Evaluation of Surface hardness of Denture Base Acrylic Resin Modified with Different Techniques
| Autor: | Inas A.M. Jawad, Ammar A. Al-Hamdani, Rizgar M. A. Hasan |
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| Jazyk: | Arabic<br />English |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Al-Rafidain Dental Journal, Vol 23, Iss 2, Pp 284-297 (2023) |
| Druh dokumentu: | article |
| ISSN: | 1812-1217 1998-0345 |
| DOI: | 10.33899/rdenj.2023.133348.1160 |
| Popis: | Aims: Evaluation of the surface hardness of heat-treated acrylic resin after modifying it with three different techniques. Materials and Methods: Heat cured acrylic resin was modified by: (a) The copolymerization of acrylic resin with 5% and 10% of acrylic acid (AA), (b) The addition of 5% and 10% thermally activated zinc oxide (ZnO) and (c) The chemical bonding or engagement of Zinc ions into the polymer chain by an organic link, zinc diacrylate (ZDA) in 5% and 10%, to get a copolymer. The acrylic specimens have dimensions of (30, 15 and 3) ± 0.2 mm. Surface hardness was determined using a Durometer (Shore D) hardness tester. Results: There was general increase of the surface hardness of the experimental (modified) groups. A statical significant increase in the hardness of both acrylic groups modified by 10% ZnO and 10% ZDA compared to the control group and the remaining modified samples. Conclusion: Two techniques had significantly improved the hardness of heat cured acrylic resin; either by adding 10% by weight of thermally activated ZnO or by copolymerizing it with 10% by weight of ZDA to get poly (methyl methacrylate -co-zinc acrylate) copolymer. |
| Databáze: | Directory of Open Access Journals |
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