Influence of masticating cycles and chewing patterns on inadvertent enamel wear caused by zirconia brackets
Corresponding Author
Yasuhiro Namura
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Correspondence
Yasuhiro Namura, Department of Orthodontics, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda-ku, Tokyo 101–8310, Japan.
Email: [email protected]
Search for more papers by this authorYasuki Uchida
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorMizuki Inaba
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorRyo Kaetsu
Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry, Tokyo, Japan
Search for more papers by this authorAkihisa Utsu
Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry, Tokyo, Japan
Search for more papers by this authorToshiki Takamizawa
Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
Division of Biomaterials Science, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorMasashi Miyazaki
Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
Division of Biomaterials Science, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorMitsuru Motoyoshi
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorCorresponding Author
Yasuhiro Namura
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Correspondence
Yasuhiro Namura, Department of Orthodontics, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda-ku, Tokyo 101–8310, Japan.
Email: [email protected]
Search for more papers by this authorYasuki Uchida
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorMizuki Inaba
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorRyo Kaetsu
Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry, Tokyo, Japan
Search for more papers by this authorAkihisa Utsu
Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry, Tokyo, Japan
Search for more papers by this authorToshiki Takamizawa
Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
Division of Biomaterials Science, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorMasashi Miyazaki
Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
Division of Biomaterials Science, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorMitsuru Motoyoshi
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Division of Clinical Research, Dental Research Centre, Nihon University School of Dentistry, Tokyo, Japan
Search for more papers by this authorAbstract
Little information is available about enamel wear caused by zirconia brackets, an inadvertent side effect of orthodontic treatment. The purpose of this study was to examine potential enamel damage induced by contact with zirconia brackets. Sliding and impact wear simulations were performed using bovine enamel specimens positioned at a 25° slant to a zirconium ball to determine wear behaviour. Different chewing patterns, tapping and grinding, were simulated. Specimens were profiled using confocal laser scanning microscopy, and the mean maximum depth and surface roughness were measured. Scanning electron microscopy was also performed. The mean maximum depth of wear values differed according to the number of mastication cycles, with a higher number of cycles producing higher depths of wear. The facet wear depth was significantly greater with the tapping pattern than with the grinding pattern. Scanning electron microscopic observation of the wear facets revealed that surface textures at the edges were rougher than those at the centre of all facets. The results of this study indicated that enamel wear was induced by contact with zirconia brackets during the early period of mastication, and that the patterns and number of cycles of mastication affected the wear progression of enamel.
CONFLICTS OF INTEREST
The authors declare that they have no conflicts of interest.
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