牙冠延长术是近年来临床研究和推广的热门课题.临床上经常遇到因龋病、冠折等原因造成龈上牙体组织过短,给冠修复带来困难;如果冠边缘延伸至龈下过深,侵犯了生物学宽度,则易引起牙周问题.牙冠延长术利用生物学宽度的原理,应用翻瓣术联合牙槽骨修整的方法,延长牙冠或暴露龈下的牙体断端,其重点在于切除牙龈的同时,去除部分牙槽骨,以便在更根方的位置重建健康的牙周组织.%Crown lengthening surgery is a hot topic in clinic research. We often encountere too short teeth structures caused by caries or crown fracture. If the denture crown margin violate the biologic width periodontal problems will occur. Crown lengthening surgery, abide by the principle of biological width, using flap surgery combined with alveolar bone trimming can extend crown or expose the subgingival teeth structure by removing part of the alveolar bone and gum so as to reestablish healthy periodontal tissue in apical direction.
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