How did you perform in the last Q&A class? We have prepared detailed answers and analysis. Now let's review and test your learning results together!

1. What does the size of the laser energy directly affect?
A. Color of laser
B. Pulse frequency of laser
C. Effect and safety of laser treatment
D. Cost of laser treatment

Answer: C
Analysis:The effect and safety of laser treatment are directly affected by the laser energy. During laser treatment, too high energy may cause excessive thermal effect, damage skin tissue, and even cause side effects such as burns or pigmentation. If the laser energy is too low, it may not be able to effectively act on the target tissue, resulting in insignificant treatment effect. Therefore, the energy of the laser needs to be precisely controlled. Especially when using long-pulse lasers, it is particularly important to control the appropriate energy output, because long-pulse lasers can selectively photothermally act, so that the energy acts more accurately on the target tissue, reducing damage to surrounding normal tissues, thereby improving the safety and effectiveness of treatment.

2. Why does laser energy need to be precisely controlled when removing spots with laser?
A. To increase the penetration depth of the laser
B. To avoid damage to the surrounding normal skin
C. To make the treatment cheaper
D. To increase the temperature of the laser

Answer: B
Analysis:In the treatment process of laser removal of pigmentation, the control of laser energy is particularly important. Long-pulse lasers focus laser energy on the pigment particles where the pigmentation is located through the mechanism of selective photothermal action, which can effectively destroy the pigment without damaging the surrounding healthy skin. However, if the energy is too high, the thermal effect of the laser may spread to normal skin tissue, causing unnecessary damage such as skin burns or pigmentation. Therefore, precise control of laser energy can ensure the accuracy of treatment, so that the pigmentation is fully removed while avoiding damage to the surrounding skin. At the same time, the longer pulse time of long-pulse lasers helps to smoothly transfer heat, further reducing the risk of damage to normal skin.

3. In laser skin resurfacing treatment, what is the most important purpose of laser energy control?
A. Remove all skin cells
B. Cut deeper skin tissue
C. Remove dead skin cells on the surface and promote the formation of new skin
D. Heat the skin surface

Answer: C
Analysis:The core purpose of laser skin resurfacing treatment is to improve skin texture and appearance by removing dead skin cells on the surface of the skin and stimulating collagen regeneration in the deeper layers of the skin. Long pulse laser plays a key role in this process because it can gently and effectively heat the cells on the surface of the skin through a longer pulse time, causing the damaged epidermis to fall off naturally, while stimulating collagen synthesis in the lower layer of the skin. Precise control of laser energy is very important. Too strong energy may cause excessive burning, damage too many skin cells, and cause side effects; while too low energy may result in ineffective treatment. Therefore, reasonable energy control can not only ensure the treatment effect, but also reduce patient discomfort and risks.

4. What is the main role of laser energy in laser skin tightening treatment?
A. Cutting skin tissue
B. Heating deep collagen to promote contraction and regeneration
C. Removing spots
D. Increasing skin hydration

Answer: B
Analysis:Laser skin tightening treatment uses laser energy to act on the dermis of the skin, especially collagen, with the aim of shrinking collagen through thermal effects and stimulating its regeneration. The advantage of long pulse lasers is that their longer pulse time can transmit heat deeper into the underlying skin, promoting the contraction and regeneration of collagen, thereby achieving skin firmness and elasticity restoration. This treatment does not rely on traditional epidermal removal, but rather achieves the effect of promoting skin regeneration by gently heating deep tissues. The control of laser energy is crucial in this treatment, because too high energy will lead to excessive thermal effects and may damage the skin structure; while too low energy may not effectively stimulate the regeneration of collagen. Therefore, precise energy control can ensure the treatment effect while avoiding excessive damage.

5. What is the most important feature of long pulse laser in laser medical aesthetics?
A. Provides shorter treatment time
B. Suitable for rapid treatment of the skin surface
C. Has a longer pulse time and can deliver energy more gently
D. Can only be used to remove spots

Answer: C
Analysis:A notable feature of long pulse laser is its longer pulse duration, which allows it to deliver energy more gently during treatment. Compared with short pulse laser, long pulse laser can control the release of energy more finely, making the thermal effect more stable and uniform when acting on the target tissue. This method minimizes the damage to the skin during the treatment process, especially for those projects that require deep treatment, such as laser skin tightening and repair of deep wrinkles. Under the mechanism of selective photothermal action, long-pulse lasers can deliver concentrated energy to target tissues, such as pigmentation or collagen, to achieve precise treatment while avoiding unnecessary thermal damage to surrounding normal tissues. In general, the gentleness and precision of long-pulse lasers make them an ideal choice for many laser medical aesthetic treatments.