种植体颊侧软组织开裂（PSTD）是种植术后常见的临床并发症，指种植体颊侧软组织边缘相对对侧同名牙或基线水平（最终修复完成时）根向退缩≥1 mm；在无对侧同名牙或基线水平数据情况下，定义为种植修复部件、基台或植体表面的不利暴露。PSTD会影响种植治疗的美学效果，并可能增加生物学并发症的发生率。目前针对PSTD的研究较为欠缺，不同临床研究对于PSTD的定义标准仍存在差异，且缺乏统一的分类标准，临床上对于软组织开裂的治疗也存在较大争议；随着患者对于口腔治疗的美学要求逐渐提高，发生PSTD后通过治疗改善的需求越来越迫切。因此，本文拟结合种植体周围软组织相关研究，明确PSTD定义，评估PSTD的发生率及其相关影响因素，确定其适应证和治疗目标，提出PSTD的临床改良分类和相应治疗建议，为防治种植治疗中软组织开裂提供临床建议，提高患者对种植治疗的满意度。

Peri-implant buccal soft tissue dehiscence (PSTD) is a common clinical complication after oral implantation. PSTD can be defined as an apical migration of the peri-implant soft tissue for more than 1 mm from the baseline examination (final restoration) or in comparison with the adjacent or contralateral natural tooth, exposing part of the prosthetic components, the implant shoulder or surface. PSTD may jeopardize the aesthetic outcome and increase the incidence of biological complications. The research on PSTD is lacking at present. The definition and classification of PSTD have not been standardized. The treatment for soft tissue dehiscence was controversial. With the increasing aesthetic demands of patients, the treatment of PSTD becomes more and more urgent. Therefore, we reviewed the research progress on peri-implant buccal soft tissue dehiscence. We clearly defined the concept, indications and treatment goals of PSTD, and identified the factors associated with the occurrence of PSTD. We also presented a new classification system of PSTD at single implant site and provided treatment recommendations. Furthermore, we provided several implications for the prevention and control of PSTD to improve patients′ satisfaction.