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问题 单项选择题

此患者最佳首次治疗措施是（）。

A．去除大块牙石及坏死物，3%H2O2冲洗

B．尽量除净牙石及坏死物，3%H2O2冲洗

C．口服抗生素及维生素C

D．保守治疗，需查血确诊

E．1%～2%H2O2含漱1周

答案

参考答案：A

解析：

[解题思路] 坏死性龈炎急性期的治疗是先轻轻除去坏死组织，初步刮除大块牙石，用1%～3%过氧化氢溶液(局部用氧化剂)反复冲洗和含漱，从而释放新生氧，抑制厌氧菌并机械地清除表面坏死物和除臭。首次治疗若尽量除净牙石会造成过度疼痛，不是最佳的治疗。只全身用药或只含漱剂含漱而不对坏死区进行局部处理都不是最佳选择。

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单项选择题

拆下电容器引线，测量拆下导线与车体间电阻，当电阻无穷大时，故障为（）。

A、断路

B、短路

C、正常

D、以上均不对
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