以下为句子列表：
英文: According to a study by the Veterans Affairs Boston Healthcare System, cigarette smoking can lead not only to tooth dis coloration and gum disease, but often to the need for root canal treatment as well.
中文: 根据退伍老兵事务波士顿保健系统公司进行的一项研究，吸烟不仅会引起牙齿变色和齿龈疾病，而且通常会导致必须进行根管治疗。
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英文: Conclusion: calcium hydroxide iodoform paste used in root canal disinfection can decrease times of the block therapy on chronic periapical abscess with sinuses.
中文: 结论：用氢氧化钙碘仿糊剂根管内封药消毒能够减少有窦型慢性根尖周脓肿根管封药消毒的次数，有利于窦道的尽快愈合。
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英文: Man reading dental bill: Root canal He charged me for the Suez Canal!
中文: 译文:一个人一边看着牙医开的帐单一边说,根槽他收我的费用都可以修苏伊士运河了!
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英文: Methods: 113 teeth of 79 patients with combined periodontic-endodontic lesions were treated with the combination of root canal therapy and periodontal treatment.
中文: 方法：对79例牙周－牙髓联合病变113个牙的临床资料进行分析，采取牙髓牙周综合治疗，观察疗效。
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英文: Methods: The root canal with root canal orifice burs and helical drilling bits were prepared in advance.
中文: 方法：采用根管口台阶状车针与螺旋型根管钻组合起来扩大根管。
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