Selected physical properties of new resin-modified glass ionomer luting cements
| Autor: | Jason R. Garner, Nicholas DuVall, Howard W. Roberts, Michael Wajdowicz |
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| Rok vydání: | 2015 |
| Předmět: |
Dental Stress Analysis
Materials science Flexural modulus Glass ionomer cement Dental Cements Resin modified 030206 dentistry 02 engineering and technology In Vitro Techniques 021001 nanoscience & nanotechnology Composite Resins Physical property Resin Cements 03 medical and health sciences 0302 clinical medicine Fracture toughness Flexural strength Dental cement Glass Ionomer Cements Tensile Strength Ultimate tensile strength Oral Surgery Composite material 0210 nano-technology |
| Zdroj: | The Journal of prosthetic dentistry. 117(2) |
| ISSN: | 1097-6841 |
| Popis: | Statement of problem Two resin-modified glass ionomer (RMGI)-based luting agents have been recently marketed without independent reports of their physical properties. Purpose The purpose of this in vitro study was to evaluate selected physical properties of 2 newly marketed RMGI luting agents and compare the findings with traditional materials. Material and methods Specimens (N=12) of Nexus RMGI, UltraCem, GC Fuji Cem 2, and RelyX Luting Plus were fabricated using standardized molds for flexural strength and fracture toughness according to manufacturer recommendations and stored in physiologic phosphate-buffered saline solution at 37°C until testing. Specimens were tested at 1 and 24 hours, 1 week, and 1 month. Mean values for flexural strength, flexural modulus, flexural toughness, and fracture toughness were determined. Additionally, film thickness (N=12) for each material was determined following Amerian National Standards Association/American Dental Association (ANSI/ADA) specifications. Mean results were analyzed with Kruskal-Wallis and Mann-Whitney U tests (α=.05). Results All luting agents exhibited a similar film thickness that met ANSI/ADA requirements for aqueous-based luting agents. Nexus RMGI surprisingly demonstrated significantly greater flexural strength and fracture toughness at 1 hour, which decreased significantly at 24 hours, making it similar to the other materials evaluated. All materials had similar flexural strength values at 7 days. Conclusions Physical property performance was material dependent. Nexus RMGI demonstrated greater early physical properties that were significantly less at 24 hours. UltraCem, GC Fuji Cem 2, and RelyX Luting Plus demonstrated the increasing physical property development that is normally associated with polyalkenoate-based systems. |
| Databáze: | OpenAIRE |
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