Dissolvable microneedles can cross the stratum corneum without damaging dermal nerves and blood vessels in order to deliver drugs in a similar manner to transdermal patches.
This study showed that a HHP at 200 MPa for 10 min could inactivate the skin without damaging the dermal matrix.
Curcumin treatment therefore leads to HMW DNA damage in dermal fibroblasts.
We speculate that UV light penetrating the epidermis may cause endothelial damage in dermal capillaries.
This procedure damaged the skin by removing the top dermal layers, which became red and shiny, but without observable bleeding.
Acellular human dermal matrix allografts are now being used to augment and sometimes replace severely damaged rotator cuff tissue.
The epidermis and superficial dermis can be selectively damaged by two basic mechanisms: (a) by targeting discrete chromophores in the dermis or at the dermal-epidermal junction or (b) by utilizing mid infrared (IR) lasers.
When compared to mice treated with excision only, there was a 4-fold decrease in tail volumes, 2.5-fold increase in lymphatic transport by lymphoscintigraphy, 40% decrease in dermal thickness, and 54% decrease in scar index in skin-grafted animals, indicating that tissue transfer could bypass damaged lymphatics and promote rapid lymphatic regeneration.
The structure of dermal tissue, which contains mostly collagen, is not only crucial for the mechanical stability of skin, but also acts as a dermal template, providing contact guidance for regulating cell behavior and restoring normal structure and function to skin that has been damaged by injury.
Damaged areas were evaluated using damage (epidermal atrophy, dermal degeneration such as edema and collagen fiber loss, and hair follicle atrophy) percentages, which were scored on 5-points ordinal scale as follows: Grade 0 = normal, Grade 1 = minimal, Grade 2 = mild, Grade 3 = moderate, Grade 4 = marked, and Grade 5 = severe.
