Our objective in dentistry is to keep patients’ teeth in the best condition and make them function well over a lifetime. When a population is aging, the signifi cance of periodontal therapy for the maintenance of periodontal tissue of middle-aged and older persons is great. 　Periodontal therapy is broadly classified into an active treatment phase（including initial preparation, periodontal surgery, etc.）and a maintenance therapy phase. The maintenance therapy, in particular, is a treatment phase aimed to maintain the periodontal tissue improved by an active treatment for periodontal patients with a high risk of recurrence. In an aging society, the treatment is very important and the treatment periods involving patients become very long. It has been demonstrated by many reports that maintenance therapy / supportive periodontal therapy raise the survival rate of teeth and, at the same time, are effective in preventing the recurrence of periodontitis. Many studies on the causes of occurrence and risk factors of periodontal disease and its systematic factors have been recognized. However, how periodontitis relapses during a long maintenance period, what factors affect it, and what factors can predict a recurrence among patients who had received periodontal therapy, are barely known. Tooth root fracture and root caries are often recognized during the maintenance therapy/ supportive periodontal therapy, which often cause tooth loss. The causes of recurrence of periodontitis and tooth loss are considered to be involved in the factors of occlusion and plaque control. However, neither local nor systematic factors that affect these causes have been clarified. Therefore, it is considered to be important to clarify the factors which contribute to the prevention of the recurrence of periodontitis and tooth loss. This can be accomplished by examining the oral condition along with the whole body and psychological conditions together with the items of general practice at the time of treatment for patients with periodontal disease during the maintenance therapy period and supportive periodontal therapy period, and investigating and analyzing the relationships between the examination results and factors of the recurrence of periodontitis and tooth loss. The author would like to discuss various investigations conducted on long-term maintenance patients.

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There have been many recent reports on the use of a polyglycolic acid（PGA）sheet and fi brin glue on open wounds after partial glossectomy．Among 20 patients who underwent partial glossectomy a PGA sheet and fibrin glue were used for 10，while an artificial dermis was used for the others．We evaluated surgical duration，postoperative bleeding，postoperative pain，time taken for removal of the sheet，the time taken for food to transit from the oral cavity and scar contracture between the two groups．Average surgical duration was 46 min in the PGA sheet group and 96 min in the artificial dermis group．There were no patients with postoperative bleeding in either group．Postoperative pain was observed in one patient in the PGA sheet group and five patients in the artificial dermis group．The average time taken for the removal of the sheet was 4.9 days in the PGA sheet group and 5.3 days in the artificial dermis group．The average time taken for food to transit from the oral cavity was 5.9 days in the PGA sheet group and 2.0 days in the artificial dermis group．Scar contracture in patients was milder in the PGA sheet group than that in the artificial dermis group．These findings showed that the use of a PGA sheet and fi brin glue on open wounds after partial glossectomy was useful for reduction of surgical duration，postoperative pain，scar contracture and prevention of postoperative bleeding.

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Among maxillofacial surgeons, a general agreement exists that the therapeutic strategy for intracapsular condylar fractures is conservative, while the treatment of extracapsular fractures of the mandibular condyle is extremely controversial. However, some reports have shown a conservative treatment took a long time before improvement of trismus was seen and deviation of the occlusion remained. An invasive treatment modality results in better anatomy, early functionality, and facilitation of physical therapy. However, extraoral routes to the condyle involve the risk of facial nerve injuries or visible scars. Recently, new instruments have facilitated the use of an intraoral approach, which have usually been used with the aid of an endoscope. A case of reduction and fixation of a medially dislocated condylar fracture is presented which resulted in a good prognosis, and additionally we discuss those patients with condylar fractures who were previously diagnosed and treated in our hospital, as well as previous literature.

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We report a rare case of ductal papilloma in the retromolar minor salivary grand. A 78-year-old female patient visited our hospital with the chief complaint of a mass in the left retromolar region. She had noticed the mass 1 month earlier．MRI and US imaging suggested that the mass had a clear and smooth margin．Ａ clinical diagnosis of ａ benign tumor was made， and the tumor was removed with the patient under local anesthesia．The excised specimen was histologically diagnosed as intraductal papilloma of minor salivary gland．

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