Light-emitting diode assessment of dentinal defects: the role of presumed extraction forces

Coelho, Marcelo Santos,Card, Steven J.,Tawil, Peter Z. The Korean Academy of Conservative Dentistry 2017 Restorative Dentistry & Endodontics Vol.42 No.3

Objectives: The evaluation of iatrogenic dentinal defects in extracted teeth may be influenced by extraction forces and prolonged dry times. The purpose of this study was to compare the presence of dentinal defects in freshly extracted, periodontally compromised teeth with those in a group of teeth with uncontrolled extraction forces and storage time. Materials and Methods: The experimental group consisted of eighteen roots obtained from teeth extracted due to periodontal reasons with class II or III mobility. They were kept in saline and sectioned within 1 hour following extraction. The control group consisted of matched root types obtained from an anonymous tooth collection, consistent with previous dentinal defect studies. The slices were obtained at 3, 6, and 9 mm from the apex. The imaging process exposed all specimens to no more than 60 seconds of dry time. The ${\times}12.8$ magnification was used for the 9 mm slices and ${\times}19.2$ magnification for the 3 mm and 6 mm slices under light-emitting diode (LED) transillumination. The root canal spaces and periodontal tissues were masked to minimize extraneous factors that might influence the evaluators. Chi-square test was used for statistical analysis. Results: Dentinal defects were detected in 17% of the experimental group teeth, compared to 61% of control teeth (p = 0.015). Conclusions: LED transillumination assessment of freshly extracted roots with class II or III mobility showed smaller number of dentinal defects than roots with uncontrolled storage time and extraction forces. The use of freshly extracted roots with mobility should be considered for future dental defect assessment studies.

Light-emitting diode assessment of dentinal defects: the role of presumed extraction forces

Marcelo Santos Coelho,Steven J. Card,Peter Z. Tawil 대한치과보존학회 2017 Restorative Dentistry & Endodontics Vol.42 No.3

Objectives: The evaluation of iatrogenic dentinal defects in extracted teeth may be influenced by extraction forces and prolonged dry times. The purpose of this study was to compare the presence of dentinal defects in freshly extracted, periodontally compromised teeth with those in a group of teeth with uncontrolled extraction forces and storage time. Materials and Methods: The experimental group consisted of eighteen roots obtained from teeth extracted due to periodontal reasons with class II or III mobility. They were kept in saline and sectioned within 1 hour following extraction. The control group consisted of matched root types obtained from an anonymous tooth collection, consistent with previous dentinal defect studies. The slices were obtained at 3, 6, and 9 mm from the apex. The imaging process exposed all specimens to no more than 60 seconds of dry time. The × 12.8 magnification was used for the 9 mm slices and × 19.2 magnification for the 3 mm and 6 mm slices under light-emitting diode (LED) transillumination. The root canal spaces and periodontal tissues were masked to minimize extraneous factors that might influence the evaluators. Chi-square test was used for statistical analysis. Results: Dentinal defects were detected in 17% of the experimental group teeth, compared to 61% of control teeth (p = 0.015). Conclusions: LED transillumination assessment of freshly extracted roots with class II or III mobility showed smaller number of dentinal defects than roots with uncontrolled storage time and extraction forces. The use of freshly extracted roots with mobility should be considered for future dental defect assessment studies.

