치수/치근단 질환에 이환된 영구치의 치수 조직 재생과 치근 형성

유연지,백승호,손호현 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.4

최근 치수 질환 또는 치근단 질환을 가진 미성숙 영구치에 대한 보존적 치료의 방법으로 여러가지 근관 내 소독 약제를 이용하에 증상 개선은 물론 치근의 성장 및 치수의 재생이 이루어진 증례들이 보고되고 있다. 그 기전에 대해서는 아직 명확하게 밝혀지지는 않았지만 여러가지 줄기 세포 또는 미분화 간엽 세포들이 관여하는 것으로 생각되며, 실제로 재생된 조직에서는 대부분백악질양또는골양물질의 침착이 관찰되고 있다. 이 새롭고보존적인 치료접근 방법은 다능성 줄기 세포와 다양한조직 공학 기술에 대한 연구와 더불어, 재생적 근관 치료에 더 밝은 비전을 제시하고 있다. Numerous cases about additional growth of roots or pulp tissue regeneration by using various intracanal medicaments in immature permanent teeth with periapical or pulpal disease have been reported. The underlying mechanism has not been clearly delineated. but it has been widely accepted that undifferentiated mesenchymal cells and stem cells are involved. Moreover, the growth and deposition of osteoid or cementoid tissues have been observed in regenerated pulp and roots. This new and non-invasive treatment has brightened the future of endodontics. and enlarged the vision of regenerative root canal treatment with multi-potent stem cells and various tissue engineering techniques.

최신 근관 세척 방법과 기구에 대한 고찰

유연지,신수정,백승호 大韓齒科保存學會 2011 Restorative Dentistry & Endodontics Vol.36 No.3

서론: 근관 치료의 성공을 위해 근관계 내에 남아있는 조직 잔사와 박테리아를 제거하는 것은 매우 중요하다. 그러나 충분한 근관 형성과 근관 세척을 하더라도 근관의 복잡한 형태로 인하여 근관 내 박테리아의 biofilm이나 괴사된 치수 조직이 남아 있게 된다. 근래 보다 효과적으로 근관 세척을 하기 위한 여러 가지 방법과 근관 세척을 위한 기구들이 개발되었다. 본 종설에서는 근관 치료 영역에서 사용되는 근관 세척 방법과 기구에 대해 고찰하고자 한다. 본론: 아래와 같은 기구와 방법이 논의된다. - syringe-needle irrigation, manual dynamic irrigation, brushes - sonic and ultrasonic irrigation, passive ultrasonic irrigation, rotary brush, RinsEndo, EndoVac, Laser 결론: 최근 근관 세척을 위한 기구와 세정 방법이 개발되었으나, syringe와 needle을 이용한 근관 세척법과 ultrasonic을 이용한 근관 세척법을 제외하고는 새로 개발된 많은 기구들의 임상적 치료 결과의 향상에 대한 근거 중심 연구가 아직은 부족하며, 어떠한 기구나 장치도 근관 내 잔사를 완벽하게 제거할 수는 없다. 효과적인 근관 세척을 위해서는 적절한 근관 세척제의 선택과 함께, 근관 세척제를 근관장까지 충분한 양이 도달할 수 있도록 적절한 근관 세척 기구와 방법을 선택하여야 한다. Introduction: Eliminating the residual debris and bacteria in the root canal system is one of the main purposes of the endodontic treatment. However, the complexity on the anatomy of the root canal system makes it difficult to eliminate the bacterial biofilm existing along the root canal surface and necrotic pulp tissue by mechanical instrumentation and chemical irrigation. Recently, more effective irrigant delivery systems for root canal irrigation have been developed. The purpose of this review was to present an overview of root canal irrigant delivery techniques and devices available in endodontics. Review: The contents of this paper include as follows; - syringe-needle irrigation, manual dynamic irrigation, brushes - sonic and ultrasonic irrigation, passive ultrasonic irrigation, rotary brush, RinsEndo, EndoVac, Laser Conclusion: Though technological advances during the last decade have brought to fruition new agitation devices that rely on various mechanisms, there are few evidence based study to correlate the clinical efficacy of these devices with improved outcomes except syringe irrigation with needle and ultrasonic irrigation. The clinicians should try their best efforts to deliver antimicrobial and tissue solvent solutions in predictable volumes safely to working length.

