Abstract: In recent years，laser is widely used in the field of oral therapy. In periodontal treatment，laser can be used to scaling，root planing，soft tissue and bone repair. It is a useful assistant therapeutic method for periodontal treatment. Low level laseris a kind of laser which has lower energy and does not produce heat during treatment. Low level laser therapy can inhibit inflammation，promote wound healing and enhance periodontal tissues regeneration during periodontal treatment. This review mainly introduced the characteristics，working mechanism，clinical application method of low energy laser，aiming to provide therapeutic methods for further clinical application.

Key words: low level laser therapy, biomodulation, periodontal tissue, wound healing

摘要： 近年来激光在口腔医学领域的应用日益广泛。在牙周治疗中，激光可用来进行牙结石去除、根面处理、软组织及骨修整等，参与到牙周治疗的各个环节，起到很好的辅助牙周治疗作用。低能量激光是指能量较温和、治疗时不产生热量的一类激光。在牙周治疗时可利用其生物刺激功能起到抑制牙周炎症、促进创口愈合及牙周组织再生等方面的作用。文章主要介绍低能量激光的特点、作用机制及临床使用方法，为低能量激光治疗在临床的进一步推广应用提供思路。

关键词: 低能量激光治疗, 生物调节, 牙周组织, 创口愈合