근단부 성형 크기에 따른 다양한 전동 니켈티타늄 파일의 중심 변위율 및 만곡도 감소 비교

곽상원(Sang-Won Kwak),박정길(Jeong-Kil Park),허복(Bock Hur),김현철(Hyeon-Cheol Kim) 대한치과의사협회 2010 대한치과의사협회지 Vol.48 No.7

The purpose of this study was to compare the centering ratio and reduction of canal curvature according to the preparation sizes of #30, #40 and #50 using three rotary NiTi instruments which have different shaft tapers. Seventy-two simulated root canals in clear resin blocks (Endo Training Bloc; Dentsply Maillefer, Ballaigues, Switzerland) were divided as following 3 groups according to the file system; the 24 canal blocks prepared with each of ProTaper Universal system (Group P), LightSpeed eXtra system (Group L), and K3 (Group K). The pre- and post-instrumented root canals were scanned and superimposed to evaluate and calculate the centering ratio and reduction of canal curvature. Mean scores of each group were statistically analyzed using one-way ANOVA and Duncan’s multiple range test for post-hoc comparison. The results were as followings: 1. Group L showed better centering ratio, followed by K and P. And all experimental groups generally showed increasing tendency of centering ratio as the apical size was increasing from #30 to #50, except at 1㎜ level of group P where showed reducing tendency of centering ratio. The smaller the ratio, the better the instrument remained centered in the canal. 2. Group P showed more decrease of canal curvature at all apical shaping size (p<0.05) Under the conditions of this study, the shaft design could affect the quality of canal shaping and the smooth taperless flexible (LightSpeed) shaft design was capable of preparing canals with good morphological characteristics in curved canals.

근단부 성형 크기에 따른 다양한 전동 니켈티타늄 파일의 중심 변위율 및 만곡도 감소 비교

곽상원(Sang-Won Kwak),박정길(Jeong-Kil Park),허복(Bock Hur),김현철(Hyeon-Cheol Kim) 대한치과의사협회 2009 대한치과의사협회지 Vol.47 No.7

The purpose of this study was to compare the centering ratio and reduction of canal curvature according to the preparation sizes of #30,#40 and #50 using three rotary NiTi instruments which have different shaft tapers. Seventy-two simulated toot canals in cleat resin blocks (Endo Training Bloc, Dentsply Maillefer, Ballaigues, Switzerland) were divided as following 3 groups according to the file system; the 24 canal blocks prepared with each of ProTaper Universal system (Group P), LightSpeed eXtra system (Group L), and K3 (Group K), The pre- and post-instrumented root canals were scanned and superimposed to evaluate mid calculate the centering ratio and reduction of canal curvature. Mean scores of each group were statistically analyzed using one-way ANOVA and Duncan’s multiple range test for post-hoc comparison. The results were as followings: 1. Group L showed better centering ratio, followed by K and P. And all experimental groups generally showed increasing tendency of centering ratio as the apical size was increasing from #30 to #50,except at 1 mm level of group P where showed reducing tendency of centering ratio. The smaller the ratio, the better the instrument remained centered in the canal. 2. Group P showed more decrease of canal curvature at all apical shaping size (p < 0.05) Under the conditions of this study, the shaft design could affect the quality of canal shaping and the smooth taperless flexible (LightSpeed) shaft design was capable of preparing canals with good morphological characteristics in curved canals.

