ISSN : 0376-4672
The aim of this study was to analyze the influence of implant location on the prevalence of peri-implantitis by within-subjects comparison of healthy and peri-implantitis affected implants in patients with peri-implantitis. To be included for this study, the patient should have at least one peri-implantitis affected implant and one healthy implant. Following clinical and radiographic assessments for peri-implantitis, 56 patients with 89 peri-implantitis affected implants and 249 healthy implants were included in this study. Influences of implant location variables including jaw position, tooth type, tooth position, and tooth adjacent to the implant on the prevalence of peri-implantitis were assessed using a multilevel analysis. Implants placed in the maxillary jaw showed 2 times higher frequency of peri-implantitis than those placed in the mandibular jaw. Implants with absence of adjacent tooth were twice more likely to be affected by peri-implantitis than those with presence of an adjacent tooth. Sub-group analysis for the combination of jaw and position variables revealed that implants in the maxillary anterior position showed significantly higher prevalence rate of peri-implantitis than those in the mandibular anterior position. Within limitations of the present study, patients showed significant increase in the prevalence rate of peri-implantitis when the implant was placed in the maxillary jaw or when tooth adjacent to the implant was absent. In addition, the presence of tooth seemed to provide positive effect on the occurrence of peri-implantitis at the adjacent implant.
말초안면신경마비는 가장 흔한 뇌신경 질환 중 하나이다. 말초안면신경마비의 병인은 외상, 감염, 특발성원인 등으로 다양하며, 드문 경우로 발치를 포함한 치과치료 중에 말초안면신경마비가 일어날 수 있다. 증상의 발생시점과 지속기간에 따라 안면마비는 즉시형과 지연형으로 나눌 수 있으며 즉시형의 경우 좀 더 흔하게 발생하며 대개 국소마취제의 주입과 관련이 있다. 그러나 안면마비의 발생시점과 증상이 지연되는 경우 병인론을 파악하는 것은 더욱 어렵다. 본 증례는 발치 후 발생한 지연형 안면신경 마비에 대한 소개로서 환자의 경우 발치 후 5일 뒤에 증상이 발생하여 약 1달간 증상이 지속되었다. 국내에서는 매우 드문 일로 증례보고와 함께 관련 문헌을 고찰하고자 한다.
Peripheral facial nerve palsy is one of the most common cranial nerve disease. There can be multiple etiologies including trauma, infection, idiopathic conditions. In rare case, during dental treatment including extraction, peripheral facial palsy also can occur. Based on the time of onset and duration of the symptom, facial palsy could be classified on immediate or delayed. Immediate facial palsy is relatively common and mainly associated with the injection of local anesthetic. However, in case that onset of facial palsy and symptom are delayed, it is difficult to determine the pathogenesis. We report a rare case of delayed facial palsy as a complication of tooth extraction, which occurred 5 days after the tooth extraction and subsided in about 1 month and discuss the possible etiology and management.
The conventional principle of root canal obturation is to make the gutta percha(GP) ratio high and the sealer ratio low. Many studies suggested that continuous wave technique(CWT) was superior to cold lateral compaction(CLC) in teeth with complex anatomical structures, but CWT also has many disadvantages. With the recent development of the calcium silicate based sealer(CSS), single cone technique(SCT) is back in the spotlight as a root canal obturation technique. Due to the advantages of clinical convenience, many dentists obturate root canal by SCT. When obturating the root canal by SCT, it is likely that the quality of the root canal obturation will decrease as compared to CLC or CWT depending on tooth anatomic complexities, and it is difficult to remove the CSS from root canals in the cases of retreatment. Therefore, it is recommended to be careful in selecting case when obturating the root canal by SCT.
Contemporary dentin adhesives show reliable adhesion performance regardless of their adhesion protocol. It is mostly attributed to the improved chemical composition of them. However, their performance can be also improved by various clinical techniques. “Agitation” is the most important technique among them. It is easiest and most useful technique in clinic. In addition, it can be used to all dentin adhesives. This manuscript describes various evidence for the agitation and provides its clinical guidance.
It had been a common belief that the primary cause of failure of endodontically treated teeth depends on the quality of the root canal treatment. Disinfection of root canals via cleaning and shaping is the most important to resolve the periapical lesion, however, following coronal restoration of endodontically treated teeth is also considerably significant to rehabilitate the teeth, and to prevent the re-infection of root canal system. In the clinical situation, the importance of post-endodontic restoration including the removal of residual caries and unfavorable previous restoration, and following adequately performed dentin adhesion and core restoration seems to be passed over because it did not show the immediate complications of postoperative hypersensitivity. A post-endodontic coronal restoration aims to prevent micro-leakage and subsequent bacterial ingress and contamination of the root canal complex. Thus, the choice of materials and methods, and the quality for post-endodontic restoration may influence the durability and prognosis of the teeth. In this article, the various considerations in the management of post-endodontic restoration and recent advance in restorative materials will be reviewed.
