• Restorative Dentistry and Endodontics
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• 제8권1호
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• pp.155-159
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• 1982

The author has studied comparatively the sealing quality of conventional Z.O.E. cement, chloropercha and FR cement by means of penetration of 2% methylene blue solution through the apex of human teeth in 112 cases as the time elapsed. The results were as follows; 1. All the specimen, of which dye immersion time is three days, showed dye penetration of low degree unrelated to the kinds of root canal cement and the degree of dye penetration was increased as the time elapsed. 2. Of all the experimental group, the Z.O.E. cement group showed the lowest degree of dye penetration and the FR filling group showed the highest degree of dye penetration. 3. The degree of dye penetration of FR cement group was higher than that of the Z.O.E. cement group but lower than that of the chloropercha group.

• Journal of Korean Dental Science
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• 제14권2호
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• pp.61-68
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• 2021

Purpose: The aim of this study was to investigate the outcomes of endodontic treatment of mandibular second molar with C-shaped canal in elderly patients and related factors affecting the survival of the tooth. Materials and Methods: From 2010 to 2015, the survival rate following endodontic treatment was evaluated in elderly patients over 60 years who visited the Veterans Health Service Medical Center for endodontic treatment. The presence of C-shaped canals was confirmed using clinical records and radiographic features. Patient's age, sex, systemic diseases, tooth location, vitality, signs and symptoms, fractures, caries, apical radiolucency, canal shaping methods, sealer leakage, filling voids, and restoration of prosthesis were included in the analyses as confounding variables. The survival rate of teeth was analyzed using Kaplan-Meire analysis and the relationship between the survival rate and variables was analyzed using Simple and Multiple Cox regression analysis. Result: In total, 107 teeth in elderly patients had C-shaped canal. The survival rate of teeth that received endodontic treatment was 63.70%. None of the factors investigated significantly influenced the survival rate (P>0.05). Conclusion: In elderly patients with C-shaped canal, the survival rate after root canal treatment was not significantly different from that of other mandibular molars.

• Restorative Dentistry and Endodontics
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• 제38권3호
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• pp.119-127
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• 2013

The purpose of a root-end filling is to establish a seal between the root canal space and the periradicular tissues. As root-end filling materials come into contact with periradicular tissues, knowledge of the tissue response is crucial. Almost every available dental restorative material has been suggested as the root-end material of choice at a certain point in the past. This literature review on root-end filling materials will evaluate and comparatively analyse the biocompatibility and tissue response to these products, with primary focus on newly introduced materials.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 춘계학술대회
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• pp.257-257
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• 2001

Failures occur in dentistry as a result of manny factors some of which can be controlled by the operator whilst others are unavoidable. The long-term success rate of endodontic treatment has often been thought to be very high although studies reported in the literature do not support this perception. The number of failure can be reduced by adhereing to accepted treatment procedures and by avoiding 'short cut'. Endodontic disaters are usually related to operator errors and they mat have detrimental effects on the outcome of treatment in the long term, eventually becoming catastrophes. Endodontic disasters will require special techniques to salvage them whereas catastrophes usually result in loss of the tooth and every effort should be made to prevent such problems from occurring. This presentation will cover common errors in endodontic procedures especially access opening, canal negotiation, canal irrigation, canal preparation, canal filling, post preparation.ration.

• 대한소아치과학회지
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• 제48권2호
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• pp.198-208
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• 2021