증례보고 : 척추마취 후 발생한 두개강내 경막하 출혈

곽상원 ( Sang Won Kwak ),서민교 ( Min Kyo Suh ),김성수 ( Seong Su Kim ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.1

Intracranial subdural hematoma is an exceptionally rare complication of spinal anesthesia. An 88-year-old female patient diagnosed with grade V uterine prolapse with rectocystocele received a vaginal hysterectomy and anteroposterior repair under spinal anesthesia. At 4 days postoperatively, she appeared to have decreased orientation, inappropriate behavior, and right side weakness grade Ⅲ. Brain MR diffusion and CT revealed a bilateral subdural hematoma. She was improved after burr hole drainage. We report a case of intracranial subdural hematoma developing after spinal anesthesia, a rare complication. (Korean J Anesthesiol 2009;56:92~5)

수종의 수산화칼슘 근관 첩약제와 레진계 근관 실러의 사용 후 통증 발생 빈도에 관한 연구

곽상원(Sang Won Kwak),김현철(Hyeon-Cheol Kim) 대한치과의사협회 2018 대한치과의사협회지 Vol.56 No.5

Objectives: This study aimed to compare the postoperative pain and clinical performance after applying three different intracanal medicaments and root canal sealers. Materials and Methods: Sixty-five patients requiring root canal treatment due to symptomatic apical periodontitis were included in this study. After a glide path preparation by using PathFile, each canal was shaped with ProTaper Next file system. After the canal cleaning and shaping procedure, the canal was dried and each intracanal medicaments were adjusted (Calcipex II, TRC-paste, Metapaste). At the next visit, the patients were requested to answer the absence of the pain after the procedure. Once the patients showed no symptom, the canal was obturated with each corresponded root canal sealers (AH plus, Radic-sealer, ADseal). The patients were recalled after 1 week, 1, 3, and 6 months to check the postoperative pain or unexpected clinical signs. One-way ANOVA and Duncan’s post hoc comparison, and Chi-square test were used for statistical analysis to evaluate any differences among tested materials. Results: The average number of visits for intracanal medication was 2.69, 2.65, and 2.61 for Calcipex II, TRC-paste, and Metapaste. There were no statistically differences in post-obturation pain among three groups obturated with different root canal sealers (P > 0.05). Conclusions: Under the limitations of this study, three tested intracanal medicaments and epoxy resin root canal sealers showed clinically acceptable similar results.

미성숙 영구치의 치수재혈관화

곽상원(Sang Won Kwak) 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.8

Treatment of immature permanent teeth with irreversibly damaged pulp has been challenging in dental practice because of the lack of apical constriction, thin dentinal walls, and short roots. This may lead to the extrusion of filling materials, and fracture of the root due to its more fragile feature during shaping of the root canal. Apexification with calcium hydroxide or MTA is one of the treatment options for these cases. Although favorable results of apexification have been reported, these treatment procedures do not guarantee the increase of root length and/or width even after a long term period. Thus, treated teeth are still prone to fractures. Recently, pulp revascularization has been proposed as an alternative treatment for immature teeth with necrotic pulp and periapical pathosis. Pulp revascularization allows the stimulation of the apical development and the root maturation. There have been many treatment protocols using various materials such as antibiotics and calcium hydroxide medicament. In this case report, literature review about pulp revascularization and two related cases are presented.

