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Yahya Dowlati - One of the best experts on this subject based on the ideXlab platform.
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Laser Hair Removal comparison of long pulsed nd yag long pulsed alexandrite and long pulsed diode Lasers
Dermatologic Surgery, 2004Co-Authors: Navid Bouzari, Alireza Firooz, Hossein Tabatabai, Zahra Abbasi, Yahya DowlatiAbstract:BACKGROUND: Advances in Laser technology over the past several years have led to the development of numerous Lasers for the treatment of unwanted Hair. Laser wavelength is a key factor influencing treatment efficacy and complication rates. OBJECTIVE: To compare the efficacy and safety of Laser Hair Removal using three different Laser systems. METHODS: A retrospective study of 805 consecutive Laser-assisted Hair Removal treatments, conducted on 75 patients by means of either a long-pulsed Nd:YAG, a long-pulsed alexandrite, or a long-pulsed diode Laser is reported. All patients were evaluated at least 3 months after the last treatment, and their present conditions were compared with the 1st-day photographs. RESULTS: The mean Hair reduction was 42.4%, 65.6%, and 46.9% in Nd:YAG, alexandrite, and diode Lasers, respectively. When the number of treatment sessions was taken into account, the efficacy of alexandrite and diode Lasers was not significantly different, whereas both systems were more efficacious than Nd:YAG. Neither of the Laser systems showed better results for a particular skin type. The occurrence of side effects was not significantly different between three Laser systems. CONCLUSION: Both long-pulsed alexandrite and long-pulsed diode Laser systems are effective in the treatment of unwanted Hair, and they are more efficacious than Nd:YAG Laser.
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Laser Hair Removal comparison of long pulsed nd yag long pulsed alexandrite and long pulsed diode Lasers
Dermatologic Surgery, 2004Co-Authors: Navid Bouzari, Alireza Firooz, Hossein Tabatabai, Zahra Abbasi, Yahya DowlatiAbstract:BACKGROUNDAdvances in Laser technology over the past several years have led to the development of numerous Lasers for the treatment of unwanted Hair. Laser wavelength is a key factor influencing treatment efficacy and complication rates.OBJECTIVETo compare the efficacy and safety of Laser Hair remov
Nathan Newman - One of the best experts on this subject based on the ideXlab platform.
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Laser Hair Removal long term results with a 755 nm alexandrite Laser
Dermatologic Surgery, 2001Co-Authors: Sorin Eremia, Sanusi Umar, Cindy Y Li, Nathan NewmanAbstract:BACKGROUND. Hypertrichosis is a common problem for which Laser Hair Removal is becoming the treatment of choice. Optimal wavelength, pulse duration, spot size, fluence, and skin cooling parameters for various skin types have not yet been firmly established. OBJECTIVE. To evaluate the long-term efficacy and safety of a 3-msec 755 nm alexandrite Laser equipped with a cryogen cooling device for patients with Fitzpatrick skin types I-V. METHODS. Eighty-nine untanned patients with skin types I-V underwent a total of 492 treatments of Laser Hair Removal over a 15-month period. Each patient in the study underwent a minimum of three treatment sessions spaced 4-6 weeks apart (mean treatments 5.6). Retrospective chart review and patient interviews were used to establish Hair reduction results. Treatment sites included the axillae, bikini, extremities, face, and