Physical Property Investigation of Three Contemporary Glass Ionomer Restorative Materials
Abstract
Objective: To investigate the flexural properties and fracture toughness of two recently-marketed, high-viscosity conventional glass ionomer restorative materials compared to a contemporary product. Methods: Specimens (n=12) were fabricated for fracture toughness and flexure strength using standardized, stainless steel molds following manufacturer recommendations, placed in (WHAT %) phosphate buffered saline, and stored at 37 deg C until the appointed testing time. Specimens were tested to fracture in three-point bend mode at a rate of 0.5 mm/min on a universal testing machine Results were recorded in Newtons and values for flexural strength, modulus, and fracture toughness werecalculated with mean values recorded. Testing was accomplished at 24 hours, 1, 3 and 6 months after fabrication. Mean data was analyzed with Kruskal Wallis and Dunns post hoc test (alpha=0.05). Results: Physical properties were material dependent. While slight improvements in selected physical properties were noted between 24 hours and subsequent test points, most tests exhibited little difference between initial and final evaluation. Conclusions: Under the conditions of this study, select physical properties between the glass ionomers evaluated in this study showed a significant difference between the glass ionomers evaluated different time points with the following notable results. 1. Recently developed glass ionomers showed a significantly significant increase in flexural strength compared to Ketac Molar and no difference in fracture toughness at 6 months. 2. Although differences in GIC physical properties were noted, the divergences were of such small magnitude that it is unlikely that it would be of clinical significance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 21, 2018
- Accession Number
- AD1128300
Entities
People
- Joseph L. Gedge
Organizations
- Uniformed Services University of the Health Sciences