Evaluation of mechanical properties of three different screws for rapid maxillary expansion
Evaluation of mechanical properties of three different screws for rapid maxillary expansion
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DOI：
10.1186/1475-925x-12-128
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发表时间：
2013-12-11
影响因子：
3.9
通讯作者：
Defraia, Efisio
中科院分区：
文献类型：
--
作者：
Camporesi, Matteo;Franchi, Lorenzo;Defraia, Efisio
背景：这项体外研究的目的是评估用于快速上颌扩张 (RME) 的螺钉的机械性能。方法：测试了三种用于 RME 的市售螺钉：Leone A2620；Leone A2620；RME 螺钉。齿蹄兔； Forestadent 腭裂螺钉。所有膨胀螺钉的尺寸均为 10 毫米。为了评估机械性能，使用相同的上颌牙齿模型调整 RME 螺钉。配备 5 kN 测力传感器的 Instron 3365 试验机记录了螺钉在不同激活量（1、5、10、15 和 20 四分之一圈）下释放的力。每种类型的螺杆均测试10次。通过 Kruskal-Wallis 检验和事后检验 di Tukey 的分析，对不同类型的螺钉在不同激活量下释放的力进行比较（P < 0.05）。 结果：本研究的结果表明，所有 3 个扩张装置都能够产生能够产生腭突分离的力。 Hyrax 和 A2620 扩张器产生的力值超过 20 公斤，Palatal Split 螺钉的力值约为 16 公斤。相对于腭裂螺钉，A2620 和 Hyrax 扩张器在所有不同的激活量下都显示出明显更大的力。结论：所有测试的设备都显示出足以满足 RME 的扩张力（16-20 kg）的能力。 A2620 和 Hyrax 扩张器表现出比腭裂螺钉更高的刚性。
Background: The aim of this in vitro study was the evaluation of the mechanical properties the screws for rapid maxillary expansion (RME).Methods: Three commercially available screws for RME were tested: Leone A2620; Dentaurum Hyrax; Forestadent Palatal Split Screw. All expansion screws were 10 mm in size. For the evaluation of mechanical properties, the screws for RME were adjusted using the same maxillary dental model. An Instron 3365 testing machine with a load cell of 5 kN recorded the forces released by the screws at different amounts of activation (1, 5, 10, 15 and 20 quarters of a turn). Each type of screw was tested 10 times. Comparisons between the forces released by the different types of screws at different amounts of activation were carried out by means of analysis of Kruskal-Wallis test with post-hoc test di Tukey (P < 0.05).Results: The results of this study showed that all 3 expansion devices were able to develop forces that could produce a separation of the palatine processes. The Hyrax and A2620 expanders developed force values over 20 kg and the Palatal Split screws about 16 kg. Both the A2620 and Hyrax expanders showed significantly greater amounts of forces at all the different amounts of activations with respect to the Palatal Split screw.Conclusions: All tested devices showed the capability of developing expansion forces (16-20 kg) adequate for RME. The A2620 and Hyrax expanders showed a greater level of rigidity than the Palatal Split screw.