trunk. A 3-msec pulse width, 755 nm alexandrite Laser equipped with a cryogen spray cooling device was used in this study. Spot sizes of 10-15 mm were used. A spot size of 10 mm was used for fluences greater than 40 J/cm 2 , a spot size of 12 mm was used for fluences of 35-40 J/cm 2 , and spot sizes of 12 and 15 mm were used for fluences less than 30 J/cm 2 . Fluences ranging from 20 to 50 J/cm 2 (mean fluence 36 J/cm 2 ) were used. RESULTS. The patients had a mean 74% Hair reduction. Skin type I patients had an average of 78.5% Hair reduction using a mean fluence of 40 J/cm 2 (35-50 J/cm 2 ) and a 10-12 mm spot size (12 mm in more than 95% of treatments). Skin type II patients had a mean 74.3% Hair reduction using a mean fluence of 38 J/cm 2 (30-40 J/cm 2 ) and a 12-15 mm spot size. Skin type III patients had a mean 73.4% Hair reduction using a mean fluence of 37 J/cm 2 (25-40 J/cm 2 ) and a 12-15 mm spot size. Skin type IV patients had a mean 71.0% Hair reduction using a mean fluence of 31 J/cm 2 (25-35 J/cm 2 ) and a 12-15 mm spot size. A patient with skin type V had a 60% Hair reduction using a mean fluence of 23 J/cm 2 (20-25 J/cm 2 ) and a 12-15 mm spot size. The efficiency of Hair Removal directly correlates significantly with the fluence used. Rare side effects included transient postinflammatory hyperpigmentation (n = 9; 10%), burn with blisters (n = 1; 1%), and postinflammatory hypopigmentation (n = 2; 2%). All complications resolved without permanent scarring. CONCLUSION. The 3-msec cryogen cooling-equipped alexandrite Laser can safely and effectively achieve long-term Hair Removal in patients with skin types I-V. The best results are achieved in untanned patients with skin types I-IV.
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Laser Hair Removal with alexandrite versus diode Laser using four treatment sessions 1 year results
Dermatologic Surgery, 2001Co-Authors: Sorin Eremia, Cindy Y Li, Nathan NewmanAbstract:Background. Laser Hair Removal is the treatment of choice for hypertrichosis. The two most commonly used Hair Removal Lasers are compared. Objective. To present the results of a comparative study examining the role of wavelength, fluence, spot size, pulse width, and cooling systems on long-term results after a series of four Laser Hair Removal treatments using the 755 nm alexandrite and 800–810 nm diode Lasers. Methods. The axillae of 15 untanned, type I–V patients were treated side by side four times at 4- to 6-week intervals with a 755 nm, 3-msec pulse width, cryogen spray-equipped alexandrite Laser and an 800 nm, variable pulse width, cooled sapphire window-equipped diode Laser. Each patient was pretested and treated with the maximum fluence tolerated at the largest spot size available for each Laser (12 mm round/113 mm2 for the alexandrite and 9 mm for the diode). Results. Evaluations were done at 3, 6, 9, and 12 months after the last treatment. Twelve-month results with the alexandrite and diode Lasers achieved 85% versus 84% Hair reduction. The fact that tan avoidance was strictly followed permitted the use of relatively high fluences (25–30+ J/cm2) even in type IV patients. For most patients, four treatment sessions using high fluences (30–40 J/cm2) with relatively large spot sizes (12 mm round for the 755 nm alexandrite and 9 mm for the 800 nm diode) resulted in 12-month Hair reductions in the 90% range. Conclusion. Both the alexandrite and diode Lasers in this 12-month study produced excellent long-term Hair reductions.
