Chow-Ming Tan1, James Kit-Hon Tsoi2, Chaminda Jayampath Seneviratne3, Jukka Pekka Matinlinna1. 1. Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, P.R. China. 2. Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, P.R. China. Electronic address: jkhtsoi@hku.hk. 3. Oral Sciences, Faculty of Dentistry, National University of Singapore, Singapore, Singapore.
Abstract
PURPOSE: To investigate the effects of using a low-cost powered toothbrush for cleaning on dental prostheses made of heat polymerized poly(methyl methacrylate), PMMA. METHODS: Heat cured PMMA specimens beam with the dimensions of 45.0 mm×6.5 mm×4.5mm were fabricated. The specimens were kept in water storage at 37 °C constant temperature for 0, 1, 7, 15, 30 and 60 days and randomly assigned for testing or control. Test specimens underwent brushing by using a powered toothbrush at an applied force of 2.00 N for 22 min with water as medium. Surface roughness measurement (Ra), flexural strength and efficacy of brushing to remove coated Candida albicans biofilm were investigated. RESULTS: The results of the mean surface roughness value and the flexural strength were analysed by using two-way ANOVA and Tukey post hoc test at 5% significance level. In general, the specimens showed no significant changes in flexural strength after brushing. However, the flexural strength and the surface roughness value were significantly lower in specimens group after 7 days in water storage compared to the control. SEM micrographs of post-brushed specimens revealed satisfactory removal of C. albicans biofilm. CONCLUSION: A low-cost powered toothbrush together with a liquid medium successfully removed C. albicans biofilm on dental acrylic PMMA-based prostheses, without compromising the mechanical properties.
PURPOSE: To investigate the effects of using a low-cost powered toothbrush for cleaning on dental prostheses made of heat polymerized poly(methyl methacrylate), PMMA. METHODS: Heat cured PMMA specimens beam with the dimensions of 45.0 mm×6.5 mm×4.5mm were fabricated. The specimens were kept in water storage at 37 °C constant temperature for 0, 1, 7, 15, 30 and 60 days and randomly assigned for testing or control. Test specimens underwent brushing by using a powered toothbrush at an applied force of 2.00 N for 22 min with water as medium. Surface roughness measurement (Ra), flexural strength and efficacy of brushing to remove coated Candida albicans biofilm were investigated. RESULTS: The results of the mean surface roughness value and the flexural strength were analysed by using two-way ANOVA and Tukey post hoc test at 5% significance level. In general, the specimens showed no significant changes in flexural strength after brushing. However, the flexural strength and the surface roughness value were significantly lower in specimens group after 7 days in water storage compared to the control. SEM micrographs of post-brushed specimens revealed satisfactory removal of C. albicans biofilm. CONCLUSION: A low-cost powered toothbrush together with a liquid medium successfully removed C. albicans biofilm on dental acrylic PMMA-based prostheses, without compromising the mechanical properties.
Authors: Hao Ding; Yunzhen Yang; Xin Li; Gary Shun-Pan Cheung; Jukka Pekka Matinlinna; Michael Burrow; James Kit-Hon Tsoi Journal: Biomater Investig Dent Date: 2022-08-31
Authors: Petrus L B Madeira; Letícia T Carvalho; Marco A B Paschoal; Eduardo M de Sousa; Eduardo B Moffa; Marcos A Dos Santos da Silva; Rudys de Jesus Rodolfo Tavarez; Letícia M Gonçalves Journal: Front Cell Infect Microbiol Date: 2016-06-28 Impact factor: 5.293