【简答题】
牙髓电活力测试假阳性和假阴性的原因有哪些？
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答案
牙髓电活力测试，是通过牙髓电测仪测验牙髓神经成分对电刺激的反应，从而判断牙髓状态的方法。
（1）造成假阳性的原因：［过度反应］
①探头或电极接触了大面积金属修复体或牙龈使电流流向了牙周纽织；
②未充分隔湿或干燥受试牙，以致电流漏向了牙周；
③液化性坏死性牙髓有可能传导电流致根尖周；
④患者过度紧张或焦虑以致于探头刚接触牙面或被问之感受时即抬手。
（2）造成假阴性的原因：［无反应］
①先服用镇痛剂、麻醉剂或酒精饮料；（使之不能正常地感知电刺激）
②头或电极未能有效接触釉质；（妨碍了电流传导至牙髓）
③尖尚未发育完全的新萌出牙；（其牙髓通常对电流刺激无反应）
④管内过度钙化的牙；（其牙髓通常对电流刺激无反应，常见于些老年人患牙）
⑤受过外伤的牙。（可对电流刺激无反应）
解析
暂无解析
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