Aim: to study the electric resistance of the crown surface of tooth.

目的：研究牙冠表面电阻状态。

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Objective to evaluate the effect to caries of the fixed appliance by the investigation of plaque index on the crown surface of teeth at the different stages.

目的通过调查固定矫治器治疗中牙冠表面托槽周围的牙菌斑指数评价固定矫治器对龋病的影响。

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Conclusions Applying 30% supersaturated potassium oxalate to block dentinal tubule could prevent or reduce crown surface discoloration effectively after front teeth canal therapy.

结论使用30%草酸钾封闭牙本质小管可有效防止及减少前牙根管治疗后牙冠变色。

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If Nadal, looking to defend his French Open crown on his favorite clay surface later this year, can get past Gulbis, he is likely to face his first big test with a possible last eight clash against his great rival Roger Federer , the second seed.

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Many of the dead trees are still standing, and can serve as ladder fuels that transform relatively cool surface fires into hot, fast-moving crown fires that leap from treetop to treetop.

FORBES: Forests and Climate Change: a Combustible Combination