• 대한치과의사협회지
• /
• 제56권7호
• /
• pp.391-397
• /
• 2018

Mess removal, electrocoagulation, cryosurgery are conventional methods in the treatment of various oral mucosal diseases. However, there are several problems or complication during or after surgery using conventional tools. Recently, LASER gradually become useful tool in the surgery of oral mucosal diseases. Of the LASER, carbon dioxide-mediated LASER is widely used one. Carbon dioxide LASER has many advantages such as good bleeding control, decreased damage to adjacent tissue, decreased pain and swelling, reduced scar formation, even bacteriocidal effects. In this reports, the author describe pros and cons of LASER, especially focused on carbon dioxide, and shed light on the field of LASER application in treatment of various oral mucosal diseases.

• Medical Lasers
• /
• 제10권3호
• /
• pp.181-184
• /
• 2021

Scars can cause great psychological stress among patients. Currently, there are numerous topical agents, laser and surgical treatments available for skin rejuvenation and scar minimization. Laser-assisted drug delivery (LADD) is a treatment method that increases drug delivery by stimulating the skin physically and chemically to enhance the penetration of topical agents. This is one of the areas of great interest in the treatment of various skin diseases in addition to its use for cosmetic purposes. In particular, LADD is relatively non-invasive and has advantages in terms of accessibility and stability. Poly-L-lactic acid (PLLA) is a collagen stimulator known to gradually restore skin volume by inducing inflammation and fibroplasia. Herein, we report a case of treatment of an atrophic scar with fractional carbon dioxide laser-assisted PLLA delivery.

• 대한약침학회지
• /
• 제22권3호
• /
• pp.200-203
• /
• 2019

Syringoma is a benign eccrine sweat gland tumor that predominantly appears in females during puberty with multiple smooth papules measuring 1-2 mm in diameter. Common locations are on lower eyelids and cheeks. Vulvar syringoma is quite a rare, occurring condition with only a few cases reported. Here, we are reporting a case of 31-year-old female with vulvar syringoma associated with pruritus. The lesion was treated with carbon dioxide (CO2) laser ablation and 50% trichloroacetic acid (TCA) chemical peeling. Jaungo was used for wound care after laser abrasion. The combination treatment was effective for removing syringoma lesions. Post laser management with fusidic acid cream and jaungo cream was sufficient to prevent infection and promote wound healing.

• Medical Lasers
• /
• 제10권2호
• /
• pp.111-114
• /
• 2021

A 38-year-old man visited the hospital for a voice change that began two months previously. There were no other accompanying symptoms; the patient had a history of 20 years of smoking. Carbon dioxide (CO₂) laser cordectomy was performed on the left side of the vocal cord, and the biopsy results showed squamous cell carcinoma. Radiation therapy was not performed, and CO₂ laser cordectomy was performed again because of a recurrence of left vocal cord mass three years after a progress observation.

• 대한기관식도과학회:학술대회논문집
• /
• 대한기관식도과학회 1983년도 제17차 학술대회연제순서 및 초록
• /
• pp.7.2-8
• /
• 1983

만성 후두및 기관협착증의 빈도는 점차 증가하고 있는 추세에 있으며 이에 대한 치료로서 후두 및 기관확장술이나 성형술을 비롯하여 단단문합술등, 여러종류의 방법들이 각각의 적응증에 따라 시행되어 왔지만 아직도 만족스러운 결과를 얻기 어려운 경우가 적지 않다. 1972년 Strong과 Jako가 후두질환에 $CO_2$ Laser 사용을 시도한 것을 비롯하여 이비인후과영역에서 $CO_2$ Laser는 새로운 수술방법으로 각광을 받게 되었고 그 뒤를 이어 Mihashi(1976), Lyons(1980)등에 의하여 성공적으로 후두협착증의 치료에 이용된 바가 있다. 저자들은 1982년 4월부터 1983년 3월까지 1년간 후두기관성형술 및 확장술로는 성공적으로 기도를 유지하기 어려웠던 4례와 후두암으로 반측후두절제술 및 성문성형술 (neoglottis)을 받은 후 기도협착을 초래하였던 1례에서 수술현미경하에 $CO_2$ Laser를 사용함으로써 만족할 만한 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다. 1) 후두 및 기관협착의 치료에 Laser를 이용한 술식은 기도유지에 있어 매우 효과적인 새로운 방법이다. 2) Laser수술 후 육아조직형성은 다른 방법에 비하여 비교적 적었다.