부부의 원가족 특성과 고부․옹서 갈등이 결혼만족도에 미치는 영향

유연지,조현주,권정혜 한국여성심리학회 2008 한국심리학회지 여성 Vol.13 No.4

The Purpose of this study was to determine effects of family-of-origin characteristic and conflicts with in-laws on marital satisfaction. For this purpose, the Family System Diagnosis Scale(FSDS), Conflicts between Mother-in-law and Daughter-in-law scale(CBMD), Conflicts Between Mother-in-law and Son- in-law scale(CBMS), and the Korean Marital Satisfaction Inventory scale(K-MSI) were administrated to 274 married couples, and data were analyzed using stepwise regression and structural equation modeling. First, husband's family-of-origin characteristic was significant variables that explained marital satisfaction. However, wife's family-of-origin characteristic was not significant variables that explained marital satisfaction. Second, wife's family-of-origin characteristic was significant variables that explained conflicts between mother-in-law and son-in-law. Moreover, conflicts between mother-in-law and son-in-law was significant variables that explained husband's marital satisfaction. Third, husband's family-of-origin characteristic was significant variables that explained conflicts between mother-in-law and daughter-in-law. These results indicated that husband's family-of-origin characteristic had significant path on husband's marital satisfaction. However, this path was not significant for wife. In addition, conflicts in-laws and marital satisfaction had significant path when family-of-origin characteristic was mediated. Implications and suggestions for future research were discussed.

Multivariate analysis of the cleaning efficacy of different final irrigation techniques in the canal and isthmus of mandibular posterior teeth

유연지,이우철,김현철,손원준,백승호 대한치과보존학회 2013 Restorative Dentistry & Endodontics Vol.38 No.3

Objectives: The aim of this study was to compare the cleaning efficacy of different final irrigation regimens in canal and isthmus of mandibular molars, and to evaluate the influence of related variables on cleaning efficacy of the irrigation systems. Materials and Methods: Mesial root canals from 60 mandibular molars were prepared and divided into 4 experimental groups according to the final irrigation technique:Group C, syringe irrigation; Group U, ultrasonics activation; Group SC, VPro StreamClean irrigation; Group EV, EndoVac irrigation. Cross-sections at 1, 3 and 5 mm levels from the apex were examined to calculate remaining debris area in the canal and isthmus spaces. Statistical analysis was completed by using Kruskal-Wallis test and Mann-Whitney U test for comparison among groups, and multivariate linear analysis to identify the significant variables (regular replenishment of irrigant, vapor lock management, and ultrasonic activation of irrigant) affecting the cleaning efficacy of the experimental groups. Results: Group SC and EV showed significantly higher canal cleanliness values than group C and U at 1 mm level (p < 0.05), and higher isthmus cleanliness values than group U at 3 mm and all levels of group C (p < 0.05). Multivariate linear regression analysis demonstrated that all variables had independent positive correlation at 1 mm level of canal and at all levels of isthmus with statistical significances. Conclusions: Both VPro StreamClean and EndoVac system showed favorable result as final irrigation regimens for cleaning debris in the complicated root canal system having curved canal and/or isthmus. The debridement of the isthmi significantly depends on the variables rather than the canals. (Restor Dent Endod 2013;38(3):154-159)

Endodontic biofilms: contemporary and future treatment options

유연지,Hiran Perinpanayagam,오소람,A Reum Kim,한승현,금기연 대한치과보존학회 2019 Restorative Dentistry & Endodontics Vol.44 No.1

Apical periodontitis is a biofilm-mediated infection. The biofilm protects bacteria from host defenses and increase their resistance to intracanal disinfecting protocols. Understanding the virulence of these endodontic microbiota within biofilm is essential for the development of novel therapeutic procedures for intracanal disinfection. Both the disruption of biofilms and the killing of their bacteria are necessary to effectively treat apical periodontitis. Accordingly, a review of endodontic biofilm types, antimicrobial resistance mechanisms, and current and future therapeutic procedures for endodontic biofilm is provided.