중등학교 과학 교사의 밀도에 관한 내용교수지식 수준과 그에 따른 내용 표상의 구성 요소별 특징

곽상원,최병순,Kwak, Sang-Won,Choi, Byung-Soon 대한화학회 2012 대한화학회지 Vol.56 No.1

The purposes of this study were to evaluate the level of PCK which middle school science teachers have on the concept of density and to analyze the characteristics of science teachers' content representation on the concept of density by their PCK level. For that purpose, 20 science teachers were selected and asked to answer the questionnaire on the eight aspects of CoRe. Results of this study indicated that the science teachers' PCK levels were low in general and evaluated as below average. The differences among the characteristics of science teachers' content representation by their PCK level were high in seven aspects of CoRe but the one aspect of the understanding of learner's preconception. These differences were analyzed and the patterns shown by the science teachers in eight aspects of CoRe were drawn in this study. It was also found that the characteristics drawn in eight aspects of content representation shown by the teachers whose PCK level was medium were close to those whose PCK level was low rather than high in most aspects of CoRe. 이 연구에서는 중등학교 과학 교사 20명을 대상으로 밀도에 대한 내용 표상을 조사하여 각 교사의 밀도 수업과 관련된 내용교수지식 수준을 판단하고, 그에 따라 내용 표상의 구성 요소별로 어떤 특징이 있는지를 분석하였다. 연구결과, 과학 교사들의 내용교수지식 수준은 전반적으로 보통 수준으로 판명되었다. 교사들의 내용교수지식 수준에 따라 나타나는 내용 표상의 구성 요소별 특징은 '학습자의 선개념에 대한 이해'를 제외한 7개의 구성 요소에서 차이가 크게 나타남을 알 수 있었으며, 이 연구에서는 그 차이를 구성 요소별로 분석하고, 그 특징을 추출하였다. 또한, 내용교수지식 수준이 중간인 교사들에게서 나타난 내용 표상의 구성 요소별 특징은 내용교수지식 수준이 높은 교사들 보다는 낮은 교사들과 대부분의 구성 요소에서 비슷한 것으로 밝혀졌다.

치근단 농양에서 유래한 피부 누공의 고찰

서성원 ( Sung Won Suh ),김수한 ( Su Han Kim ),정도상 ( Do Sang Jung ),고현창 ( Hyun Chang Ko ),김문범 ( Moon Bum Kim ),곽상원 ( Sang Won Kwak ),허복 ( Bock Hur ),권경술 ( Kyung Sool Kwon ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.8

Background: An odontogenic sinus tract draining to the skin is the most common type of cutaneous fistula that occurs on the face. This lesion can be a diagnostic challenge to clinicians who are not familiar with cutaneous fistula since many patients with an odontogenic sinus tract draining to the skin do not have any symptom such as toothache. Objective: Our purpose was to determine the characteristic features of an odontogenic sinus tract draining to the skin. Methods: Eleven patients who presented with an odontogenic sinus tract draining to the skin at the Dermatologic Department of Pusan National University Hospital during the last ten years were enrolled in this study. We reviewed all the medical records of the patients. Results: The mean age was 51.8 years. The male to female ratio was 1.2:1. Nine patients (82%) had lesions on their chins or the mandibular region. The most common tooth with endodontic infection was the lower first premolar tooth (36%), and the most common clinical feature was pyogenic granuloma-like solitary papule (64%). The panoramic view showed radiolucent periapical abscesses in all the patients. Skin biopsy showed chronic granulomatous inflammation, and fistular tracts were present in three patients. Only 1 of 11 patients (9%) had toothache, and two patients had prior therapies for prosthetic dentures or caries, respectively. Nine patients (82%) were treated ineffectively, and their first visit was to adermatologic clinic (91%) or an otolaryngologic clinic (9%). After the diagnosis of odontogenic sinus tract draining to the skin, eight patients (73%) were treated completely by root canal therapy or extraction of teeth. Conclusion: In this study, most patients had no toothache or history of dental disease, and they were treated inappropriately, even in dermatologic clinics. The results of this study will help reduce the incidence of inappropriate management for odontogenic sinus tract draining to the skin at dermatologic departments. (Korean J Dermatol 2009;47(8):904~910)

Glide path 형성용 니켈티타늄 회전 파일의 효율

김현철(Hyeon-Cheol Kim),곽상원(Sang Won Kwak),하정홍(Jung-Hong Ha) 대한치과의사협회 2017 대한치과의사협회지 Vol.55 No.10

Objectives: This preliminary study compared the effects of glide path establishing instruments prior to substantial root canal preparation. Materials and Methods: Glide path was established by enlargement of the 2nd mesiobuccal root canal of Dentalike by using three kinds of glide path preparation nickel-titanium file; PathFile, One G and ProGlider. The pre- and post-instrumented Dentalikes were weighed in the resolution of 1/10㎎. In addition, after glide path preparation, torque generated during shaping using the WavoOne file was measured. The data were analyzed by one-way ANOVA and Tukey post-hoc test at a significance level of 95%. Results: The ProGlider had the significantly larger amount of reduced weight than other instrument groups (p<0.05). There was no significant difference between group of glide path preparation with ProGlider and without glide path preparation in maximum torque and total stress generation during the shaping with WaveOne. Conclusions: Glide path preparation instruments may have different efficiency according to their geometries. The Dentalike artificial teeth were revealed to have discrepancies in the size of root canals by microCT examination. It is impossible to make a meaningful judgment of the results due to the reliability or resolution problem of the root canal size of the artificial tooth selected as the standardized tooth.

