Mourshed Bilal, Qaed Nashwan Mohammed, Al-Shamiri Hashem Motahir, Alaizari Nader, Alhamdah Saleh Sulaiman, Alfaqih Amal
Department of Prosthetic Dentistry, Al-Farabi Colleges, Riyadh, Saudi Arabia.
Graduate Student, Al-Farabi Colleges, Riyadh, Saudi Arabia.
Eur J Dent. 2017 Jul-Sep;11(3):352-356. doi: 10.4103/ejd.ejd_158_17.
The purpose of this study was to investigate the importance of environments (dry and wet) to dislodge the clasp.
Mandibular test models with natural premolar and molar teeth were used to test four types of clasp (each 12) (Akers, rest plate Akers [RPA], half and half [H-H], and ring clasp) in dry and natural fresh saliva environments. Each clasp was pulled out 10 times with a crosshead speed of 10 mm/min and the force required to withdraw each was measured.
A paired sample -test and Wilcoxon test were used.
There were significant differences between the dry and wet (natural fresh saliva) environment. However, while the mean of the environment for RPA and ring clasp type was significantly different, the H-H and Akers clasp type was not.
The environment has an effect on dislodging the clasp but differs according to the type of clasp.
本研究旨在调查环境（干燥和湿润）对卡环脱位的影响。
使用带有天然前磨牙和磨牙的下颌测试模型，在干燥和天然新鲜唾液环境中测试四种类型的卡环（每种12个）（艾氏卡环、带支托板的艾氏卡环[RPA]、对半卡环[H-H]和环形卡环）。每个卡环以10 mm/min的十字头速度拔出10次，并测量拔出每个卡环所需的力。
采用配对样本t检验和威尔科克森检验。
干燥和湿润（天然新鲜唾液）环境之间存在显著差异。然而，虽然RPA和环形卡环类型的环境均值有显著差异，但H-H和艾氏卡环类型则没有。
环境对卡环脱位有影响，但因卡环类型而异。
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