Treatment of Neck Lines and Forehead Rhytids with a Nonablative 1540-nm Er:Glass Laser: A Controlled Clinical Study Combined with the Measurement of the Thickness and the Mechanical Properties of the Skin

Dahan, Serge; Lagarde, Jean Michel; Turlier, Virginie; Courrech, Laetitia; Mordon, Serge

doi:10.1111/j.1524-4725.2004.30256.x

Cited by 50 publications

(42 citation statements)

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“…Some of the most common include suction tests (Alexander and Cook 1977;Elsner et al 1990;Diridollou et al 1998;Hendriks et al 2003), torsion tests (Escoffier et al 1989), indentation tests (Highley 1977), uniaxial tests (Snyder and Lee 1975), biaxial tests (Lanir and Fung 1974a;Schneider et al 1984) and multiaxial tests (Reihsner et al 1995). Recent work has tended to focus toward applying suction devices in combination with either an ultrasound (Diridollou et al 2000(Diridollou et al , 2001Hendriks et al 2003;Dahan et al 2004) or an OCT imaging device (Hendriks et al 2004) to measure the stress distribution in deformed skin. These devices are, however, inadequate for modelling purposes as they do not account for the anisotropic nature of skin.…”

Section: Introductionmentioning

confidence: 97%

Estimating material parameters of human skin in vivo

Kvistedal

Nielsen

2007

Biomech Model Mechanobiol

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An accurate mathematical representation of the mechanical behaviour of human skin is essential when simulating deformations occurring in the skin during body movements or clinical procedures. In this study constitutive stress-strain relationships based on experimental data from human skin in vivo were obtained. A series of multiaxial loading experiments were performed on the forearms of four age- and gender matched subjects. The tissue geometry, together with recorded displacements and boundary forces, were combined in an analysis using finite element modelling. A non-linear optimization technique was developed to estimate values for the material parameters of a previously published constitutive law, describing the stress-strain relationship as a non-linear anisotropic membrane. Ten sets of material parameters where estimated from the experiments, showing considerable differences in mechanical behaviour both between individual subjects as well as mirrored body locations on a single subject. The accuracy of applications that simulate large deformations of human skin could be improved by using the parameters found from the in vivo experiments as described in this study.

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Section: Introductionmentioning

confidence: 97%

Estimating material parameters of human skin in vivo

Kvistedal

Nielsen

2007

Biomech Model Mechanobiol

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“…In the long-term follow-up (from 6 months to 2 years) the average reduction of the acne was between 72 and 75%. A number of studies [75,76] have indicated not only a considerable improvement in skin defects but also a general recovery of the surrounding tissues after non-ablative FP.…”

Section: Reviewsmentioning

confidence: 99%

“…Studies [75] showed the effect of non-ablative fractional laser treatment of wrinkles on the neck and forehead by 3 months after treatment. Their smoothing, as well a significant increase in thickness and resilience of the skin in general, was registered.…”

Section: Reviewsmentioning

confidence: 99%

Fractional Laser Photothermolysis in the Treatment of Skin Defects: Possibilities and Effectiveness (Review)

Karabut¹,

Gladkova²,

Feldchtein³

2016

Sovrem Tehnol Med

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Nizhny Novgorod State Medical Academy, 10/1 Minin and Pozharsky Square, Nizhny Novgorod, 603005, Russian Federation For skin defect treatment and rejuvenation the ablative laser skin resurfacing with a CO 2 laser is widely applied in cosmetology and dermatology. However this treatment can result in the risk of undesirable side effects and requires a long-term recovery after the procedure. When non-ablative laser skin rejuvenation is used as an alternative, the level of safety is increased, however the efficacy of the procedure is considerably reduced.The use of fractional laser photothermolysis is a particularly important step in the development of laser technology for cosmetology and dermatology. Due to the creation of only microscopic areas of thermal damage under the laser exposure, this method results in safe, quick healing and complete recovery of the skin without any undesirable side effects. The review presented here illustrate the high efficacy of the application of both ablative and non-ablative fractional laser photothermolysis for wrinkles reduction, for general improvement of the skin appearance, for the abnormal pigmentation treatment, and the removal or appearance improvement of atrophic scars from acne as well as in areas of skin stretching (striae).Key words: laser technologies in cosmetology; ablative and non-ablative laser exposure; fractional laser photothermolysis.For contacts: Maria M. Karabut,

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“…For example, the temperature-time relation resulting in the induction of heat shock protein could produce or enhance the wound healing process around the ablated and/or coagulated zone [54]. In the laser bulk heating and dermal coagulation of the dermis, superficial cryogenic or contact cooling is used to protect the epidermis; this treatment modality purportedly stimulates collagen remodeling [49].…”

Section: Trends and Future Direction Of Lasers In Dermatologymentioning

confidence: 99%

“…This is often done with the CO2 and pulsestacked Er:YAG lasers. In laser bulk heating and dermal coagulation of the dermis, superficial cryogenic or contact cooling is used to protect the epidermis; this treatment modality purportedly stimulates collagen remodeling [49]. The former removes superficial pigmentary lesions and flattens fine lines and rhytids, while the latter ' ' reduces rhytids and furrows by an increased volume of the underlying dermal collagen.…”

Section: Trends and Future Direction Of Lasers In Dermatologymentioning

confidence: 99%

The Advent of Laser Therapies in Dermatology and Urology: Underlying Mechanisms, Recent Trends and Future Directions

Lee

Jeong

Chan³

2009

Journal of the Optical Society of Korea

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Following their applications in cardiology, ophthalmology and dentistry among others, the advent of lasers in dermatology and urology had become the success story of the past decade. Laser-assisted treatments in dermatology and urology are mainly based on the laser-induced tissue injury/coagulation and/or ablation, depending upon the desirable clinical endpoint. In this review, we discussed the underlying mechanisms of the laser induced tissue ablation. In any medical laser application, the controlled thermal injury and coagulation, and the extent of ablation, if required, are critical. The laser thermal mechanism of injury is intricately related to the selective absorption of light and its exposure duration, similarly to the laser induced ablation. The laser ablation mechanisms were categorized into four different categories (the photo-thermally induced ablation, the photo-mechanically induced ablation, the plasma induced ablation and the photoablation) and their fundamentals are herein described. The brief history of laser treatment modality in dermatology and urology are summarized.

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Treatment of Neck Lines and Forehead Rhytids with a Nonablative 1540-nm Er:Glass Laser: A Controlled Clinical Study Combined with the Measurement of the Thickness and the Mechanical Properties of the Skin

Abstract: This study demonstrates that irradiation with a 1540-nm Er:Glass laser emitting in a pulsed mode and coupled with an efficient contact cooling system increases dermal thickness and firmness, leading to a clinical improvement of neck lines and forehead rhydits.

Cited by 50 publications

References 50 publications

Estimating material parameters of human skin in vivo

Estimating material parameters of human skin in vivo

Fractional Laser Photothermolysis in the Treatment of Skin Defects: Possibilities and Effectiveness (Review)

The Advent of Laser Therapies in Dermatology and Urology: Underlying Mechanisms, Recent Trends and Future Directions

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