Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Angle Orthod. 2013 Jul;83(4):648-52. doi: 10.2319/091512-737.1. Epub 2013 Jan 11.
To evaluate the in vivo effects of two acidic soft drinks (Coca-Cola and Sprite) on the shear bond strength of metal orthodontic brackets with and without resin infiltration treatment. In addition, the enamel surface was evaluated, after debonding, using a scanning electron microscope.
Sixty noncarious maxillary premolars, scheduled for extraction in 30 orthodontic patients, were used. Patients were randomly divided into two groups according to the soft drink tested (Coca-Cola or Sprite). In each group, application of resin infiltration (Icon. DMG, Hamburg, Germany) was done on one side only before bonding of brackets. Patients were told to rinse their mouth with their respective soft drink at room temperature for 5 minutes, three times a day for 3 months. Shear bond strength was tested with a universal testing machine. After shearing test, a scanning electron microscope was used to evaluate enamel erosion. Statistical analysis was performed by twoway analysis of variance followed by the least significant difference test.
The Coca-Cola group without resin infiltration showed the lowest resistance to shearing forces. Scanning electron micrographs of both groups after resin application showed a significant improvement compared with results without resin use, as the enamel appeared smoother and less erosive.
Pretreatment with the infiltrating resin has proved to result in a significant improvement in shear bond strength, regardless of the type of soft drink consumed.
评估两种酸性软饮料（可口可乐和雪碧）对经和未经树脂渗透处理的金属正畸托槽的剪切结合强度的体内影响。此外，还使用扫描电子显微镜评估了离解后的牙釉质表面。
使用 30 名正畸患者中计划拔除的 60 颗非龋上颌前磨牙。根据所测试的软饮料（可口可乐或雪碧），患者被随机分为两组。在每组中，仅在粘结托槽之前在一侧应用树脂渗透剂（Icon. DMG，汉堡，德国）。告知患者用各自的软饮料在室温下漱口 5 分钟，每天 3 次，持续 3 个月。使用万能试验机测试剪切结合强度。剪切试验后，使用扫描电子显微镜评估牙釉质侵蚀。采用双向方差分析，随后进行最小显著差异检验进行统计分析。
未经树脂渗透处理的可口可乐组显示出最低的抗剪切力。两组在应用树脂后的扫描电镜照片显示，与未使用树脂的结果相比，牙釉质明显更光滑，侵蚀性更小，有显著改善。
无论饮用哪种软饮料，预处理的渗透树脂都已被证明可显著提高剪切结合强度。