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topical anesthesia for Laser Hair Removal comparison of spot sizes and 755 nm versus 800 nm wavelengths
Dermatologic Surgery, 2000Co-Authors: Sorin Eremia, Nathan NewmanAbstract:Background. The Candela alexandrite and the Coherent diode Laser systems come equipped with built-in skin cooling systems that are designed to both protect the epidermis, allowing higher fluences, and to alleviate discomfort. Nevertheless, pain can be a significant problem especially with treatment of larger areas. Scatter of the Laser beam is reportedly affected by the spot size. It is claimed that larger spot sizes are more effective at identical fluences. Objective. This study evaluated the effectiveness of a topical 5% lidocaine cream (ELA-Max) to control pain and compared pain levels at identical fluences between the 8 mm and 12 mm spot size of the alexandrite Laser and between the alexandrite and diode Laser with its 9 mm spot size. Methods. The study was conducted in the axillae of 12 patients. Each axilla was divided in half for side-by-side comparison. Half of the right axilla was treated with the alexandrite 8 mm and the other half with the 12 mm spot size at identical fluences. The left axilla was treated at the maximum tolerated fluences with the alexandrite 12 mm spot size and the diode 9 mm spot size. Results. At identical fluences and other parameters, there was significantly more pain with the alexandrite 12 mm spot size than with the alexandrite 8 mm spot size, both with or without topical anesthesia. The alexandrite Laser was significantly less painful than the diode Laser both with and without topical anesthetic. The difference was most noticeable between the alexandrite 8 mm spot size and the diode 9 mm spot size. Topical 5% lidocaine anesthesia was effective in reducing pain, though not completely, for both the alexandrite and the diode Lasers. Conclusion. Topical 5% lidocaine cream is a simple and effective method for reducing patient discomfort during Laser Hair Removal procedures, even when a skin cooling device is being used. A larger spot size causes more pain than a smaller spot size at identical fluences. The 800 nm diode Laser causes greater discomfort than the 755 nm alexandrite Laser.
Navid Bouzari - One of the best experts on this subject based on the ideXlab platform.
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Laser Hair Removal comparison of long pulsed nd yag long pulsed alexandrite and long pulsed diode Lasers
Dermatologic Surgery, 2004Co-Authors: Navid Bouzari, Alireza Firooz, Hossein Tabatabai, Zahra Abbasi, Yahya DowlatiAbstract:BACKGROUND: Advances in Laser technology over the past several years have led to the development of numerous Lasers for the treatment of unwanted Hair. Laser wavelength is a key factor influencing treatment efficacy and complication rates. OBJECTIVE: To compare the efficacy and safety of Laser Hair Removal using three different Laser systems. METHODS: A retrospective study of 805 consecutive Laser-assisted Hair Removal treatments, conducted on 75 patients by means of either a long-pulsed Nd:YAG, a long-pulsed alexandrite, or a long-pulsed diode Laser is reported. All patients were evaluated at least 3 months after the last treatment, and their present conditions were compared with the 1st-day photographs. RESULTS: The mean Hair reduction was 42.4%, 65.6%, and 46.9% in Nd:YAG, alexandrite, and diode Lasers, respectively. When the number of treatment sessions was taken into account, the efficacy of alexandrite and diode Lasers was not significantly different, whereas both systems were more efficacious than Nd:YAG. Neither of the Laser systems showed better results for a particular skin type. The occurrence of side effects was not significantly different between three Laser systems. CONCLUSION: Both long-pulsed alexandrite and long-pulsed diode Laser systems are effective in the treatment of unwanted Hair, and they are more efficacious than Nd:YAG Laser.
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Laser Hair Removal comparison of long pulsed nd yag long pulsed alexandrite and long pulsed diode Lasers
Dermatologic Surgery, 2004Co-Authors: Navid Bouzari, Alireza Firooz, Hossein Tabatabai, Zahra Abbasi, Yahya DowlatiAbstract:BACKGROUNDAdvances in Laser technology over the past several years have led to the development of numerous Lasers for the treatment of unwanted Hair. Laser wavelength is a key factor influencing treatment efficacy and complication rates.OBJECTIVETo compare the efficacy and safety of Laser Hair remov
David J. Goldberg - One of the best experts on this subject based on the ideXlab platform.