• 한국안전학회지
• /
• 제25권6호
• /
• pp.9-13
• /
• 2010

An experimental study for characteristics of soot were conducted at the post-flame region in jet diffusion flames, where carbon dioxide was used as additives in oxidizer stream. Light-extinction method was performed using He-Ne laser with wave length at 632.8nm for the measurement of relative soot density and soot volume fraction with dimensionless extinction coefficient, $K_e$ and mass specific extinction coefficient, ${\sigma}_s$. To increase of resolution, laser light was modified for sheet-form using concave, convex lenses and slit. C/H ratio was introduced for quantitative analysis of soot growth which is expressed by carbonization and dehydrogen. Also transmission electron microscopy(TEM) was used for observation of morphological shape. The results show that the relative soot density in the post-flame region was lower when carbon dioxide was added in oxidizer stream because of reduction of flame temperature.

• 구강회복응용과학지
• /
• 제23권1호
• /
• pp.43-53
• /
• 2007

The purpose of this experimental study was to examine the effect of the decontamination of carbon dioxide ($CO_2$) laser in treatment of ligature-induced peri-implantitis in dogs. A total 24 implants with a sandblasted with large-grit and acid-etched (SLA) surface were inserted in six mongrel dogs. After a 3-month healing period, experimental peri-implantitis characterized by a bone loss of about 3mm was established by inducing with wires. And then wires were removed and plaque control was implemented. Surgical treatment involving flap procedure + debridement of implants surface with chlorhexidine and saline (group 1), flap procedure + GBR with absorbable collagen membrane (Bio-Gide) and mineralized bone graft (Bio-Oss) (group 2), and flap procedure + $CO_2$ laser application + GBR (group 3) was performed. The animals were killed 8 weeks and 16 weeks after treatment, respectively. A histomorphometric analysis confirmed statistically considerable new bone formation within the limit of the 5 most coronal threads in group 3 compared with group 1 at 16 weeks (P<0.05). And intragroup analysis showed considerable increase of new bone formation in group 3 at 16 weeks compared with 8 weeks (P<0.05). The present study demonstrates considerable new bone formation after treatment of experimental peri-implantitis with flap procedure, $CO_2$ laser application and GBR.

• 한국광학회지
• /
• 제35권2호
• /
• pp.71-80
• /
• 2024

이산화탄소 원격 계측을 위한 라만 라이다 장치를 개발하기 위해 라만 라이다 장치의 소형화를 진행하고, 이에 스캐닝 장치를 결합하여 라만 라이다 시스템을 개발하였다. 개발한 시스템의 성능 검증을 위하여 가스 챔버를 약 87 m 거리에 위치시킨 후, 이산화탄소의 농도 변화에 따른 라만 산란 신호를 계측하였다. 그 결과 개발된 라만 라이다 장치를 이용하였을 때 약 0.67-40 vol% 사이의 농도에서 높은 선형성을 나타냄을 확인하였다.

• Carbon letters
• /
• 제10권1호
• /
• pp.38-42
• /
• 2009

This study aims to find a correlation between XRD and Raman result of the oxidized high modulus carbon fibers as a function of its oxidation degrees, and compare with the isotropic carbon fiber reported early. La of the high modulus carbon fiber prepared by oxidation in carbon dioxide gas have been observed using laser Raman spectroscopy. The basic structural parameters of the fibers were evaluated by XRD as well. The La of the original high modulus carbon fibers were measured to be 144 ${\AA}$ from Raman analysis and 135 ${\AA}$ from XRD analysis. La of the 92% oxidized fiber were 168 ${\AA}$ by using Raman and 182 ${\AA}$ by using XRD. There was some correlation between the La value obtained from Raman and XRD. However the La value changes of the high modulus carbon fiber through whole oxidation process showed opposite tendency compare with the isotropic carbon fiber because of the fiber structure basically.

• Journal of Welding and Joining
• /
• 제11권1호
• /
• pp.73-79
• /
• 1993

The phenomenon of metal transfer has been investigated for different transfer modes using a digital high speed motion analyzer and an arc shadow-graphing system based on a laser source and related optical system. It was observed that the pinch instability phenomenon did not occur for the globular transfer mode, since the liquid globule was then spherical rateher than a cylindrical liquid bar. On increasing the ratio of carbon dioxide to argon, the transition current from globular to spray transfer generally increased, but it is interesting that the transition was observed to occur at the lowest current in a 5% CO$_{2}$-95% argon gas mixture. For pure carbon dioxide and helium shielding gases, the drop frequency increased slowly with increasing current. At high currents or an argon based shielding gas, the length of liquid bar decreased as the carbon dioxide content increased. The acceleration of a droplet within the arc was determined using the gas drag force theory and was found to be greater than the experimental results.