Smith R T, Shivapuja P K
Department of Orthodontics, School of Dentistry, University of Detroit, Mich.
Am J Orthod Dentofacial Orthop. 1993 May;103(5):448-51. doi: 10.1016/S0889-5406(05)81795-0.
Dual-cement resins are composite resins that are both light activated and chemically cured. They can be cured completely with a visible light source or by the catalyst and base reaction of the material. With the control of setting time, dual cements appear to offer clinicians advantages in orthodontic bonding. The purposes of the present research are to compare various dual cements in regard to orthodontic bonding and to evaluate them in relation to currently used chemically cured and light-cured composite resins for bonding stainless steel mesh-backed orthodontic brackets. Seven currently available orthodontic bonding systems (three light cured and four chemically cured) and three dual cements were evaluated. Each of the 10 groups contained 15 noncarious mandibular incisors. Mandibular incisor brackets were bonded to the teeth in accordance with the manufacturer's recommendation. After bonding, the teeth were stored for 5 days in water at 37 degrees C. An Instron machine (Instron Corp., Canton, Mass.) was used to test samples. All samples were compared with Concise orthodontic bonding composite (3M, St. Paul, Minn.). The results of this investigation show that it is possible to bond solid, mesh-backed metal orthodontic brackets to teeth with a dual cement. The shear bond strengths of the dual cements, as tested in the laboratory, should be adequate to withstand normal orthodontic forces. Increased control of the setting time of the dual cements will allow the clinician more time to correctly position brackets and to remove excess resin before curing. In addition, the clinician can be assured of complete polymerization with the chemical properties of the dual cement resins.
双固化树脂是既可以光固化又可以化学固化的复合树脂。它们可以通过可见光源完全固化，也可以通过材料的催化剂与基质反应来固化。通过控制固化时间，双固化树脂在正畸粘接方面似乎为临床医生提供了优势。本研究的目的是比较各种双固化树脂在正畸粘接方面的性能，并将它们与目前使用的用于粘接不锈钢网背正畸托槽的化学固化和光固化复合树脂进行评估。评估了七种目前可用的正畸粘接系统（三种光固化和四种化学固化）和三种双固化树脂。10组中的每组都包含15颗无龋下颌切牙。下颌切牙托槽按照制造商的建议粘接在牙齿上。粘接后，牙齿在37摄氏度的水中储存5天。使用Instron机器（Instron公司，马萨诸塞州坎顿）测试样本。所有样本都与Concise正畸粘接复合材料（3M公司，明尼苏达州圣保罗）进行比较。本研究结果表明，使用双固化树脂可以将实心、网背金属正畸托槽粘接至牙齿。在实验室测试中，双固化树脂的剪切粘接强度应足以承受正常的正畸力。对双固化树脂固化时间的更好控制将使临床医生有更多时间正确定位托槽并在固化前去除多余的树脂。此外，临床医生可以确信双固化树脂的化学性质能实现完全聚合。