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Laser and light based Hair Removal an update
Expert Review of Medical Devices, 2007Co-Authors: David J. GoldbergAbstract:A variety of Laser technologies are now able to successfully remove unwanted Hair. Successful Removal is based on an understanding of Laser physics and appropriate wavelengths, pulse durations and cooling of the skin. Although ruby Lasers were among the first to be used, alexandrite, diode and neodymium-doped yttrium aluminium garnet (Nd:YAG) Lasers, as well as a variety of broad-spectrum intense pulsed light sources, are currently more commonly used for the treatment of unwanted Hair. Darker skin types are more difficult to treat but can also be treated. Complications can occur after Laser Hair Removal but can be reduced through an understanding of the fundamentals of Laser Removal. These complications include the obvious, such as scarring and pigmentary changes, and the not so obvious, such as reticulate erythema and uveitis. Laser Hair Removal is now widely accepted as a successful approach to remove unwanted Hair in both men and women. The future will involve office-based Laser and light source Hair Removal, as well as a variety of Laser and light-based home devices.
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evaluation of a new super long pulsed 810 nm diode Laser for the Removal of unwanted Hair the concept of thermal damage time
Dermatologic Surgery, 2002Co-Authors: Arlene S Rogachefsky, Sirunya Silapu, David J. GoldbergAbstract:background. Laser Hair Removal is based on the dual concepts of selective photothermolysis and thermal relaxation time. In most Laser Hair Removal systems, light with emitted pulse durations of 2–50 msec targets Hair follicles. A novel concept of Laser Hair Removal uses the thermal damage time rather than the thermal relaxation time of the Hair follicle. The follicle's thermal damage time is the amount of time required for diffusion of delivered Laser energy from the treated Hair to follicular-associated Hair stem cells. This can range from 170 to 1000 msec. objective. To investigate the theory of thermal damage time, we performed a pilot study to evaluate the clinical efficacy and side effect profile of a modified 810 nm diode Laser device operating in a super-long-pulse mode (200–1000 msec). methods. Ten female subjects with Fitzpatrick skin types I–VI received either one or two Laser treatments at eight test sites. Super-long pulse durations of 200–1000 msec were evaluated with delivered fluences ranging from 23 to 115 J/cm2. Subjects were followed for 6 months after the first treatment. Subjects were evaluated for Hair Removal efficiency, optimal pulse duration and delivered fluence, and associated complication rate. results. The clinical results show that safe Hair Removal in all skin types can be accomplished with an 810 nm diode Laser delivering super-long pulse durations. Pain and complications were greatest at the highest pulse duration (1000 msec) and the highest fluence (115 J/cm2). Optimal Hair reduction at 6 months (31%) was achieved at a thermal diffusion time of 400 msec (46 J/cm2). conclusion. The super-long pulsed 810 nm diode Laser can safely remove unwanted Hair in a full variety of skin types. Pain and increased risk of complications may preclude the use of the Laser at very high fluences and pulse duration in the range of 1000 msec.
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evaluation comparing multiple treatments with a 2 msec and 10 msec alexandrite Laser for Hair Removal
Lasers in Surgery and Medicine, 1999Co-Authors: David J. Goldberg, Rosaline AhkamiAbstract:Background and Objectives There are a variety of different Laser Hair Removal systems currently available. There are also systems with identical emitted wavelengths; yet their emitted pulse durations vary. There are few data comparing these systems in an objective manner. Study Design/Materials and Methods Fourteen subjects received three treatments with two different pulse duration 755-nm alexandrite Lasers. Paired anatomic sites were treated three times with both a 2-msec and a 10-msec system. Subjects were evaluated prior to Laser treatment and 6 months after the three treatments with manual Hair counts and incidence of complications. Results The average percentage of Hair reduction was 33.1% for the 2-msec-pulse duration and 33.9% for the 10-msec-pulse duration alexandrite Laser. No cutaneous pigmentary changes or scarring was noted 6 months after the final treatment. Conclusion The alexandrite Laser is effective in removing unwanted Hair. There was no difference in response between a 2-msec and a 10-msec alexandrite Laser. Lasers Surg. Med. 25:223–228, 1999. © 1999 Wiley-Liss, Inc.
