An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymers
Statement of Problem: Acrylic resins have been in the center stage of Prosthodontics for more than half a century. The flexural fatigue failure of denture base materials is the primary mode of clinical failure. Hence there is a need for superior physical and mechanical properties. Purpose: This in...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2013-01-01
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| Series: | Indian Journal of Dental Research |
| Subjects: | |
| Online Access: | http://www.ijdr.in/article.asp?issn=0970-9290;year=2013;volume=24;issue=3;spage=356;epage=362;aulast=Raut |
| _version_ | 1818991687965343744 |
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| author | Anjana Raut Polsani Laxman Rao BVJ Vikas T Ravindranath Archana Paradkar G Malakondaiah |
| author_facet | Anjana Raut Polsani Laxman Rao BVJ Vikas T Ravindranath Archana Paradkar G Malakondaiah |
| author_sort | Anjana Raut |
| collection | DOAJ |
| description | Statement of Problem: Acrylic resins have been in the center stage of Prosthodontics for more than half a century. The flexural fatigue failure of denture base materials is the primary mode of clinical failure. Hence there is a need for superior physical and mechanical properties.
Purpose: This in vitro study compared the transverse strength of specimens of thermopressed injection-molded and conventional compression-molded polymethylmethacrylate polymers and examined the morphology and microstructure of fractured acrylic specimens.
Materials and Methods: The following denture base resins were examined: Brecrystal (Thermopressed injection-molded, modified polymethylmethacrylate) and Pyrax (compression molded, control group). Specimens of each material were tested according to the American Society for Testing and Materials standard D790-03 for flexural strength testing of reinforced plastics and subsequently examined under SEM. The data was analyzed with Student unpaired t test.
Results: Flexural strength of Brecrystal (82.08 ± 1.27 MPa) was significantly higher than Pyrax (72.76 ± 0.97 MPa). The tested denture base materials fulfilled the requirements regarding flexural strength (>65 MPa). The scanning electron microscopy image of Brecrystal revealed a ductile fracture with crazing. The fracture pattern of control group specimens exhibited poorly defined crystallographic planes with a high degree of disorganization.
Conclusion: Flexural strength of Brecrystal was significantly higher than the control group. Brecrystal showed a higher mean transverse strength value of 82.08 ± 1.27 MPa and a more homogenous pattern at microscopic level. Based on flexural strength properties and handling characteristics, Brecrystal may prove to be an useful alternative to conventional denture base resins. |
| first_indexed | 2024-12-20T20:14:14Z |
| format | Article |
| id | doaj.art-588f11e83eac4bbda9cadf4c3e90230a |
| institution | Directory Open Access Journal |
| issn | 0970-9290 1998-3603 |
| language | English |
| last_indexed | 2024-12-20T20:14:14Z |
| publishDate | 2013-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Indian Journal of Dental Research |
| spelling | doaj.art-588f11e83eac4bbda9cadf4c3e90230a2022-12-21T19:27:46ZengWolters Kluwer Medknow PublicationsIndian Journal of Dental Research0970-92901998-36032013-01-0124335636210.4103/0970-9290.118006An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymersAnjana RautPolsani Laxman RaoBVJ VikasT RavindranathArchana ParadkarG MalakondaiahStatement of Problem: Acrylic resins have been in the center stage of Prosthodontics for more than half a century. The flexural fatigue failure of denture base materials is the primary mode of clinical failure. Hence there is a need for superior physical and mechanical properties. Purpose: This in vitro study compared the transverse strength of specimens of thermopressed injection-molded and conventional compression-molded polymethylmethacrylate polymers and examined the morphology and microstructure of fractured acrylic specimens. Materials and Methods: The following denture base resins were examined: Brecrystal (Thermopressed injection-molded, modified polymethylmethacrylate) and Pyrax (compression molded, control group). Specimens of each material were tested according to the American Society for Testing and Materials standard D790-03 for flexural strength testing of reinforced plastics and subsequently examined under SEM. The data was analyzed with Student unpaired t test. Results: Flexural strength of Brecrystal (82.08 ± 1.27 MPa) was significantly higher than Pyrax (72.76 ± 0.97 MPa). The tested denture base materials fulfilled the requirements regarding flexural strength (>65 MPa). The scanning electron microscopy image of Brecrystal revealed a ductile fracture with crazing. The fracture pattern of control group specimens exhibited poorly defined crystallographic planes with a high degree of disorganization. Conclusion: Flexural strength of Brecrystal was significantly higher than the control group. Brecrystal showed a higher mean transverse strength value of 82.08 ± 1.27 MPa and a more homogenous pattern at microscopic level. Based on flexural strength properties and handling characteristics, Brecrystal may prove to be an useful alternative to conventional denture base resins.http://www.ijdr.in/article.asp?issn=0970-9290;year=2013;volume=24;issue=3;spage=356;epage=362;aulast=RautCrazingductile fractureflexural strengthinjection molding |
| spellingShingle | Anjana Raut Polsani Laxman Rao BVJ Vikas T Ravindranath Archana Paradkar G Malakondaiah An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymers Indian Journal of Dental Research Crazing ductile fracture flexural strength injection molding |
| title | An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymers |
| title_full | An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymers |
| title_fullStr | An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymers |
| title_full_unstemmed | An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymers |
| title_short | An in vitro study to compare the transverse strength of thermopressed and conventional compression-molded polymethylmethacrylate polymers |
| title_sort | in vitro study to compare the transverse strength of thermopressed and conventional compression molded polymethylmethacrylate polymers |
| topic | Crazing ductile fracture flexural strength injection molding |
| url | http://www.ijdr.in/article.asp?issn=0970-9290;year=2013;volume=24;issue=3;spage=356;epage=362;aulast=Raut |
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