• Restorative Dentistry and Endodontics
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• 제28권4호
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• pp.303-313
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• 2003

It has been documented that periodontopathic bacteria are also implicated in endodontic infections. 168 rDNA gene-directed PCR was to examine the prevalence of periodontopathic bacteria including Actinobacillus actinomycetemcomitans (Aa), Prevotella intermedia (Pi), Prevotella nigrescens (Pn), Porphyromonas gingivalis (Pg), Porphyromonas endodontalis (Pe), and Treponema denticola (Td) in the root canals of 36 endodontically infected teeth having apical lesions with or without clinical symptoms like pain, swelling, and fistula. 1. In 36 infected root canals, most frequently detected bacterial species was Pg (61.1%), followed by Td (52.8%) and Pe (38.9%). 2. Of 36 infected root canals, Aa was detected in 6 canals (16.7%) of the teeth, all of which showed clinical symptoms. 3. Of 36 infected root canals, Pi and Pn were found in 4 03.9%) and 5 (33.3%), respectively. Notably, prevalence of Pn in the symptomatic teeth was 50.0%. 4. One of black-pigmented anaerobic bacteria (BPB) including Pi, Pn, Pe, and Pg was detected in all of the teeth that showed pain or especially swelling but not fistula. It was, however, found that prevalence of BPB in the asymptomatic teeth or the teeth with fistula was only 40%. 5. Pe and Pg were detected in the teeth regardless of the presence or absence of symptoms. 6. Td was detected in the teeth regardless of the presence or absence of symptoms. High prevalence of BPB in the symptomatic teeth but low in the asymptomatic teeth suggests that BPB may play an important role in the pathogenesis of periapical lesions.

• Restorative Dentistry and Endodontics
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• 제18권2호
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• pp.463-468
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• 1993

The purpose of this study was to evaluate the effects of Vitapex on the periapical lesions. Thirteen single-rooted teeth from ten patients who visited the SNU hospital were endodontically treated with Vitapex and Gutta percha cone, and radiographically and clinically evaluated for a period of 1 to 6 months. The results were as follows : 1. The loss of clinical symtoms was observed in all 13 teeth. 2. The reduction of size of periapical lesions in radiographs was observed in 10 teeth. The periapical lesions of remaining 3 teeth also look better in the radiographs. 3. All 13 teeth showed the reduction of radiolucency. 4. The gradual resorption of Vitapex over the root apex was observed.

• 대한소아치과학회지
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• 제23권4호
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• pp.937-945
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• 1996

Nitrous oxide has acquired widespread use as a tool for management of anxious and comprehensive pediatric dental patients. Clinical impressions have suggested that inhalation sedation with $N_2O/O_2$ reinforces the effect of other sedatives. Fifteen uncooperative children, mean age of 37months, who were regarded as fail in the first treatment using chloral hydrate-hydroxyzine orally, midazolam orally or intranasally, were sedated with the same sedatives in conjunction with $N_2O/O_2$. All the children were restrained in a pediwrap and were monitored with pulse oximeter for their heart rate and oxygen saturation. Degree of sleep, crying and movement were evaluated. The clinical results indicated that a satisfactory level of sedation was achieved in approximately two thirds of the cases (about 66 %) under those sedation manner. Complications were rare and those of treatments were successfully completed without difficulty.

• 대한치과의사협회지
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• 제57권1호
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• pp.26-33
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• 2018

Panoramic radiography is widely used as a primary radiological diagnosis in dentistry. However, due to the overlapping of anatomical structures, diagnostic capability of panoramic radiography is limited. Recently, panoramic machine equipped with various image processing software has been introduced to improve the diagnostic capability. This study aims to introduce panoramic equipment with multi-layer imaging software that can provide 41 images from anterior to posterior in region of interest, and to report in various clinical applications.

• Journal of Korean Dental Science
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• 제17권2호
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• pp.75-83
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• 2024

Stevens-Johnson syndrome (SJS) is a severe adverse cutaneous drug reaction seen rarely in clinical practice. Although relatively rare, the condition can be fatal. Mainly, it is caused by side effects of certain medications. Previous reports have associated Stevens-Johnson syndrome with abnormal root development, but the other long-term dental complications have rarely been reported. In this case, the patient developed SJS at the age of 5, and abnormal root development of the maxillary and mandibular first molars and mandibular incisors was observed, as well as impaction of the mandibular canine and enamel hypomineralization of multiple teeth. Accordingly, appropriate restorative treatment and orthodontic treatment were performed, and the clinical characteristics of this symptoms and its treatment were discussed in more detail. We aim to highlight the need for dentists to be aware of the potential dental complications of SJS and to enable early diagnosis and management of the condition to avoid undesirable sequelae.

