• Imaging Science in Dentistry
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• 제35권2호
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• pp.91-96
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• 2005

Purpose : To investigate the change of bone healing process after endodontic treatment of the tooth with an apical lesion by fractal analysis. Materials and Methods Radiographic images of 35 teeth from 33 patients taken on first diagnosis, 6 months, and 1 year after endodontic treatment were selected. Radiographic images were taken by JUPITER Computerized Dental X-ray $System^{(R)}$. Fractal dimensions were calculated three times at each area by Scion Image $PC^{(R)}$ program. Rectangular region of interest $(30\times30)$ were selected at apical lesion and normal apex of each image. Results : The fractal dimension at apical lesion of first diagnosis $(L_0)$ is $0.940{\pm}0.361$ and that of normal area $(N_0)$ is $1.186{\pm}0.727(p<0.05)$. Fractal dimension at apical lesion of 6 months after endodontic treatment $(L_1)$ is $1.076{\pm}0.069$ and that of normal area $ (N_1)$ is $1.192{\pm}0.055(p<0.05)$. Fractal dimension at apical lesion of 1 year after endodontic treatment $(L_2)$ is $1.163{\pm}0.074$ and that of normal area $(N_2)$ is $1.225{\pm}0.079(p<0.05)$. After endodontic treatment, the fractal dimensions at each apical lesions depending on time showed statistically significant difference. And there are statistically significant different between normal area and apical lesion on first diagnosis, 6 months after, 1 year after. But the differences were grow smaller as time flows. Conclusion : The evaluation of the prognosis after the endodontic treatment of the apical lesion was estimated by bone regeneration in apical region. Fractal analysis was attempted to overcome the limit of subjective reading, and as a result the change of the bone during the healing process was able to be detected objectively and quantitatively.

• Restorative Dentistry and Endodontics
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• 제35권6호
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• pp.436-444
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• 2010

연구목적: 이 연구는 근관치료 전문의에 의해 시행된 비외과적 근관치료의 임상적 성공률을 전향적으로 평가하고, 치료 성공율과 관련된 환자요인과 치아요인의 영향력을 평가하는 것을 목적으로 하였다. 연구 재료 및 방법: 비외과적 근관치료가 이루어진 441개 치아 중 175개의 치아를 1-2년 후 임상적 검진과 방사선촬영을 하였다. 결과: 치근단 방사선 병소의 유무로 평가된 비외과적 근관치료의 성공율은 81.1% 였다. 치아요인 중 재근관치료, 괴사된 치수, 치수병변에서 유래된 치은의 부종 또는 sinus tract, 그리고 치료 전 치근단 병변의 존재는 이변수분석에서 치료성공에 부정적 영향을 미치는 것으로 나타났다 (p < 0.05). 환자요인, 치아요인과 근관충전의 길이를 포함한 단계적 로지스틱 회귀분석에서는 치수병변에서 유래된 치은의 문제 (odds ratio [OR]: 4.4; p = 0.005), 치료 전 치근단 병변의 존재 (OR: 3.6; p = 0.011), 그리고 치근단에서부터 1-2 mm 짧은 근관충전 (OR: 9.6; p = 0.012) 이 치료 실패와 관련된 주요한 요인으로 나타났다. 결론: 치료 전 치근단 병변의 존재뿐만 아니라 치수병변에서 유래된 치은의 부종 또는 sinus tract의 존재는 비외과적 근관치료의 실패에 영향을 줄 수 있는 것으로 나타났다.

• 구강회복응용과학지
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• 제35권3호
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• pp.143-152
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• 2019

목적: 이번 연구의 목적은 치과대학병원 보존과로 근관치료적으로 의뢰된 환자들과 치아들의 특성을 진료기록을 통해 살펴보고 영향을 미치는 요인을 분석하는 것이다. 연구 재료 및 방법: 2017년 1월부터 2018년 12월까지 한 치과대학병원 보존과에 내원한 환자들을 대상으로 환자의 진료기록을 통해 근관치료적으로 의뢰되었던 환자를 취합하였다. 총 1171명의 환자 기록을 분석하였다. 의뢰된 치아의 상태가 근관치료 전인지 근관치료 중인지 또는 근관 충전된 이후인지를 초진 당시의 방사선 사진과 진료기록 내용을 토대로 구분하여 3가지 군으로 정리해서 분석하였다. 결과: 의뢰된 치아들의 69.9%가 상, 하악 제1, 2대구치였다. 이전 기관에서 의뢰된 후 치과대학병원에 내원할 때까지 소요된 일수는 평균 9.03일이었고 의뢰서가 있는 경우가 65.6%였다. 주된 의뢰 이유로는 지속되는 임상 증상(통증, 종창, 누공)이 37.9%로 가장 많았으며 진단의 어려움 16.7%, 근관막힘 13.8%, 높은 해부학적 난이도 11.4% 순이었다. 세부적으로 근관치료 전에 의뢰된 경우에는 진단의 어려움이 많았고 근관치료 중에 의뢰된 경우에는 지속적인 임상 증상과 근관 막힘이 많았다. 근관 충전 후에 의뢰된 경우는 지속되는 임상 증상이 대부분이었다. 결론: 대구치인 경우 지속적인 임상 증상과 근관 막힘이 주된 이유인 비율이 높았고 전치의 경우 치근단 수술과 외상 치료의 비율이 높았다.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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• pp.582.2-582
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• 2001

