Tensile Bond Strength Between UDMA Processed Record Base and Heat Cured PMMA
Abstract
Record bases are used to capture interocclusal records, set prosthetic teeth and have been shown to reduce overall error in the fabrication of removable complete dentures (RCDs). Record bases can be processed in poly-methyl methacrylate (PMMA) or urethane dimethacrylate (UDMA). Subsequently, teeth are attached to the record base using PMMA. UDMA has mechanical properties superior to PMMA but its chemical structure may preclude forming a reliable bond to PMMA. Objective: To compare the tensile bond strength (TBS) of UDMA to PMMA and PMMA to PMMA for RCD record base fabrication. Methods: Two groups consisted of 12 molded and light-cured half-dumbbell shaped UDMA specimens and 12molded and heat processed half-dumbbell shaped PMMA specimens. Surface treatment consisted of a solvent called wax remover for UDMA specimens and liquid monomer for PMMA specimens. All half specimens were placed in a plaster mold and PMMA was packed and heat processed to fabricate full-dumbbell shaped specimens (n=12). All manufacturers instructions were followed for specimen fabrication. Static load testing was conducted following International Organization for Standardization 11405 for TBS using a custom titanium jig on an MTS universal testing machine (5kN load/0.5mm/min crosshead speed). TBS was calculated over bonding surface area. Students t-test was used to compared the TBS between UDMA to PMMA group and PMMA to PMMA group. Results: Mean TBS for the UDMA to PMMA group was 20.386.48 MPa and PMMA to PMMA group was 55.51 7.74 MPa (p<0.001). Conclusion: PMMA had a significantly greater TBS compared to UDMA when bonded to processed PMMA.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 17, 2018
- Accession Number
- AD1128495
Entities
People
- Patrick E. Mccurdy
Organizations
- Uniformed Services University of the Health Sciences