만 4세 유아의 야간수면시간에 영향을 미치는 변인분석

유연지,김진욱 육아정책연구소 2018 육아정책연구 Vol.12 No.3

The study aims to investigate nocturnal sleep duration in 4-year-olds and relative effects of various factors including the personal factor (temperament), the familial factor (mother’s employment status), the time-use factors (hours spent in childhood educare institutions, on napping in the institutions, and on using electronic media). The data of 937 4-year-olds collected by the Korea Children and Youth Panel Survey in 2012 was analyzed. Using SPSS 21.0 program, frequency analysis, descriptive statistics, Pearson’s correlation analysis and hierarchical regression were conducted. The results are as follows. First, there were significant negative correlations among the personal factor, familial factor and time-use factors. Finally, the time-use factors showed largest explanatory power on variance of children’s nocturnal sleep duration, followed by the familial factor. But the personal factor was not statistically significant. These results suggested that parents and childhood educare institutions need to cooperate in order for children to sleep well. It is also necessary to implement and spread the social systems to support healthy development of children. 본 연구는 2012년 전국 규모로 실시된 5차 한국아동패널의 자료를 활용하여 만 4세 유아의 개인적 특성요인(기질), 가족특성변인(모 취업여부), 생활시간변인(육아지원기관 이용시간, 기관에서의 낮잠시간, 전자매체 사용시간)이 유아의 야간수면시간에 어떠한 영향을 미치는지와 가장 높은 설명력을 가지는 변인이 무엇인지 살펴보고자 하였다. 그 결과, 유아의 개인적 특성변인, 가족특성변인, 생활시간변인이 야간수면시간과 부적 상관관계가 있는 것으로 나타났다. 상대적 설명력은 생활시간변인, 가족특성변인 순으로 높았으며 개인적 특성변인은 유의하지 않았다. 이에 따라 유아가 가정에서 충분한 야간수면을 취할 수 있도록 부모는 적절한 생활환경을 제공해 주어야하며 자녀의 양육을 지원하기 위해 가정과 기관의 연계 강화, 부모의 근무시간 유연제 등의 제도 확산과 시행의 필요성이 제기된다.

왕복회전식 니켈-티타늄 파일을 이용한 근관 형성 시 발생하는 회전력 및 수직력에 대한 평가

유연지(Yeon Jee Yoo),임범순(Bum-Soon Lim),김진우(Jin Woo Kim),백승호(Seung Ho Baek),이인복(In Bog Lee) 대한치과재료학회 2014 대한치과재료학회지 Vol.41 No.1

사물인터넷환경에서 효과적인 서비스 제공을 위한 구성요소 모듈화 디자인 방법

유연지(Yeon ji Ryu),이병욱(Byeong-uk Lee),임선영(Sun-young Im),노병희(Byeong-hee Roh) 한국정보과학회 2015 한국정보과학회 학술발표논문집 Vol.2015 No.6

Investigation of the Diagnostic Value of Ultrasonography for Radial Neuropathy Located at the Spiral Groove

송서진,유연지,원선재,박혜정,이원일 대한재활의학회 2018 Annals of Rehabilitation Medicine Vol.42 No.4

Objective To determine a diagnostic cut-off value for the cross-sectional area (CSA) of the radial nerve using ultrasonography for radial neuropathy located at the spiral groove (SG).Methods Seventeen patients with electrodiagnostic evidence of radial neuropathy at the SG and 30 healthy controls underwent ultrasonography of the radial nerve at the SG . The CSAs at the SG were compared in the patient and control groups. The CSA at the SG between the symptomatic and asymptomatic sides (ΔSx–Asx and Sx/Asx, respectively) were analyzed to obtain the optimal cut-off value. The relationship between the electrophysiological severity of radial neuropathy and CSA was also evaluated.Results Among the variables examined, there were statistically significant differences in the CSA between the patient and control groups, ΔSx–Asx, and Sx/Asx at the SG. In a receiver operating characteristics analysis, the cut-off CSA was 5.75 mm 2 at the SG (sensitivity 52.9%, specificity 90%), 1.75 mm2 for ΔSx–Asx (sensitivity 58.8%, specificity 100%), and 1.22 mm2 for Sx/Asx (sensitivity 70.6%, specificity 93.3%) in diagnosing radial neuropathy at the SG. There was no significant correlation between CSA and electrophysiological severity score for either patient group.Conclusion The reference value obtained for CSA of the radial nerve at the SG may facilitate investigation of radial nerve pathologies at the SG.

Chemical Constitution, Morphological Characteristics, and Biological Properties of ProRoot Mineral Trioxide Aggregate and Ortho Mineral Trioxide Aggregate

김기연,유연지,장석우 대한치의학회 2013 Journal of korean dental science Vol.6 No.2

Purpose: This study sought to compare the elemental constitution, morphological characteristics, particle sizedistribution, biocompatibility, and mineralization potential of Ortho MTA (OMTA) and ProRoot MTA (PMTA). Materials and Methods: OMTA and PMTA were compared using energy-dispersive spectrometry, particle sizeanalysis, and scanning electron microscopy. The biocompatibility and mineralization-related gene expression(osteonectin and osteopontin) of both MTAs were also compared using methylthiazol tetrazolium assay and reversetranscription-polymerization chain reaction analysis, respectively. The results were analyzed by Kruskal-Wallis testwith Bonferroni correction. P-value of <0.05 was considered significant. Result: The morphology of OMTA powders was similar to that of PMTA. The constituent elements of both MTAswere calcium, silicon, and aluminum. The mean particle sizes of OMTA and PMTA were 4.60 and 3.34 mm,respectively. Both MTAs had equally favorable in vitro biocompatibility and affected the messenger RNA expressionof osteonectin and osteopontin. Conclusion: Within the limitations of this study, OMTA could be a promising biomaterial in clinical endodontics.