Black-pigmented bacteria anaerobes have been implicated in the endodontic infections. This group of microorganisms includes Porphyromonas endodontalis, Porphyromonas gingivalis, prevotella intermedia, and Prevotella nigrescens. The organisms display a wide variety of virulence factors that may be pertinent to acute endodontic infections.(omitted)

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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• pp.574.1-574
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• 2001

Maxillary first molar, the "6-year molar", is the tooth largest in volume and most complex in root and root canal anatomy. Therefore, maxillary first molar is possibly the most treated, least understood. It is the posterior tooth with the highest endodontic failure rate and unquestionably one of the most important teeth. The earliest permanent posterior tooth to erupt, the mandibular first molar seems to be the most frequently in need of endodontic treatment.(omitted)

• 대한치과의사협회지
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• 제51권10호
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• pp.556-564
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• 2013

Modern endodontics has essentially changed following the introduction of the dental microscope since 1990's. One of main advantage of using dental microscope in nonsurgical endodontic treatment is enhancing clinician's ability and quality of treatment through illumination and magnification. Scopes of dental microscope in nonsurgical endodontics are finding a missed or additional root canal and a tooth crack, management of procedural errors, and others. These improvements in technology will result in greater confidence in treatment and better success in clinical practice.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2003년도 제120회 추계학술대회 제 5차 한ㆍ일 치과보존학회 공동학술대회
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• pp.580-580
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• 2003

I. Objectives This study investigated the quantity of debris which was extruded apically after canal instrumentation using different types of enlarging instrument in endodontic resin models. II. Materials and Methods Five groups of 9 endodontic resin model were instrumented using each different technique：hand instrumentation without early coronal flaring, hand instrumentation after early coronal flaring, and three nickel-titanium engine-driven instrumentations(Hero 642, Protaper, K3) after early coronal flaring.(omitted)

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2003년도 제120회 추계학술대회 제 5차 한ㆍ일 치과보존학회 공동학술대회
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• pp.606-606
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• 2003

There have been many studies that have evaluated success and failure of endodontic treatment (Nair, Sjogren), but there is remarkably limited information concerning the specific microorganisms that are involved in the teeth with treatment failure. Microorganisms that survive root canal treatment to cause a persistent infection must possess specific characteristics to avoid the host defense. These can be broadly classified as; 1. Sequestration：A physical barrier between the microbe and the host. 2. Cellular evasion：Microorganisms avoid leukocyte dependent antibacterial mechanisms. 3. Humoral evasion：Extracellular bacteria avoid the hosts antibodies and complement.(omitted)

• International Journal of Oral Biology
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• 제38권4호
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• pp.141-147
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• 2013

It has been established that berberine has strong antimicrobial effects. Little is known however regarding the antimicrobial activity of berberine against endodontic pathogenic bacteria or its cytotoxicity in human oral tissue cells. The antibacterial properties of berberine were tested against 5 strains of Enterococcus faecalis and type strains of Aggregatibacter actinomycetemcomitans, Prevotella nigrescens, Prevotella intermedia, and Tannerella forsythia, which are involved in endodontic infections. Antimicrobial activity was evaluated through minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) measurements. The viability of normal human gingival fibroblast (NHGF) cells after exposure to berberine was measured using a methyl thiazolyl tetrazolium (MTT) assay. The data showed that berberine has antimicrobial effects against A. actinomycetemcomitans with an MIC and MBC of $12.5{\mu}g/ml$ and $25{\mu}g/ml$, respectively. In the cytotoxicity studies, cell viability was maintained at 66.1% following exposure to $31.3{\mu}g/ml$ berberine. Overall, these findings suggest that berberine has antimicrobial activity against the tested bacteria. Nevertheless, lower concentrations in combination with other reagents will need to be tested before these in vitro results can be translated to clinical use.

• Restorative Dentistry and Endodontics
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• 제44권4호
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• pp.44.1-44.11
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• 2019

Objectives: To compare the flexural cyclic fatigue resistance and the length of the fractured segments (FLs) of recently introduced M-Pro rotary files with that of RaCe rotary files in curved canals and to evaluate the fracture surface by scanning electron microscopy (SEM). Materials and Methods: Thirty-six endodontic files with the same tip size and taper (size 25, 0.06 taper) were used. The samples were classified into 2 groups (n = 18): the M-Pro group (M-Pro IMD) and the RaCe group (FKG). A custom-made simulated canal model was fabricated to evaluate the total number of cycles to failure and the FL. SEM was used to examine the fracture surfaces of the fragmented segments. The data were statistically analyzed and comparisons between the 2 groups for normally distributed numerical variables were carried out using the independent Student's t-test. A p value less than 0.05 was considered to indicate statistical significance. Results: The M-Pro group showed significantly higher resistance to flexural cyclic fatigue than the RaCe group (p < 0.05), but there was no significant difference in the FLs between the 2 groups (p ≥ 0.05). Conclusions: Thermal treatment of nickel-titanium instruments can improve the flexural cyclic fatigue resistance of rotary endodontic files, and the M-Pro rotary system seems to be a promising rotary endodontic file.