A study to investigate and compare the physicomechanical properties of experimental and commercial temporary crown and bridge materials
| Autor: | S. Parker, Mangala P. Patel, Bana Abdulmohsen, Michael Braden |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Dental Stress Analysis
Absorption of water Materials science Denture Partial Three point flexural test Analytical chemistry 02 engineering and technology Methacrylate Polymerization Dental Materials 03 medical and health sciences 0302 clinical medicine Polymethacrylic Acids Flexural strength Elastic Modulus Temporary crown Desorption Materials Testing General Materials Science Solubility Composite material General Dentistry Crowns Plasticizer 030206 dentistry 021001 nanoscience & nanotechnology Dental Restoration Temporary Mechanics of Materials Methacrylates 0210 nano-technology |
| Zdroj: | Dental Materials. 32:200-210 |
| ISSN: | 0109-5641 |
| Popis: | To develop two experimental temporary crown and bridge materials with improved physicomechanical properties.Commercial materials: Trim (TR, monomethacrylate, Bosworth) and Quicktemp2 (QT, dimethacrylate, Schottlander).isobutyl methacrylate/poly(ethyl methacrylate) (IBMA/PEM) and n-butyl methacrylate/PEM (nBMA/PEM), both monomethacrylates. For water absorption/desorption studies rectangular samples (40 mm × 10 mm × 1 mm) of each material were prepared, immersed in deionized water (DW, control) and artificial saliva (AS), and weighed at regular time intervals. %solubility and diffusion coefficients (D) for uptake/loss processes were calculated and compared with theoretical predictions. Polymerization exotherm (cylindrical samples 10 mm × 18 mm) and flexural moduli were measured (three point bending; rectangular samples 80 mm × 10 mm × 4 mm, dry and after 9 days storage in DW). The data were compared statistically.QT and nBMA/PEM had lower %equilibrium uptakes/loss in DW (0.68%/0.884% and 0.64%/0.895% respectively). QT had the lowest water absorption/desorption D (P0.05) compared to the three monomethacrylates, in DW and AS. %solubility for all systems showed no differences in DW (P0.05), but a difference for QT in AS (P0.05). QT reached its maximum temperature rapidly (∼2 min; 3 monomethacrylates ∼7-13 min). The commercial materials exhibited high peak temperatures (∼51°C, P0.05; experimental materials ∼43°C). QT had a higher flexural modulus (∼4 GPa; 3 monomethacrylates ∼0.7-1 GPa) for dry and wet samples. The moduli for commercial materials reduced significantly after immersion in DW; there was no difference between the dry and wet experimental materials samples (P0.05).The experimental materials merit further studies since they presented with lower setting exotherms, and contained no phthalate plasticizer, thus being less of a risk to patients. |
| Databáze: | OpenAIRE |
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