비내시경으로 치료한 거대 전두-상안와봉소 점액낭종 1예

김기택,박장혁,김태환,박동준 대한이비인후과학회 2004 대한이비인후과학회지 두경부외과학 Vol.47 No.4

Mucoceles of the paranasal sinuses are chronic expanding lesions containing inspissated mucus, which occurs when sinus ostium is obstructed. A variety of conservative and radical surgical procedures have been introduced, with each approach having advantages as well as disadvantages. Diseased frontal sinus mucosa and bone were commonly ablated by radical frontal sinus surgery such as osteoplastic flap surgery in the past. During the last decade, endoscopic sinus surgery has become the major choice for the treatment of paranasal sinus mucoceles, and the technique of endoscopic sinus marsupialization has been considered non-invasive and successful. But the technique has limitation in cases with small frontal recess or mucocele in the lateral portion of the frontal sinus which is not accessible via the nose, and hypertrophic mucosa obstructing the entire sinus. A 52-year-old man was presented with a supraorbital cell mucocele located in the lateral side of frontal sinus mucocele, which could not be treated by endoscopic surgery alone. Endoscopic surgery with sinus marsupialization, trephination and transillumination technique was introduced. We report this case with a review of related literatures.

광봉 각도에 따른 초회 삽관 성공률의 비교

김민균 대한마취통증의학회 2007 Anesthesia and pain medicine Vol.2 No.4

Background: It has been recommended that lightwand tracheal intubation be used for cases in which there is difficult airway management. Transillumination of the soft tissue of the neck by the lightwand can lead to successful intubation; however, this depends on skin color, obesity, head position, angle and the bent length of the lightwand. The goal of this study was to compare the success rates of intubation on the first attempt and complications of lightwand orotracheal intubation that occurred when using the lightwand at angles of 60o and 90o. Methods: One hundred forty eight patients of ASA physical status 1 or 2 were enrolled in this study. Patients in whom intubation had previously been difficult as well as patients who had the potential for difficult intubation were excluded from this study. Patients were randomly assigned to one of two groups: The lightwand bent in 60o (LW60) group and the lightwand bent in 90¡o (LW90) group. Anesthesia was performed using propofol (2 mg/kg), fentanyl (1μg/kg) and rocuronium (0.9 mg/kg), and lightwand orotracheal intubation was attempted 2 minutes after the induction of anesthesia. The success rates of intubation, the number of attempts and their duration, as well as hemodynamic changes, resistance to the tube and complications that occurred during the procedure were recorded. Results: In the LW90 group, resistance to the tube during lightwand intubation occurred in a significant number of patients (P < 0.05), however, there were no significant differences observed between the two groups with regard to the intubation success rates on the first attempt, the duration of intubation, hemodynamic changes and complications. Conclusions: Their were no significant differences observed between intubation success rates on first attempt and complications when using a lightwand bent to 60¡o or 90o in patients without any previously known airway abnormalities.

Comparison between Glidescope and Lightwand for tracheal intubation in patients with a simulated difficult airway

양기환,정찬호,송경철,송정윤,송장호,변효진 대한마취통증의학회 2015 Korean Journal of Anesthesiology Vol.68 No.1

Background: Although Lightwand and Glidescope have both shown high success rates for intubation, there has been noconfirmation as to which device is most effective for difficult endotracheal intubation. We compared the Glidescope andLightwand devices in terms of duration of intubation and success rate at the first attempt in a simulated difficult airwaysituation. Methods: Fifty-eight patients were randomized to undergo tracheal intubation with either the Glidescope (Glidescopegroup, n = 29) or the Lightwand (Lightwand group, n = 29). All patients were fitted with a semi-hard cervical collar inorder to simulate a difficult airway, and intubation was attempted with the assigned airway device. The data collected includedthe rate of successful endotracheal intubation, the number of attempts required, the duration of the intubation, aswell as the interincisor distance, hemodynamic variables, and adverse effects. Results: There was no difference between Glidescope group (92.6%) and Lightwand group (96.4%) in terms of successrate for the first attempt at intubation. The duration of successful intubation for the first tracheal intubation attempt wassignificantly longer in Glidescope group than in Lightwand group (46.9 sec vs 29.5 sec, P = 0.001). All intubations werecompleted successfully within two intubation attempts. The incidence of hypertension was significantly higher in Glidescopegroup than in Lightwand group (51.9% vs 17.9%, P = 0.008). Conclusions: In a simulated difficult airway situation, endotracheal intubation using Lightwand yielded a shorter durationof intubation and lower incidence of hypertension than when using Glidescope.

