For the perfect understanding of the processes involved in the phototherapy protocols, it is indispensable to know the amount of energy deposited and the different tissue responses.It is important to highlight that the cell’s ability to absorb and metabolize energy is limited and, therefore, to reach a certain region in an organized way, we need to adequate the amounts of energy for an even distribution.

In the Phototherapy programs, when we use Quasar Line Equipment, the kind of energy is obtained by light emitting diodes (LED). The blue one (LED) emits a wavelength of 470nm and the red one (LASER), within the band of 660nm. In both cases, we are dealing with a well known band of the electromagnetic spectrum (safe-band), which does not pose risks of genetic alteration for the patient.

Unlike what many people think, the oxygen that we recognize as a basic fluid for life under certain circumstances (under radiation, for example) can be presented in a modality which contains an extremely reactive capacity known as “free radical”. It can be presented as a singlet or triplet oxygen or even hydrogen peroxide.

Preferably, the free radicals associate themselves with hydrogen molecules, stealing electrons from their carbon conjugations, which causes the rupture of bivalent connections among carbon atoms, providing the OXIDATION effect and consequent simplification of carbon compounds, generating the whitening esthetic perception.

Another equally important effect can be observed in the breakdown of water molecules, HYDROLYSIS, which results in immediate ionization with liberation of hydroxyl ions. These ions, when accumulated in the cell membrane, create an alteration effect in the superficial tension, resulting in a provisory esthetic perception of tissue swelling and hardness.

Considerations On Phototherapy Clinical Evolution

Considerations and contraindications:

  1. Erythema classification
  2. Skin type (Phototherapy) “Background panorama” (Comparisons between different skin types are not compatible).

Clinical observations:

  1. Erythema alteration
  2. Spot area reduction
  3. Patient’s report

Factors that should be analyzed:

  1. Age and Sex
  2. Erythema Severity
  3. Prior treatments used
  4. Medication in use
  5. Social and economic factors

Erythema Classification

  1. Mild macular erythema, local;
  2. Moderate macular erythema, diffuse;
  3. Intense papulatum erythema, diffuse;
  4. Intense papulo-nodular erythema, diffuse.

Skin Types (Phototherapy):

  1. Always burns, never tans;
  2. Always burns, sometimes tans;
  3. Sometimes burns, always tans;
  4. Never burns, always tans;
  5. Moderately pigmented races (Chinese, Indians, etc.);
  6. Black-skinned people.