4. Effect of Two Different Impression Materials in Recording Mean Retention Bases on Heat Cure Acrylic Resins
Effect of Two Different Impression Materials in Recording Mean Retention Bases on Heat Cure Acrylic Resins
Shahnila Sharif1, Hina Memon1, Nizam uddin Buriro1, Naseem Shaikh1, Uzma Bashir2 and Muhammad Rizwan Memon2
ABSTRACT
Objective: This study was undertaken to compare the forces of retention for maxillary polymethyl methacrylate denture bases fabricated by using single step low fusing green stick compound ( Group 1) and single step border moulding using addition silicone (putty) impression material ( group 2 ).
Study Design: Randomised control trial study
Place and Duration of Study: This study was conducted at the Department of Prosthodontics, Institute of Dentistry Liaquat University of medical and health science Jamshoro from April to September 2021.
Methods: A sample of 90 edentulous patients, 45 in each group with age group 40-60 yrs, both genders were included in this study. Retention values of customised heat cure acrylic denture bases ( Group 1 border moulded with green stick compound and Group II - border molded with addition silicone putty impression material ) were recorded using digital force gauge machine company attached to wire loop at the center anterior part of each plate. Definitive wash impression were made with light body addition silicone for both groups.
Results: The average age of the patients was 51.27±5.4 years. There were 44(48.9%) male and 46(51.1%) female. Mean retention was found to be higher in group 2 (addition silicone : 32.75±6.78 ) as compared to group 1 ( green stick compound : 29.94±10.89; p=0.0005].
Conclusion: It was concluded that the heavy bodied addition silicone is a better material for border moulding as compared to low fusing green stick impression compound.
Key Words: Complete dentures, addition silicone, green stick compound, border moulding materials