이 연구의 목적은 키토산 첨가 수산화칼슘 근관 충전재의Enterococcus Faecalis에 대한 항균 효과 및 물리적 성질을 알아보는 것이다. 저, 중, 고분자량의 키토산 분말을 수산화칼슘 근관 충전재와 혼합하였고, 각 분자량 별로 키토산 분말을 1.0, 2.0, 5.0 wt%로 첨가하였다. E. faecalis를 배양하여 1 × 10⁶ CFU/ml로 조정하였다. 항균 효과 실험을 위해 2.0 wt% 키토산의 3가지 다른 분자량, 3가지 다른 농도의 고분자량 키토산을 수산화칼슘 근관 충전재와 혼합하였다. 기준 파장 600 nm인 570 nm에서 분광광도계를 이용하여 상층액의 흡광도를 측정하였다. 유동성, 피막도 및 방사선 불투과성은 ISO 6876 : 2012에 의거하여 측정하였다. 키토산을 포함하는 모든 분자량 유형의 실험군은 키토산을 첨가하지 않은 대조군에 비해 E. faecalis 성장 억제 효과를 보였다. 고분자량 키토산 첨가 군에서 가장 좋은 항균 효과를 보였다(p < 0.05). 또한 키토산 첨가량이 감소할수록 항균 효과도 감소하였다(p < 0.05). 키토산을 함유하는 수산화칼슘 근관 충전재의 모든 분자량 군은 키토산 함량의 증가 따라 유동성 및 방사선 불투과성이 감소하고 피막도가 증가하는 경향을 보였다. 1.0 wt% 저분자량 키토산의 첨가는 기존 수산화칼슘 근관 충전재와 비교하여 물성에 큰 차이를 보이지 않았다. 연구 결과를 종합하였을 때, 수산화칼슘 근관 충전재에 첨가하여 항균성 강화와 적절한 물성을 얻기 위해선 2.0 wt%의 키토산 분말의 첨가가 적정하다. 키토산의 항균 효과를 고려할 때, 키토산의 근관 치료 및 소아치과 분야에서의 적용을 위한 추가적인 연구가 필요할 것으로 사료되었다.

• Restorative Dentistry and Endodontics
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• 제49권1호
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• pp.5.1-5.11
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• 2024

Objectives: This study aimed to present the results and analyses of clinical trials, including updates on the different functions of root canal sealers. Materials and Methods: In June 2023, we performed a comprehensive search of ClinicalTrials.gov to identify interventional clinical trials pertaining to root canal sealers. In total, 23 clinical trials conducted up to June 2023 were included in this study. Results: Approximately half of the trials (11 out of 23) were completed, while none were terminated or withdrawn. Each included trial had a minimum of 10 participants, with 11 trials having more than 100 participants. None of the assessed trials provided outcomes, and the majority (17 out of 23) lacked associated publications. In terms of geographic distribution, the USA and Canada did not contribute to any root canal sealer trials. Conclusions: This study highlights the lack of diversity in trial locations, the absence of reported results, and a scarcity of clinical trials examining the physicochemical properties of different sealers. Most published trials primarily focused on assessing the post-operative pain effect of these sealers, but no significant difference was found regarding post-operative pain control.

• Restorative Dentistry and Endodontics
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• 제23권2호
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• pp.561-574
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• 1998

본 연구는 근관형성시 생성되는 도말층의 존재가 System-B를 이용한 가온 수직가압충전 후의 미세누출에 미치는 영향을 관찰하고자 시행되었다. 최근에 발거된 20개의 상악전치를 이용하여 Ni-Ti 전동화일의 한 종류인 Quantec series 2000$^{TM}$(Tycom, USA) 과 수통 K-화일로 근관형성시 생성되는 도말층의 차이와 EDTA 용액 및 EDTA/차아염소산나트륨 용액의 2종 세척액에 따른 도말층의 제거양상을 주사전자현미경으로 관찰하였다. 44개의 상악전치를 이용하여 System-B를 이용한 가온 수직가압충전후의 미세누출의 정도를 근관형성시 생성되는 도말층의 존재유무에 따라 색소침투법과 치아투명화법을 이용하여 비교한 결과 다음과 같다. ${\cdot}$ 수동 K-화일이나 전동 Ni-Ti 화일로 근관형성한 군 모두에서 EDTA 용액을 사용한 군은 도말층이 완전히 제거되어 상아세관이 깨끗하게 개방되었지만, 차아염소산나트륨 용액만 사용한 군은 근관의 대부분이 도말층으로 덮혀 있었고 개방된 상아세관은 발견할 수 없었다. ${\cdot}$ 수동 K-화일 군과 전동 Ni-Ti 화일 군 사이에는 생성된 도말층의 차이를 관찰할 수 없었다. ${\cdot}$ EDTA 용액을 이용하여 도말층을 제거한 경우와 차아염소산나트륨 용액만을 사용한 경우간의 비교에서는, sealer를 사용했을 때에는 도말층을 제거한 경우가 유의하게 적은 색소 침투를 나타냈으며(p<0.01), sealer를 사용하지 않았을 때에는 EDTA 용액과 차아염소산나트륨 용액으로 세척한 경우가 다소 적은 색소 침투를 나타냈으나 통계적 유의성은 없었다(p>0.05). ${\cdot}$ EDTA 용액를 이용하여 도말층을 제거한 후 sealer사용 유무에 따른 비교에서는 sealer를 사용한 경우에서 통계적으로 유의하게 적은 색소침투를 나타냈다(p<0.01). ${\cdot}$ EDTA 용액을 사용하지 않고 차아염소산나트륨 용액만으로 근관형성한 후 sealer사용 유무에 따른 비교에서는 sealer를 사용한 경우에서 통계적으로 유의하게 적은 색소 침투를 보였다(p<0.01).

