结论：结果表明，只有保持正常的生物学宽度才能达到完美的效果和长久的疗效。
Conclusion: the nice effectiveness and the better curative effect depend on keeping biological width normal.
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.
应用骨探测法探察牙槽骨嵴顶的位置，确定其生物学宽度。
We located the alveolar bone crest by sounding and determined its biological width.
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