Effect of titanium dioxide nanoparticle addition into orthodontic adhesive resin on enamel microhardness

[摘要] White spots are an early sign of enamel demineralization, which may lead to development of dental caries. Enamel demineralization can be determined by examining the microhardness number of the enamel. Addition of antibacterial agents such as TiO2nanoparticles into the orthodontic adhesive (TiO2nanocomposite) is expected to prevent enamel demineralization. The objective of this study is to evaluate the effect of TiO2nanocomposites in maintaining enamel microhardness around orthodontic brackets. The bracket was bonded to the premolar using Transbond XT (group 1), 1% TiO2nanocomposites (group 2), and 2% TiO2nanocomposites (group 3). Group 4 was the control group, and it was not given any treatment prior to the microhardness test. The samples of groups 1, 2, and 3 were soaked in BHI solution containing Streptococcus mutans, and then stored in an incubator at 37°C for 30 days. Demineralizations were determined on cross-sectioned tooth 100μm and 200μm cervical to the bracket by the Vickers microhardness test. The microhardness values were significantly different between every group, with the highest value obtained for control group, followed by the 2% TiO2nanocomposite group, 1% TiO2nanocomposite group, and then the Transbond XT group. The results of this study reveal that 2% TiO2 nanocomposites have the ability to maintain enamel microhardness around the orthodontic bracket.

[发布机构] Department of Orthodontics, Faculty of Dentistry, Universitas Indonesia, Jakarta, Indonesia^1

[效力级别] 医药卫生 [学科分类] 卫生学

[关键词] Enamel demineralization;Enamel microhardness;Microhardness tests;Orthodontic adhesive;Orthodontic brackets;Streptococcus mutans;Titanium dioxide nanoparticles;Vickers microhardness tests