제왕절개술에서 경식도 초음파를 이용한 폐혈전색전증의 수술 중 진단

오충식 ( Choong Sik Oh ),곽상원 ( Sang Won Kwak ),김태엽 ( Tae Yop Kim ),우남식 ( Nam Sik Woo ),손인숙 ( In Sook Sohn ),지현근 ( Hyun Keun Chee ) 대한마취과학회 2008 Korean Journal of Anesthesiology Vol.54 No.1

데이비드 크로넨버그의 영화에 수용된 테크놀로지와 신체의 관계

김경식(Kyung-Sik Kim),곽상원(Sang-Won Kwak) 한국엔터테인먼트산업학회 2017 한국엔터테인먼트산업학회논문지 Vol.11 No.7

데이비드 크로넨버그(David Cronenberg 1943년 3월 15일~ )의 영화는 새로운 테크놀러지와 몸의 만남에 따라 변화하는 인간의 의식을 이야기한다. 그의 영화는 인간의 신체에 대한 냉소적 취향, 기계가 인간이 일부 또는 한 몸이 되고 또 탈피해 진화, 퇴화, 전염으로 표현되는 돌연변이적 모습을 지닌 인간의 모습을 보여주어 ‘다형적 도착증’에 대한 크로넨버그의 애착을 표현한다.《시버스 Shivers》에서는 망가진 장기를 대신하는 기생충,《라비드 Rabid》에서는 오토바이 사고로 망가진 얼굴을 치료 하는 성형기술, 《더 블루드 The Brood》에서는 개인의 욕망으로 사념화 되어 변화된 어머니의 몸.《비디오드롬 VIDEODROME》(1983),《엑시트턴즈 eXistenZ》(1999)는 테크놀로지로 인해‘형태를 변환 당한 인물’을 통해 무너지는 개인 내부의 세계를 다룬다. 영화의 주인공들은 인간의 본연의 육체에서 해방되어 변화당한, 전환당한 육체로 인해 해방된 무의식으로 철저하게 자신과 사회를 파괴해 간다. 즉, 크로넨버그의 영화는 기술이 지배하는 새로운 세계로 들어가 자아가 뒤바뀌거나 변화하는 과정을 묘사하면서 새로운 시대의 인간다움의 가치를 관찰하고 있다. David Cronenberg`s films contain a new image of technology. He knows that technology affects a person`s life and is very interested in it. His film contains cynical taste of human body. Human beings and machines show human nature by showing the human form of transformation, metamorphosis, and human nature. His films systematically devalue Western stereotypes after the Western Renaissance and the postdominative dichotomy of humanity`s value since the West. The three movies《Shivers(1975), Rabid(1977), The Brood(1979)》he made when he was young showed a society where the development of new medicine and the pure and dangerous curiosity of scientists, and the nature of the `changed character` led to the collapse of `changed figures`. And another three films《VIDEODROME(1983), THE FLY(1986), eXistenZ(1999)》deal with the human world"s inner world, breaking through the `transformed character` by technology. The characters of the movie are emancipated from human nature and destroy themselves and society by the unconscious mind that freed itself from the altered body of the human body. His movies are reflected in the new world of technology, portraying a new era of identity and changing the value of a new era of humanity. His films occupy a unique position in the film industry, with the enormity of the human being`s violence and serious consideration of human nature through extreme physical deformities.