焦磷酸钙菱形结晶在红感光板偏振光下呈蓝白色(弱正双折射)。

This rhomboid shaped crystal of calcium pyrophosphate, which appears bluish-white (weak positive birefringence) by polarized light with red plate.

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结果偏光显微镜下观察，实验组釉质表面完整，主要表现为以脱矿为主的正性双折射区明显减少；

Results Polarized light microscope showed that the enamel surface of the experimental group were completed, the areas of positive birefringence were decreased obviously.

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