PDF(Pubmed)
Abstract：
OBJECTIVE: Although magnetic attachment is used frequently for overdenture, it is reported that attractive force can be decreased by abrasion and corrosion. The purpose of this study was to establish the clinical basis about considerations and long term prognosis of overdenture using magnetic attachments by investigating the change in attractive force of magnetic attachment applied to the patients.
METHODS: Among the patients treated with overdenture using magnetic attachments in Dankook University Dental Hospital, attractive force records of 61 magnetic attachments of 20 subjects who re-visited from July 2013 to June 2014 were analyzed. Dental magnet tester (Aichi Micro Intelligent Co., Aichi, Japan) was used for measurement. The magnetic attachments used in this study were Magfit IP-B Flat, Magfit DX400, Magfit DX600 and Magfit DX800 (Aichi Steel Co., Aichi, Japan) filled with Neodymium (NdFeB), a rare-earth magnet.
RESULTS: Reduction ratio of attractive force had no significant correlation with conditional variables to which attachments were applied, and was higher when the maintenance period was longer (P<.05, r=.361). Reduction ratio of attractive force was significantly higher in the subject group in which attachments were used over 9 years than within 9 years (P<.05). Furthermore, 16.39% of total magnetic attachments showed detachment of keeper or assembly.
CONCLUSIONS: Attractive force of magnetic attachment is maintained regardless of conditional variables and reduction ratio increased as the maintenance period became longer. Further study on adhesive material, attachment method and design improvement to prevent detachment of magnetic attachment is needed.
METHODS: Among the patients treated with overdenture using magnetic attachments in Dankook University Dental Hospital, attractive force records of 61 magnetic attachments of 20 subjects who re-visited from July 2013 to June 2014 were analyzed. Dental magnet tester (Aichi Micro Intelligent Co., Aichi, Japan) was used for measurement. The magnetic attachments used in this study were Magfit IP-B Flat, Magfit DX400, Magfit DX600 and Magfit DX800 (Aichi Steel Co., Aichi, Japan) filled with Neodymium (NdFeB), a rare-earth magnet.
RESULTS: Reduction ratio of attractive force had no significant correlation with conditional variables to which attachments were applied, and was higher when the maintenance period was longer (P<.05, r=.361). Reduction ratio of attractive force was significantly higher in the subject group in which attachments were used over 9 years than within 9 years (P<.05). Furthermore, 16.39% of total magnetic attachments showed detachment of keeper or assembly.
CONCLUSIONS: Attractive force of magnetic attachment is maintained regardless of conditional variables and reduction ratio increased as the maintenance period became longer. Further study on adhesive material, attachment method and design improvement to prevent detachment of magnetic attachment is needed.
摘要：
目的：虽然磁性附着体经常用于覆盖义齿，据报道，吸引力可以通过磨损和腐蚀来降低。本研究的目的是通过研究应用于患者的磁性附着体的吸引力变化，建立有关使用磁性附着体的覆盖义齿的考虑和长期预后的临床基础。
方法：在Dankook大学牙科医院使用磁性附着体进行覆盖义齿治疗的患者中，对2013年7月至2014年6月重新访问的20名受试者的61个磁性附着体的吸引力记录进行分析.牙科磁铁测试仪(爱知微智能有限公司，爱知,日本)用于测量。本研究中使用的磁性附件是MagfitIP-BFlat，MagfitDX400、MagfitDX600和MagfitDX800(爱知钢铁公司，爱知,日本）充满钕（NdFeB），稀土磁铁.
结果：吸引力的减速比与施加附件的条件变量没有显着相关性，当维持时间较长时，则更高（P<.05，r=.361）。在使用超过9年的附件的受试者组中，吸引力的减少率明显高于9年内（P<0.05）。此外，总磁性附件的16.39%显示保持器或组件脱离。
结论：无论条件变量如何，磁附着的吸引力都保持不变，并且随着维持时间的延长，减速比增加。对粘合材料的进一步研究，需要改进连接方法和设计以防止磁性连接的分离。
方法：在Dankook大学牙科医院使用磁性附着体进行覆盖义齿治疗的患者中，对2013年7月至2014年6月重新访问的20名受试者的61个磁性附着体的吸引力记录进行分析.牙科磁铁测试仪(爱知微智能有限公司，爱知,日本)用于测量。本研究中使用的磁性附件是MagfitIP-BFlat，MagfitDX400、MagfitDX600和MagfitDX800(爱知钢铁公司，爱知,日本）充满钕（NdFeB），稀土磁铁.
结果：吸引力的减速比与施加附件的条件变量没有显着相关性，当维持时间较长时，则更高（P<.05，r=.361）。在使用超过9年的附件的受试者组中，吸引力的减少率明显高于9年内（P<0.05）。此外，总磁性附件的16.39%显示保持器或组件脱离。
结论：无论条件变量如何，磁附着的吸引力都保持不变，并且随着维持时间的延长，减速比增加。对粘合材料的进一步研究，需要改进连接方法和设计以防止磁性连接的分离。
