方法：肉眼观察63颗前牙在修复前后游离龈的色泽变化。
Methods: 63 anterior abutment free gingiva were observed with naked eye before and after restoration.
牙周病病因学研究逐步深入，凸显出龈下微生物检测的重要性。
With the further investigation on the periodontitis aetiology, the importance of the subgingival microbiological detection becomes more significant.
方法：对38颗牙体缺损达龈下的患牙行牙冠延长术，以恢复患牙的生物学宽度。
Methods:On 38 teeth due to various crown damages or vertical fractures in subgingival lesions were performed with surgical crown lengthening in order to achieve biologic width.
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