. Significant difference was found in bond strength of silicon and acrylic including its subgroups. Conclusion: From the above study it can be concluded that highest bond strength was seen in the Acrylic group. In matter of best physical surface treatment Silicone group showed Sand papering was better than Sand blasting. In respect to chemical surface treatment, silicone group showed that application of Acetone was better than Methyl Methacrylate. Best combination was seen in the Polymethyl methacrylate to Acrylic soft liner after the Polymethyl methacrylate was treated with Methyl Methacrylate.