不同时间段使用的颌间弹力牵引所释放力量的比较。
Comparison of the Force Released by Intermaxillary Elastics Used for Different Time Periods.
作者信息
Nitrini Andressa Tribulato Lopes, Chagas Adenilson Silva, Freitas Karina Maria Salvatore, Valarelli Fabrício Pinelli, Cançado Rodrigo Hermont, de Oliveira Renata Cristina Gobbi, de Oliveira Ricardo Cesar Gobbi
机构信息
Department of Orthodontics, UNINGA University Center, Maringá, Brazil.
出版信息
Turk J Orthod. 2019 Dec 1;32(4):190-194. doi: 10.5152/TurkJOrthod.2019.18022. eCollection 2019 Dec.
OBJECTIVE
The objective of the present study was to compare the strength degradation of the force of intermaxillary elastic used for different periods.
METHODS
The sample included intermaxillary elastics used for 20 adult patients with bilateral Class II or III malocclusion in orthodontic treatment with fixed appliances, with a mean age of 27.25 years. Latex orthodontic elastics with 3/16 inch of diameter were used, with an average stretching of three times its diameter. The elastics were used in the same patient bilaterally for different periods, with each pair of elastics used for 1, 12, 24, and 48h. Thus, the sample consisted of 200 elastics, with 40 being used in each period (one pair used by each patient) and 40 new elastics without use tested as control. Elastics were tested using a universal testing machine, stretched with a velocity of 30 mm/min, and the force was evaluated in stretches of 15, 20, 25, and 30 mm. The degradation force was compared in the four different times of use and control by one-way ANOVA (analysis of variance) and Tukey tests.
RESULTS
There were significant differences among the groups in all evaluated stretches (15, 20, 25, and 30 mm). The control elastics presented higher average forces numerically and statistically significant for all tested times, except for the elastic used for 1h. The elastics used for 1, 12, and 24h had similar forces among them, with a significant difference to the elastics used for 48h.
CONCLUSION
It is recommended to change the intermaxillary elastics after 24 h of use.
目的
本研究的目的是比较用于不同时间段的颌间弹力的强度降解情况。
方法
样本包括用于20例接受固定矫治器正畸治疗的双侧安氏II类或III类错牙合成年患者的颌间弹力，平均年龄27.25岁。使用直径为3/16英寸的乳胶正畸弹力，平均拉伸为其直径的三倍。弹力在同一患者双侧用于不同时间段，每对弹力分别使用1、12、24和48小时。因此，样本由200个弹力组成，每个时间段使用40个（每位患者使用一对），并测试40个未使用的新弹力作为对照。使用万能试验机对弹力进行测试，以30毫米/分钟的速度拉伸，并在15、20、25和30毫米的拉伸时评估力。通过单因素方差分析（方差分析）和Tukey检验比较四个不同使用时间和对照的降解力。
结果
在所有评估的拉伸（15、20、25和30毫米）中，各组之间存在显著差异。对照弹力在所有测试时间的数值上和统计学上均呈现出较高的平均力，但用于1小时的弹力除外。用于1、12和24小时的弹力之间的力相似，与用于48小时的弹力有显著差异。
结论
建议在使用24小时后更换颌间弹力。
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