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Self‐cleaning effects of acrylic resin containing fluoridated apatite‐coated titanium dioxide
Author(s) -
Sawada Tomofumi,
Sawada Tomoji,
Kumasaka Tomonari,
Hamada Nobushiro,
Shibata Takeshi,
ami Toru,
Kimoto Katsuhiko
Publication year - 2014
Publication title -
gerodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 54
eISSN - 1741-2358
pISSN - 0734-0664
DOI - 10.1111/ger.12052
Subject(s) - acrylic resin , titanium dioxide , dentures , photocatalysis , flexural strength , materials science , titanium , composite material , apatite , nuclear chemistry , dentistry , medicine , chemical engineering , coating , chemistry , organic chemistry , metallurgy , catalysis , engineering
Objectives Specific materials when used in the manufacture of dentures can enhance the elimination of micro‐organisms to promote oral hygiene. We used Candida albicans adhesion assays, methylene blue ( MB )‐decomposition tests and mechanical property tests to evaluate the photocatalytic properties of acrylic resin containing fluoridated apatite‐coated titanium dioxide ( FA p‐TiO 2 ) after treatment with ultraviolet A ( UVA ) irradiation. Background Conventional denture cleaning methods are unable to completely eliminate micro‐organisms from dentures. Materials and methods Test specimens were prepared using acrylic resin containing three types of TiO 2 powder [ FA p‐TiO 2, titanium dioxide (TiO 2 ) and hydroxyapatite‐coated TiO 2 ( HA p‐TiO 2 )]; n = 96. In the adhesion assay, test specimens were incubated in a fungal suspension and subjected to UVA irradiation, and the number of attachments of C. albicans on the test specimens was counted. The MB ‐decomposition test and the three‐point bending test were then performed to assess the photocatalytic effects of the FA p‐TiO 2 ‐containing acrylic resin. Results Fluoridated apatite‐coated titanium dioxide‐containing acrylic resin demonstrated superior effectiveness in inhibiting C. albicans adherence as well as in decomposing MB . In the three‐point bending test, the resin showed a smaller decrease in flexural strength compared with TiO 2 ‐ or HA p‐TiO 2 ‐containing acrylic resin. Furthermore, UVA irradiation for 360 h did not significantly influence its flexural strength or elasticity modulus as compared with the control; this fulfils the requirements of International Organization for Standardization 1567:1999. Conclusion Fluoridated apatite‐coated titanium dioxide‐containing acrylic resin is a clinically suitable material that promotes proper denture hygiene, particularly for elderly persons requiring nursing care or who have a decreased ability to perform normal activities of daily living.