The Effect of Two Natural Oils on the Surface Hardness of Heat-Cured Acrylic Denture Base Material

著者

  • Nidhal Sahib Mansoor college of health and medical techniques
  • Rasha Mohammed Zwyyer

##semicolon##

https://doi.org/10.5195/d3000.2026.1513

##semicolon##

Prosthodontics##common.commaListSeparator## Tooth Loss##common.commaListSeparator## Crown##common.commaListSeparator## Dentures

要旨

Polymethyl methacrylate (PMMA) is the most widely used denture base material in prosthodontics due to its favorable mechanical properties, esthetic appearance, and cost-effectiveness. This study aimed to evaluate the effect of three different media insulating material (distilled water) as control, linseed oil (flaxseed oil), and lemon oil Heat-polymerized acrylic resin's surface-level hardness by comparing hardness values before and after immersion .Twenty-one rectangular acrylic resin samples (65mm × 10mm × 2.5mm) were fabricated using heat-cured PMMA and divided into three groups (n=7 each): Group A (control group) immersed in distilled water, group B (linseed oil), and group C (lemon oil). Surface hardness was measured using a Shore D durometer before and after two months of immersion at 37°C in an incubator. Data were statistically analyzed using one-way ANOVA and LSD post-hoc tests (p<0.05). Before immersion, group C (lemon oil) exhibited the highest mean hardness (83.829), followed by Group A (82.886) and Group B (82.386), with significant differences among groups (p=0.01). After two months, group B (linseed oil) showed the highest mean hardness (85.314), while no significant difference was found between linseed and lemon oil groups (p=0.236). The control group exhibited a slight decrease in hardness, whereas both oil-treated groups showed increased hardness after immersion. Immersion in natural oils, particularly linseed and lemon oils, effectively preserved or enhanced the hardness of polymerized resin compared to distilled water. Lemon oil improved initial hardness due to its terpene and limonene content, while linseed oil maintained superior long-term hardness due to its high concentration of unsaturated fatty acids and hydrophobic nature. These findings suggest that natural oils can protect acrylic resin from water-related softening and improve its durability. Future studies are recommended to optimize oil type, concentration, and clinical application methods.

##submission.downloads##

出版済

2026-08-14

巻号

巻 14 号 2 (2026)

セクション

Mechanisms of Oral Disease

##submission.license##

##submission.copyrightStatement##

##submission.license.cc.by4.footer##

Authors who publish with this journal agree to the following terms:

  1. The Author retains copyright in the Work, where the term “Work” shall include all digital objects that may result in subsequent electronic publication or distribution.
  2. Upon acceptance of the Work, the author shall grant to the Publisher the right of first publication of the Work.
  3. The Author shall grant to the Publisher and its agents the nonexclusive perpetual right and license to publish, archive, and make accessible the Work in whole or in part in all forms of media now or hereafter known under a Creative Commons Attribution 4.0 International License or its equivalent, which, for the avoidance of doubt, allows others to copy, distribute, and transmit the Work under the following conditions:
    1. Attribution—other users must attribute the Work in the manner specified by the author as indicated on the journal Web site;
    with the understanding that the above condition can be waived with permission from the Author and that where the Work or any of its elements is in the public domain under applicable law, that status is in no way affected by the license.
  4. The Author is able to enter into separate, additional contractual arrangements for the nonexclusive distribution of the journal's published version of the Work (e.g., post it to an institutional repository or publish it in a book), as long as there is provided in the document an acknowledgement of its initial publication in this journal.
  5. Authors are permitted and encouraged to post online a prepublication manuscript (but not the Publisher’s final formatted PDF version of the Work) in institutional repositories or on their Websites prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work. Any such posting made before acceptance and publication of the Work shall be updated upon publication to include a reference to the Publisher-assigned DOI (Digital Object Identifier) and a link to the online abstract for the final published Work in the Journal.
  6. Upon Publisher’s request, the Author agrees to furnish promptly to Publisher, at the Author’s own expense, written evidence of the permissions, licenses, and consents for use of third-party material included within the Work, except as determined by Publisher to be covered by the principles of Fair Use.
  7. The Author represents and warrants that:
    1. the Work is the Author’s original work;
    2. the Author has not transferred, and will not transfer, exclusive rights in the Work to any third party;
    3. the Work is not pending review or under consideration by another publisher;
    4. the Work has not previously been published;
    5. the Work contains no misrepresentation or infringement of the Work or property of other authors or third parties; and
    6. the Work contains no libel, invasion of privacy, or other unlawful matter.
  8. The Author agrees to indemnify and hold Publisher harmless from Author’s breach of the representations and warranties contained in Paragraph 6 above, as well as any claim or proceeding relating to Publisher’s use and publication of any content contained in the Work, including third-party content.

Revised 7/16/2018. Revision Description: Removed outdated link.