尽量保存牙体组织是治牙的基本原则．牙体组织缺损大，造成冠折、劈裂、充填物脱落的机会相应增多．通过多年的临床实践，我们对后牙V类洞需行牙髓处理者打破常现从颌面揭饭项而直接从颈部进入髓腔处理冠髓，而保留颌面，取得满意疗效，现报道如下．1对象和方法选择近两年后牙V Trying to save tooth tissue is the basic principle of dental treatment. Tooth tissue defects, resulting in crown fracture, splitting, the corresponding increase in the chance of filling off. Through many years of clinical practice, we have to dental pulp treatment of Class V posterior teeth need to break the dental pulp is usually from the mouth and directly into the medullary cavity from the neck to treat the coronal, while retaining the maxillofacial, and achieved satisfactory results, and now Reported as follows. 1 object and method of choice after nearly two years teeth V