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The Effect of Lucite Glass Reinforcement on the Properties of Conventional Glass-Ionomer Filling Materials | ||
| Journal of Dentistry | ||
| مقاله 3، دوره 17، شماره 4، اسفند 2016، صفحه 309-317 اصل مقاله (1.29 M) | ||
| نوع مقاله: Original Article | ||
| نویسندگان | ||
| Haleh Kazemi Yazdi1؛ Richard Van Noort2؛ Mona Mansouri* 3 | ||
| 1Dept. of Restorative Dentistry, Dental Branch, Islamic Azad University, Tehran, Iran. | ||
| 2Academic Unit of Restorative Dentistry, University of Sheffield, Sheffield, UK. | ||
| 3Residence of Dept. Operative and Cosmetic Restorative, Dental Branch, Islamic Azad University, Tehran Branch, Tehran, Iran. | ||
| چکیده | ||
| Statement of the Problem: The usage of glass ionomer cements (GICs) restorative materials are very limited due to lack of flexural strength and toughness.Purpose: The aim of this study was to investigate the effect of using a leucite glass on a range of mechanical and optical properties of commercially available conventional glass ionomer cement.Materials and Method: Ball milled 45μm leucite glass particles were incorporated into commercial conventional GIC, Ketac-Molar Easymix (KMEm). The characteristics of the powder particles were observed under scanning electron microscopy. The samples were made for each experimental group; KMEm and lucite- modified Ketac-Molar easy Mix (LMKMEm) according to manufacturer’s instruction then were collected in damp tissue and stored in incubator for 1 hour. The samples were divided into two groups, one stored in distilled water for 24 hours and the others for 1 week.10 samples were made for testing biaxial flexural strength after 1 day and 1 week, with a crosshead speed of 1mm/min, calculated in MPa. The hardness (Vickers hardness tester) of each experimental group was also tested. To evaluate optical properties, 3 samples were made for each experimental group and evaluated with a spectrophotometer. The setting time of modified GIC was measured with Gillmore machine.Result: The setting time in LMKMEm was 8 minutes. The mean biaxial flexural strength was LMKMEm/ 1day: 24.13±4.14 MPa, LMKMEm/ 1 week: 24.22±4.87 MPa KMEm/1day:28.87±6.31 MPa and KMEm/1 week: 26.65±5.82 MPa which were not statistically different from each other. The mean Vickers hardness was LMKMEm: 403±66 Mpa and KMEm: 358±22 MPa; though not statistically different from each other. The mean total transmittance (Tt) was LMKMEm: 15.9±0.7, KMEm: 22.3±1.2, the mean diffuse transmittance (Td) was LMKMEm: 12.2±0.5, KMEm: 18.0±0.5 which were statistically different from each other.Conclusion: Leucite glass can be incorporated with a conventional GIC without interfering with setting time. Yet, it did not improve the mechanical and optical properties of the GIC. Keywords ● Dental material ● Glass Ionomer Cement ● Glass ● Mechanical Phenomena ● Optical Phenomena | ||
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