O'Dwyer Jonathan J, Tinsley David, Benson Philip E
Orthodontic Department, Charles Clifford Dental Hospital, Sheffield, United Kingdom.
Am J Orthod Dentofacial Orthop. 2005 Oct;128(4):471-6. doi: 10.1016/j.ajodo.2004.06.034.
The aim of this in-vitro investigation was to determine whether stretching increases the amount of fluoride released from fluoridated elastomeric ligatures.
Ten groups of 4 fluoridated elastomeric ligatures stretched over edgewise premolar brackets were compared with 10 groups of 4 ligatures that were not stretched over brackets. Each group was placed in individual polyethylene bottles containing 1 mL of distilled water and maintained at 37 degrees C in an incubator. A polyethylene bottle containing only distilled water and 4 brackets was used as the control. The fluoride content of the samples was determined once a day for 7 days and regularly thereafter up to 196 days. A fluoride-ion selective electrode coupled to an analyzer was used to determine the fluoride content of the solutions. The sample solutions were changed 24 hours before readings to prevent the results from being cumulative.
The fluoride-ion release for each of the groups was calculated and expressed as total fluoride release in micrograms of fluoride per day per milliliter per elastomer. During the first month in solution, the stretched fluoridated elastomers released approximately 32 microgF.day/mL and the unstretched speciments released 30 microgF.day/mL. This represents a 7% increase in fluoride release, which was statistically significant (P = .007). Over the entire test period (196 days), the modules stretched over the brackets released about 13% more fluoride. This was also a statistically significant difference (P = .001).
Stretching increases the concentration and amount of fluoride released from fluoridated elastomeric ligatures.
本体外研究的目的是确定拉伸是否会增加含氟弹性结扎圈释放的氟化物量。
将十组每组4个套在方丝弓前磨牙托槽上的含氟弹性结扎圈与十组每组4个未套在托槽上的结扎圈进行比较。每组分别置于装有1 mL蒸馏水的单个聚乙烯瓶中，并在37摄氏度的培养箱中保存。使用一个仅装有蒸馏水和4个托槽的聚乙烯瓶作为对照。每天测定一次样品的氟含量，持续7天，此后定期测定直至196天。使用与分析仪相连的氟离子选择性电极测定溶液中的氟含量。在读取数据前24小时更换样品溶液，以防止结果累积。
计算每组的氟离子释放量，并表示为每毫升每个弹性体每天释放的氟化物微克数的总氟释放量。在溶液中的第一个月，拉伸的含氟弹性体释放约32μgF·天/mL，未拉伸的样品释放30μgF·天/mL。这代表氟释放量增加了7%，具有统计学意义（P = 0.007）。在整个测试期（196天）内，套在托槽上的组件释放的氟化物多约13%。这也是一个具有统计学意义的差异（P = 0.001）。
拉伸会增加含氟弹性结扎圈释放的氟化物浓度和量。