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topical suspension assisted q switched nd yag Laser Hair Removal
Dermatologic Surgery, 1997Co-Authors: David J. Goldberg, Curt M. Littler, Ronald G WheelandAbstract:background Many individuals seek to decrease facial and body Hair density. Although a variety of epilating methods are available, improved techniques would be of interest to patients and physicians alike. objective To determine the safety and clinical efficacy of a new Laser-based method of Hair Removal. methods A Q-switched Nd:YAG Laser was used to scan skin with increased Hair after applying a topical carbon-based solution. Thirty-five healthy, adult volunteers were treated with a single treatment to selected facial, neck, and axillary sites. results Twelve weeks after a single treatment, integrated site scores revealed that the majority of patients had over 25% fewer Hairs. The 12-week mean percentage of Hair reduction, based on anatomic sites, ranged up to 66% and 44% as judged by physicians and subjects, respectively. Adverse events were minimal and temporary. conclusion Topical suspension-assisted Q-switched Nd:YAG Laser therapy reduces Hair density after a single treatment. Advantages include its speed, technical ease, and minimal adverse effects.
Sorin Eremia - One of the best experts on this subject based on the ideXlab platform.
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Laser Hair Removal long term results with a 755 nm alexandrite Laser
Dermatologic Surgery, 2001Co-Authors: Sorin Eremia, Sanusi Umar, Cindy Y Li, Nathan NewmanAbstract:BACKGROUND. Hypertrichosis is a common problem for which Laser Hair Removal is becoming the treatment of choice. Optimal wavelength, pulse duration, spot size, fluence, and skin cooling parameters for various skin types have not yet been firmly established. OBJECTIVE. To evaluate the long-term efficacy and safety of a 3-msec 755 nm alexandrite Laser equipped with a cryogen cooling device for patients with Fitzpatrick skin types I-V. METHODS. Eighty-nine untanned patients with skin types I-V underwent a total of 492 treatments of Laser Hair Removal over a 15-month period. Each patient in the study underwent a minimum of three treatment sessions spaced 4-6 weeks apart (mean treatments 5.6). Retrospective chart review and patient interviews were used to establish Hair reduction results. Treatment sites included the axillae, bikini, extremities, face, and trunk. A 3-msec pulse width, 755 nm alexandrite Laser equipped with a cryogen spray cooling device was used in this study. Spot sizes of 10-15 mm were used. A spot size of 10 mm was used for fluences greater than 40 J/cm 2 , a spot size of 12 mm was used for fluences of 35-40 J/cm 2 , and spot sizes of 12 and 15 mm were used for fluences less than 30 J/cm 2 . Fluences ranging from 20 to 50 J/cm 2 (mean fluence 36 J/cm 2 ) were used. RESULTS. The patients had a mean 74% Hair reduction. Skin type I patients had an average of 78.5% Hair reduction using a mean fluence of 40 J/cm 2 (35-50 J/cm 2 ) and a 10-12 mm spot size (12 mm in more than 95% of treatments). Skin type II patients had a mean 74.3% Hair reduction using a mean fluence of 38 J/cm 2 (30-40 J/cm 2 ) and a 12-15 mm spot size. Skin type III patients had a mean 73.4% Hair reduction using a mean fluence of 37 J/cm 2 (25-40 J/cm 2 ) and a 12-15 mm spot size. Skin type IV patients had a mean 71.0% Hair reduction using a mean fluence of 31 J/cm 2 (25-35 J/cm 2 ) and a 12-15 mm spot size. A patient with skin type V had a 60% Hair reduction using a mean fluence of 23 J/cm 2 (20-25 J/cm 2 ) and a 12-15 mm spot size. The efficiency of Hair Removal directly correlates significantly with the fluence used. Rare side effects included transient postinflammatory hyperpigmentation (n = 9; 10%), burn with blisters (n = 1; 1%), and postinflammatory hypopigmentation (n = 2; 2%). All complications resolved without permanent scarring. CONCLUSION. The 3-msec cryogen cooling-equipped alexandrite Laser can safely and effectively achieve long-term Hair Removal in patients with skin types I-V. The best results are achieved in untanned patients with skin types I-IV.
