以下为句子列表：
英文: Methods: In one mouth, the teeth of one side were as test group, other side as control group, the first molar in non-carious pit and fissure of 500 children were sealed.
中文: 方法：将500例儿童的第一恒磨牙分为两组，一侧第1恒磨牙为一组，对侧同名牙为第2组。
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英文: RESULTS: With three different retainer designs, the retainer on the second premolar and the first molar exerted the smallest stress on the abutment and its periodontal tissue, while the retainer on the first premolar and the first molar had the largest st
中文: 结果：在3种不同的固位体设计方式中，固位体放置在第二前磨牙与第一磨牙之间时，基牙及牙周组织受力最小；固位体放置在第一前磨牙与第一磨牙上，基牙与牙周组织受力最大。
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英文: Before the rats were killed, supragingival bacteria were wiped off with aseptic curette and cotton swabs, and two aseptic paperpoints were respectively put on the mesial and distal buccal gum of the upper left first molar under general anesthesia;
中文: 处死实验大鼠前在全麻下,用无菌刮匙和棉签去除龈上菌斑后,用两根无菌纸尖分别置于大鼠左上第一磨牙的近中颊侧和远中颊侧龈下0s来采集龈下菌斑标本。
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英文: Results:The distance between buccal border of buccal grooves of mandibular the first molar and the posterior border of lingula of the opposite mandible was 8.9±0. cm .
中文: 果：由下颌第一磨牙颊沟的颊缘水平伸至对侧下颌小舌后缘间距离为8．9±0．cm；
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英文: There was statistically significant in the average distal movement of the upper first molar (.7 mm,P≤0.0)and the average mesial movement of the lower first molar (. m,P≤0.00).
中文: 上颌第一磨牙平均远中移动.7mm(P≤0.0),下颌第一磨牙平均 近中移动.mm(P≤0.00)。
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