第三磨牙俗称智齿,从牙胚发育到萌出时间跨度大,萌出情况复杂,初萌年龄为14～38岁,一般集中在17～21岁。人类咀嚼器官因受饮食种类及饮食习惯影响已发生退化,颌骨逐渐缩小,牙列与颌骨不协调,导致第三磨牙萌出位置不足,易出现阻生。智齿疾患在大学生中发病率很高,特别在学习任务重、精神压力大的考试期间发病率更高 The third molars, commonly known as wisdom teeth, develop from tooth germ to eruption time span, eruption is complex, early adulterated age of 14 to 38 years old, generally concentrated in the 17 to 21 years old. Human chewing organ due to the impact of diet and eating habits have been degraded, gradually narrowing of the jaw, dentition and jaw incompatibility, resulting in lack of eruption of the third molar, prone to impacted. Wisdom tooth disease is a high prevalence among college students, especially in those with heavy learning tasks and stressful tests