Department of Orthodontics and Dentofacial Orthopedics, The Tokushima University Medical and Dental Hospital, Tokushima, Japan.
Angle Orthod. 2012 Jan;82(1):30-5. doi: 10.2319/012011-39.1. Epub 2011 Jul 13.
To determine the reinforcement of bond strength of a self-etching system by applying a pretreatment agent.
Sixty extracted human premolars were used in this study. The enamel surfaces were treated with four pretreatment agents-phosphoric acid, polyacrylic acid, citric acid, and ammonium hexafluorosilicate (SiF)-and were examined under a scanning electron microscope. Afterward, orthodontic brackets were bonded with a self-etching adhesive system (n = 10 for each agent), and shear bond strength was measured through a debonding process. The adhesive remnant index (ARI) was also assessed.
Enamel surfaces treated with polyacrylic acid seemed almost the same as intact enamel. Treatment with SiF induced slight shallow depressions compared with the intact enamel. On the other hand, enamel surfaces treated with citric acid and phosphoric acid showed severe etching patterns. All pretreatments increased the bond strength, but SiF-treated specimens revealed the greatest strength (12.201 ± 1.048 MPa), followed by polyacrylic acid (12.030 ± 2.103 MPa). The control group with no pretreatment showed the least strength (9.078 ± 1.678 MPa). All pretreatments increased ARI score compared with the control group.
Surface conditioning before bracket adhesion could reinforce the bond strength of the self-etching adhesive system, resulting in a more reliable bonding system.
通过应用预处理剂来确定自酸蚀系统的粘结强度增强效果。
本研究使用了 60 个人类前磨牙。使用四种预处理剂（磷酸、聚丙烯酸、柠檬酸和六氟硅酸铵（SiF））对牙釉质表面进行处理，并在扫描电子显微镜下进行检查。之后，用自酸蚀粘结剂系统（每种试剂 10 个样本）粘结正畸托槽，并通过离断过程测量剪切粘结强度。还评估了粘结残留指数（ARI）。
用聚丙烯酸处理的牙釉质表面看起来几乎与完整牙釉质相同。与完整牙釉质相比，用 SiF 处理后会产生轻微的浅层凹陷。另一方面，用柠檬酸和磷酸处理的牙釉质表面显示出严重的蚀刻图案。所有预处理都增加了粘结强度，但 SiF 处理的标本显示出最大的强度（12.201 ± 1.048 MPa），其次是聚丙烯酸（12.030 ± 2.103 MPa）。未进行预处理的对照组显示出最小的强度（9.078 ± 1.678 MPa）。与对照组相比，所有预处理都提高了 ARI 评分。
在粘结托槽之前进行表面处理可以增强自酸蚀粘结剂系统的粘结强度，从而形成更可靠的粘结系统。