• 대한소아치과학회지
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• 제38권1호
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• pp.17-24
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• 2011

미성숙 영구 전치에서 MTA를 이용한 치근단 형성술의 예후를 평가하기 위해, 영구 전치의 외상으로 MTA를 이용한 치근단 형성술을 받은 환자 중 최소 3개월 이상의 경과 관찰이 시행된 환자 49명, 치아 64개의 의무기록과 방사선 사진을 검토하였다. 환자 정보, 치아 및 치주조직 외상 위치와 유형, 치료 전 치근단 병소 유무, 임상 증상 유무, MTA 충전 상태, 치근단 형성술 이후 치근단 병소 치유 및 치근단 경조직 장벽 형성 여부를 조사하고, 임상적, 방사선학적 성공을 평가하여 다음과 같은 결과를 얻었다. 1. 64개의 미성숙 영구전치에 시행된 MTA를 이용한 1-visit 치근단 형성술은 89.1%의 임상적 성공률과 73.4%의 방사선학적 성공률을 보였다. 2. 상악 치아와 하악 치아에 행해진 MTA를 이용한 1-visit 치근단 형성술 비교시 상악에서 유의하게 더 높은 성공률을 보였다. 3. 치아 외상 및 치주조직 외상 유형에 따른 성공률은 유의한 차이를 보이지 않았다. 4. MTA의 적절한 충전 여부는 성공률에 영향을 미치지 않았다.

• Restorative Dentistry and Endodontics
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• 제39권2호
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• pp.79-88
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• 2014

Appropriate use of local hemostatic agent is one of the important factors on the prognosis of endodontic microsurgery. However, most investigations to date focus on the hemostatic efficacy of the agents, whereas their biologic characteristics have not received enough attention. The purpose of this paper was to review the biologic response of local hemostatic agents, and to provide clinical guidelines on their use during endodontic microsurgery. Electronic database (PUBMED) was screened to search related studies from 1980 to 2013, and 8 clinical studies and 18 animal studies were identified. Among the materials used in these studies, most widely-investigated and used materials, epinephrine, ferric sulfate (FS) and calcium sulfate (CS), were thoroughly discussed. Influence of these materials on local tissue and systemic condition, such as inflammatory and foreign body reaction, local ischemia, dyspigmentation, delayed or enhanced bone and soft tissue healing, and potential cardiovascular complications were assessed. Additionally, biological property of their carrier materials, cotton pellet and absorbable collagen, were also discussed. Clinicians should be aware of the biologic properties of local hemostatic agents and their carrier materials, and should pay attention to the potential complications when using them in endodontic microsurgery.

• Restorative Dentistry and Endodontics
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• 제42권3호
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• pp.157-167
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• 2017

This systematic review aims to summarize the current clinical studies that investigated survival rates against fracture of endodontically treated posterior teeth restored with crowns or resin composite restorations. Literature search were performed using keywords. Publications from 1980 to 2016 were searched in PubMed, ScienceDirect, ISI Web of SCIENCE, MEDLINE, and SCOPUS. Included studies were selected based on inclusion and exclusion criteria. Three clinical studies were included: 1 randomized controlled trial and 1 prospective and 1 retrospective cohort studies. Pooled survival rates ranged from 94%-100% and 91.9%-100% for crowns and resin composite, respectively. The majority of teeth had no more than 3 surface loss of tooth structure. The studies included were heterogeneous, and were not appropriate for further meta-analysis. Current evidence suggested that the survival rates against the fracture of endodontically treated posterior teeth restored with crowns or resin composites were not significantly different in the teeth with minimum to moderate loss of tooth structure.

• 대한치과의사협회지
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• 제56권3호
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• pp.152-158
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• 2018

Polyaryletherketone (PAEK) is recently introduced in dentistry. The polymer has superior mechanical and chemical properties compared to previous dental materials. PAEK has been explored for lots of applications for clinical dentistry. The prostheses can be made by the injection molding or milling techniques. Recent studies focus on improving the bioactivity of PAEK and expanding the application. The purpose of this article is to introduce the basic features, chemical structure and various clinical applications in fixed dental prostheses. Further research and clinical trials will be needed to confirm the usability of PAEK in the routine practice.

• 대한치과의사협회지
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• 제45권3호통권454호
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• pp.169-181
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• 2007

In this second part of series report on evidence-based dentistry, the level of evidence and the methods for critical appraisal are discussed. The epidemiologic studies, namely clinical studies have some bias per se, and the degree of bias is somewhat predetermined by the study design. The level of evidence can be defined as the reliability of the clinical study and it is dependent on the degree of bias. Thus, it is important to determine the type of the study and to understand its structure before critically appraising them. Systematic reviews of primary studies, randomized controlled trials, nonrandomized clinical trials, cohort studies, case-control studies, and case reports / series constitute the clinical studies and the level of evidence follows the order of the studies listed above. Critical appraisal is the most important procedure in evidence-based dentistry. It is done to determine the credibility of research papers and their usefulness in the clinician s own practice. Critical appraisal is consisted of multiple questions that are helpful for evaluating validity and usefulness of the studies concerning therapy, diagnosis, prognosis, and causation.