Some mechanical properties of a highly cross-linked, microwave-polymerized, injection-molded denture base polymer

Memon, M.S.; Yunus, N.; Razak, A.A.A. (2001) Some mechanical properties of a highly cross-linked, microwave-polymerized, injection-molded denture base polymer. International Journal of Prosthodontics, 14 (3). pp. 214-218. ISSN 0893-2174

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      Purpose: The impact strength and the flexural properties of denture base materials are of importance in predicting their clinical performance upon sudden loading. This study compares the impact and transverse strengths and the flexural modulus of three denture base polymers. Materials and Methods: The investigation included a relatively new microwave-polymerized polyurethane-based denture material processed by an injection-molding technique, a conventional microwave-polymerized denture material, and a heat-polymerized compression-molded poly(methyl methacrylate) (PMMA) denture material. Impact strength was determined using a Charpy-type impact tester. The transverse strength and the flexural modulus were assessed with a three-point bending test. The results were subjected to statistical analysis using a one-way analysis of variance and the Scheffe test for comparison. Results: The impact strength of the microwave-polymerized injection-molded polymer was 6.3 kJ/m(2), while its flexural strength was 66.2 MPa. These values were lower than those shown by the two compression-molded PMMA-based polymers. The differences were statistically significant. The flexural modulus of the new denture material was 2,832 MPa, which was higher than the conventional heat-polymerized polymer but was comparable to the other microwave-polymerized PMMA-based polymer. The difference in the flexural modulus was statistically significant. Conclusion: In terms of the impact and flexural strengths, the new microwave-polymerized, injection-molded, polyurethane-based polymer offered no advantage over the existing heat- and microwave-polymerized PMMA-based denture base polymers. However, it has a rigidity comparable to that of the m microwave-polymerized PMMA polymer.

      Item Type: Article
      1. Memon, M.S.
      2. Yunus, N.
      3. Razak, A.A.A.
      Journal or Publication Title: International Journal of Prosthodontics
      Additional Information: ISI Document Delivery No.: 436BK Times Cited: 17 Cited Reference Count: 23 Cited References: ALDOORI D, 1988, DENT MATER, V4, P25 Alkhatib M B, 1990, Int J Prosthodont, V3, P249 ALMULLA MAS, 1988, DENT MATER, V4, P197, DOI 10.1016/S0109-5641(88)80064-2 ANDERSON GC, 1988, J PROSTHET DENT, V60, P394, DOI 10.1016/0022-3913(88)90292-2 Berrong J M, 1990, Int J Prosthodont, V3, P391 BRADEN M, 1988, BRIT DENT J, V164, P109, DOI 10.1038/sj.bdj.4806373 CALLITTU PK, 2000, INT J PROSTHODONT, V13, P334 Jerolimov V, 1985, Quintessence Dent Technol, V9, P431 KIMURA H, 1983, J JPN SOC DENT APPAR, V2, P253 Nishii M, 1968, J Osaka Dent Univ, V2, P23 ROBINSON JG, 1993, DENT MATER, V9, P355, DOI 10.1016/0109-5641(93)90056-V RUYTER IE, 1980, J PROSTHET DENT, V43, P95, DOI 10.1016/0022-3913(80)90362-5 RUYTER IE, 1986, DENT MATER, V2, P6, DOI 10.1016/S0109-5641(86)80062-8 SALIM S, 1992, J PROSTHET DENT, V67, P879, DOI 10.1016/0022-3913(92)90606-B SOLNIT GS, 1991, J PROSTHET DENT, V66, P310, DOI 10.1016/0022-3913(91)90255-U STAFFORD GD, 1980, J DENT, V8, P292, DOI 10.1016/0300-5712(80)90043-3 Vallittu PK, 1999, J PROSTHET DENT, V81, P318, DOI 10.1016/S0022-3913(99)70276-3 Vallittu P K, 1997, Quintessence Int, V28, P39 Vallittu PK, 1998, EUR J ORAL SCI, V106, P588, DOI 10.1046/j.0909-8836.1998.eos106109.x Vallittu PK, 1997, INT J PROSTHODONT, V10, P142 WHITING R, 1980, J DENT RES, V59, P55, DOI 10.1177/00220345800590010801 Zissis AJ, 2000, INT J PROSTHODONT, V13, P136 Anonymous, 1998, ISO 1567 for denture base polymers Memon, MS Yunus, N Razak, AAA Quintessence publ co inc Carol stream
      Uncontrolled Keywords: Acrylic resin poly(methyl methacrylate) flexural properties impact strength glass-fibers
      Subjects: R Medicine > RK Dentistry
      Divisions: Faculty of Dentistry > Dept of Conservative Dentistry
      Depositing User: Mr Ahmad Azwan Azman
      Date Deposited: 25 Oct 2012 10:14
      Last Modified: 25 Oct 2012 10:14

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