Results The predilection age of cracked-teeth was 40 - 60 years old, the predilection teeth of cracked-teeth was maxillary molar and the first maxillary molar was the most freqnently found.
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- 结果牙隐裂的好发年龄为40-60岁,好发牙位为上颌磨牙,其中以第一磨牙最为多见。