Ablative and fractional lasers

作者：Beylot C^*

来源：Annales de Dermatologie et de Venereologie, 2008, 135: S189-S194.

• ablative lasers
• carbon dioxide laser resurfacing
• Erbium-YAC laser resurfacing
• fractional photothermolysis
• neocollagenesis
• photoaging

The use of pulsed or scanning Carobon Dioxide, and pulsed Erbium-YAC lasers allows the programmable and reproducible photocoagulation of thin layers of the epidermis and superficial dermis. Thermal damage depends on the type of laser and is greater with CO2 lasers. The degree of neocollogenesis is proportional to the thermal damage and is better with CO2 lasers. Their main indication is the correction of photoaged facial skin but they can also be used for corrective dermatology, e.g. for scars and genodermotosis. Results are highly satisfactory but the technique is invasive and the patient experiences a social hindrance Of around two weeks. The fractional techniques such as Fraxel are used to treat non-adjacent microzones; without oblation of the epidermis. Around 25 p. 100 of the affected region is treated per session without ablation of the epidermis. Each fraction is only mini-invasive and is performed under local anesthesia. Social hindrance is minimal. Nonetheless, the results are inferior to those obtained with ablative losers, especially regarding deep wrinkles. The treatment is costly and four sessions are usually required to treat the whole affected area. Others regions of the face may also be treated. Encouraging results have been obtained with melasma.

• 出版日期2008-2
• 单位河南工业大学