Unverified80% confidenceTradeoffTime unknown
膨胀型PTFE（特氟龙）牙线进入牙缝后遇摩擦会膨胀展开、贴合牙面，柔韧不易断丝，对牙龈刺激小，适合牙龈易出血或初次使用牙线的儿童；尼龙多股线更易在紧牙缝处断裂残留
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80%
Confidence
Long-term
Relevance
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Unverified膨胀型（PTFE或海绵状）牙线遇唾液后变宽，清洁面积大且不易嵌塞，适合牙缝较宽者；但穿过紧密接触点较困难88% similarUnverified牙缝正常或偏窄者选PTFE（特氟龙）膨体线，不易起毛断裂；牙缝较大者选膨胀式尼龙线（如含蜡海绵线），进缝后膨胀更贴合清洁面85% similarUnverified带涂层（如PTFE特氟龙涂层）牙线顺滑易过窄缝但可能残留纤维，膨胀型（PTFE扩展）牙线清洁面积大更适合正常牙缝，出血牙龈期优选顺滑涂层减少刺激85% similarUnverified膨胀型牙线（如PTFE/expanding floss）遇唾液后纤维膨胀，对牙周袋较深、牙龈萎缩露出牙根间隙的中老年人清洁效率更高，比普通尼龙线更适合84% similarUnverified牙缝较大或有牙龈退缩者应选膨体尼龙线（PTFE膨体/海绵型），入缝后横向膨胀能有效刮除较宽牙缝的软垢；用超细单丝线反而清洁效率低84% similar
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