2018年 · 第53卷第07期

Intentional tooth reimplantation is aimed at some difficult teeth which are difficult to cure by conventional methods. The teeth are completely extracted and implanted into the original alveolar socket after a series of in vitro diagnosis, examination and treatment in order to achieve the purpose of preserving the affected teeth^[1]。 This method is considered to be the last option for preserving the affected tooth when other methods cannot be implemented^[2]。 A case of chronic apical periodontitis of mandibular second molar that could not undergo root canal retreatment and apical surgery was admitted to the Stomatological Hospital of Southern Medical University. Intentional dental replantation was used to preserve the affected tooth. After 2 and a half years of follow-up, the curative effect was satisfactory, and the report is as follows.

systemic contact dermatitis (SCD) refers to polydermatitis caused by exposure to sensitizing substances by systemic means (such as oral administration, inhalation, and absorption through rectal mucosa or skin, etc.) in patients who have been exposed to sensitization^[1]。 SCD is rare, usually caused by specific components in drugs, metals and chemicals, and mediated by type III and IV hypersensitivity reactions^[2]。 Cobalt-chromium-molybdenum alloy is a new bioalloy obtained by adding molybdenum element to traditional cobalt-chromium alloy. It has high strength, high elasticity and good biocompatibility. It has been widely used in artificial joints, prostheses and denture brackets. A case of SCD caused by cobalt-chromium-molybdenum alloy denture bracket is reported.

Progressive myositis ossificans progressia (MOP), also known as progressive fibrodysplastic ossification, is characterized by progressive ossification of connective tissue inside fascia, ligaments, tendons, joint capsules, and skeletal muscle spaces in the whole body, combined with skeletal deformities, resulting in abnormal movement of many joints in the whole body and even loss of function, which is prone to clinical misdiagnosis and mistreatment^[1]。 The Department of Oral and Maxillofacial Surgery of the First Affiliated Hospital of Zhengzhou University diagnosed and treated a case of MOP, which is reported as follows.