• Imaging Science in Dentistry
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• 제52권3호
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• pp.245-258
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• 2022

Purpose: This study compared the root canal anatomy between cone-beam computed tomography (CBCT) and micro-computed tomography (micro-CT) images before and after biomechanical preparation and root canal filling. Materials and Methods: Isthmus-containing mesial roots of mandibular molars(n=14) were scanned by micro-CT and 3 CBCT devices: 3D Accuitomo 170 (ACC), NewTom 5G (N5G) and NewTom VGi evo (NEVO). Two calibrated observers evaluated the images for 2-dimensional quantitative parameters, the presence of debris or root perforation, and filling quality in the root canal and isthmus. The kappa coefficient, analysis of variance, and the Tukey test were used for statistical analyses(α=5%). Results: Substantial intra-observer agreement (κ=0.63) was found between micro-CT and ACC, N5G, and NEVO. Debris detection was difficult using ACC (42.9%), N5G (40.0%), and NEVO (40%), with no agreement between micro-CT and ACC, N5G, and NEVO (0.05<κ<0.12). After biomechanical preparation, 2.4%-4.8% of CBCT images showed root perforation that was absent on micro-CT. The 2D parameters showed satisfactory reproducibility between micro-CT and ACC, N5G, and NEVO (intraclass correlation coefficient: 0.60-0.73). Partially filled isthmuses were observed in 2.9% of the ACC images, 8.8% of the N5G and NEVO images, and 26.5% of the micro-CT images, with no agreement between micro-CT and ACC, and poor agreement between micro-CT and N5G and NEVO. Excellent agreement was found for area, perimeter, and the major and minor diameters, while the roundness measures were satisfactory. Conclusion: CBCT images aided in isthmus detection and classification, but did not allow their classification after biomechanical preparation and root canal filling.

• Restorative Dentistry and Endodontics
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• 제9권1호
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• pp.51-57
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• 1983

64 multi-rooted teeth (198 canals) were tested in vitro to evaluate the apical seal produced by the single cone filling and lateral condensation with sealer and without sealer. The obturated teeth were immersed in India ink, decalcified, and cleared. The degree of ink penetrated into the canal provided a measure of the apical seal. The results were as follows: 1. The lateral condensation with sealer provided statically less apical leakage than the other obturating techniques used in this study. 2. The single cone filling provided good apical sealing. 3. The lateral condensation without sealer provided most apical leakage than any other techniques used in this study. 4. The degree of apical leakage was not related to the visual appearence of the adaptation of the gutta percha filling in cleared teeth.

• 대한치과의사협회지
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• 제55권8호
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• pp.556-564
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• 2017

Endodontic surgery is a procedure to treat apical periodontitis or abscess in cases that did not heal after nonsurgical treatment or retreatment. This might include situations with persistent intracanal infection after root canal treatment. Other reasons might be found in extraradicular infection, such as bacterial biofilm on the apical root surface or bacteria within the lesion. For many years, the treatment standard was the traditional approach with surgical burs and amalgam for root-end filling. Endodontic microsurgery is the most recent step in the evolution of endodontic surgery, applying not only ultrasonic tip and biocompatible filling materials but also incorporating high-power magnification and illumination. Although many studies have been published that advocate the use of modern technique, the traditional techniques are still widely used in the surgery community. The purpose of this study was to demonstrate the endodontic microsurgery procedure including the root-end preparation and filling with the use of a surgical operating microscope.