Endotracheal intubation using i-gel® and lightwand in a patient with difficult airway -a case report-

최춘길,양기환,정종권,한정욱,이춘수,차영덕,송장호 대한마취통증의학회 2015 Korean Journal of Anesthesiology Vol.68 No.5

This case report involves tracheal intubation using i-gel® in combination with a lightwand in a patient with a difficult airway, classified as Cormack-Lehane grade 3. I-gel® was used during anesthesia induction to properly maintain ventilation. The authors have previously reported successful tracheal intubation on a patient with a difficult airway through the use of i-gel® and a fiberoptic bronchoscope. However, if the use of a fiberoptic bronchoscope is not immediately available in a patient with a difficult airway, tracheal intubation may be performed by using i-gel® and a lightwand in a patient with difficult airway, allowing the safe induction of anesthesia.

국소마취하 광투시 전동형 정맥제거술 (Transilluminated Powered Phlebectomy: TIPP)을 이용한 하지 정맥류 수술

이종훈,최강국,문헌종,채윤석,이종인,정진호,박기일,이우경,채영근,최영순,김용호,박동호 대한혈관외과학회 2004 Vascular Specialist International Vol.20 No.1

하지 정맥류의 외과적 치료로서 광투시 전동형 정맥제거술의 장점

서우형,류동도,조민영,정석인,최상용,서성옥,김영철,구범환,황정웅 대한혈관외과학회 2003 Vascular Specialist International Vol.19 No.1

하지 정맥류에 대한 광투시 전동형 정맥 제거술의 초기 보고

한상윤(Sang Yoon Han),조지웅(Ji Woong Cho),김병천(Byung Chun Kim),손태경(Tae Kyung Sohn),정봉화(Bong Wha Chung),정경석(Kyung Suk Chung),정찬민(Chan Min Chung) 대한외과학회 2004 Annals of Surgical Treatment and Research(ASRT) Vol.67 No.6

과학 수업에서 스마트폰 활용을 위한 Zooming Tools 개발 연구

박기석,전상학,이안드레 한국현장과학교육학회 2014 현장과학교육 Vol.8 No.2

As internet and mobile technologies have been developed, therehave been the endeavors to grasp them to education. Withappearance of e-learning, various educational utilizationsincluding m-learning have been shown and, recently, the studieson smart learning to apply smartphones in education are beingconducted. Smartphones are a kind of new-paradigm mobiledevices which may substitute the functions of conventional PC,PMP, MP3, and digital cameras, etc. using applications in freemobile internet environment in addition to the functions oftelephones.Nowadays the world tries to construct smartclassrooms, but suffering from the high costs. In addition,high-priced imaging equipments such as microscopic camerasand visual presenters are also needed for smart-learning. Tosolve such problem, we developed smartphone adapters tosubstitute for high-priced imaging equipment and a system toapplicate the various functions of smartphone as well. 인터넷 및 모바일 기기의 눈부신 발달은 사회 전반에 큰 영향을 미치고 있다. 교육현장에서도 예외가 아니다. e-learning 및 smart-learning으로 대두되는 인터넷과 모바일 기기를 활용한 교수학습 모형이 다양한 수업에서 소개되고 있다. 하지만 과학수업에서 인터넷과 모바일 기기를 적극적으로 활용하는 것이 쉽지 않은 상황이다. 본 연구는 모바일 기기의 대표격인 스마트폰을 과학교육에 적용하려는 목적에서 시작되었다. 스마트폰은 전화기능뿐만아니라 기존의 PC, PMP, MP3, 디지털카메라 등의 기능을 대체할 수 있는 새로운 패러다임의 모바일 기기이다. 본 연구에서는 스마트폰을 활용하여적은 비용으로 고가의 이미징 장비를 대신할 수 있는 Zooming Tools이라는 스마트폰 어댑터를 개발하였고, Zooming Tools의 적용 가능성을 확인하였다.