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Laser Hair Removal with alexandrite versus diode Laser using four treatment sessions 1 year results
Dermatologic Surgery, 2001Co-Authors: Sorin Eremia, Cindy Y Li, Nathan NewmanAbstract:Background. Laser Hair Removal is the treatment of choice for hypertrichosis. The two most commonly used Hair Removal Lasers are compared. Objective. To present the results of a comparative study examining the role of wavelength, fluence, spot size, pulse width, and cooling systems on long-term results after a series of four Laser Hair Removal treatments using the 755 nm alexandrite and 800–810 nm diode Lasers. Methods. The axillae of 15 untanned, type I–V patients were treated side by side four times at 4- to 6-week intervals with a 755 nm, 3-msec pulse width, cryogen spray-equipped alexandrite Laser and an 800 nm, variable pulse width, cooled sapphire window-equipped diode Laser. Each patient was pretested and treated with the maximum fluence tolerated at the largest spot size available for each Laser (12 mm round/113 mm2 for the alexandrite and 9 mm for the diode). Results. Evaluations were done at 3, 6, 9, and 12 months after the last treatment. Twelve-month results with the alexandrite and diode Lasers achieved 85% versus 84% Hair reduction. The fact that tan avoidance was strictly followed permitted the use of relatively high fluences (25–30+ J/cm2) even in type IV patients. For most patients, four treatment sessions using high fluences (30–40 J/cm2) with relatively large spot sizes (12 mm round for the 755 nm alexandrite and 9 mm for the 800 nm diode) resulted in 12-month Hair reductions in the 90% range. Conclusion. Both the alexandrite and diode Lasers in this 12-month study produced excellent long-term Hair reductions.
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topical anesthesia for Laser Hair Removal comparison of spot sizes and 755 nm versus 800 nm wavelengths
Dermatologic Surgery, 2000Co-Authors: Sorin Eremia, Nathan NewmanAbstract:Background. The Candela alexandrite and the Coherent diode Laser systems come equipped with built-in skin cooling systems that are designed to both protect the epidermis, allowing higher fluences, and to alleviate discomfort. Nevertheless, pain can be a significant problem especially with treatment of larger areas. Scatter of the Laser beam is reportedly affected by the spot size. It is claimed that larger spot sizes are more effective at identical fluences. Objective. This study evaluated the effectiveness of a topical 5% lidocaine cream (ELA-Max) to control pain and compared pain levels at identical fluences between the 8 mm and 12 mm spot size of the alexandrite Laser and between the alexandrite and diode Laser with its 9 mm spot size. Methods. The study was conducted in the axillae of 12 patients. Each axilla was divided in half for side-by-side comparison. Half of the right axilla was treated with the alexandrite 8 mm and the other half with the 12 mm spot size at identical fluences. The left axilla was treated at the maximum tolerated fluences with the alexandrite 12 mm spot size and the diode 9 mm spot size. Results. At identical fluences and other parameters, there was significantly more pain with the alexandrite 12 mm spot size than with the alexandrite 8 mm spot size, both with or without topical anesthesia. The alexandrite Laser was significantly less painful than the diode Laser both with and without topical anesthetic. The difference was most noticeable between the alexandrite 8 mm spot size and the diode 9 mm spot size. Topical 5% lidocaine anesthesia was effective in reducing pain, though not completely, for both the alexandrite and the diode Lasers. Conclusion. Topical 5% lidocaine cream is a simple and effective method for reducing patient discomfort during Laser Hair Removal procedures, even when a skin cooling device is being used. A larger spot size causes more pain than a smaller spot size at identical fluences. The 800 nm diode Laser causes greater discomfort than the 755 nm alexandrite Laser.
