2015年 · 第50卷第11期

Sufficient soft and hard tissue in the missing tooth area is the key to achieve good function and aesthetic effect of implant restoration. However, after the missing maxillary anterior teeth, there is often labial cortical bone resorption, which in turn causes the narrowing of the labiopalatine width of the alveolar ridge and the collapse of soft tissue, which makes the implant treatment of maxillary anterior teeth more difficult and makes the implant of upper anterior teeth more aesthetic risk. connect tissue graft (CTG) and guided bone regeneration (GBR) are commonly used soft and hard tissue increment methods respectively. A case of right upper central incisor implant treatment with simultaneous application of GBR and CTG obtained good functional and aesthetic results, to explore the related problems of implant restoration after severe soft and hard tissue defects in maxillary anterior teeth area.

Oral squamous cell carcinoma is a common malignant tumor in the head and neck, accounting for more than 90% of the malignant tumors in the maxillofacial region^[1]。 At present, the main treatment for oral squamous cell carcinoma is surgery, which can also be adjusted by radiotherapy and chemotherapy in advanced stage^[2]。 However, both radiotherapy and chemotherapy can have toxic side effects on the body^[3,4]。 Inappropriate adjuvant therapy is not only helpless for prognosis, but also will bring serious consequences and seriously affect the quality of life of patients. Therefore, it is of great significance to use the existing clinical and pathological examination results to judge the prognosis of patients and guide the postoperative adjuvant treatment for the treatment of oral squamous cell carcinoma.

Dental implant restoration is the closest restoration method to human natural dentition at present. The firm osseointegration of the intraosseous implant with the alveolar bone provides the support, retention, and stability needed for denture restoration^[1]。 Initial stability plays a crucial role in the formation of implant osseointegration, and studies have shown that implant fretting>50~150 µm may lead to adverse outcomes^[2]。 The main factors affecting the initial stability of implants are bone quality, bone-implant interface, implant geometry and implant cavity preparation methods^[3]。

The process of tooth eruption can be divided into bone stage before eruption, alveolar bone stage, mucosal stage, buildingPre-stage, constructionStages and maturation stages, and any disturbance occurring at these stages may result in eruption anomalies^[1]。 Impacted tooth is a kind of abnormal eruption, which often occurs in permanent tooth, but rarely in deciduous tooth^{[1,2,3,4,5,6,7,8,9]}。 The orthodontic department of Wuxi Stomatological Hospital received a case of left maxillary second deciduous molar and right mandibular second deciduous molar simultaneously ambushed under impacted inherited permanent teeth, resulting in partial opening of posterior teethOf patients, reported below.