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Papers of The 3rd Japan Scar Workshop |
14. Tensile Reduction Effects of Silicon Gel Sheeting for The Treatment of Keloids
Satoshi Akaishi, Masataka Akimoto, Rei Ogawa, Teruyuki Dohi, and Hiko
Hyakusoku
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Despite the wide use of silicone gel sheet (SGS) on hypertrophic scars
and keloids, its mechanism of action remains undetermined. Clinicians
have not been satisfied with any hypothesis because SGS has had no
definite effect on scars. In this paper, we focused on the tensile
reduction effects of SGS on scars by visual analysis with finite element
study. The geometry of keloid, normal skin, fat and SGS structures were
reproduced using DISCUS© software. The contours were transferred to
ADINA © analytical software to rebuild the volumes and mesh them.
Moreover, we tested certain conditions (hardness and thickness) of gel
sheets to determine what condition is appropriate to reduce tension
around scars. It was suggested that SGS is effective to reduce the
tension on the boarder between scars and normal skins, however, other
tension was produced on normal skin under the lateral edge of the SGS.
This suggests that SGS transfers the tension from the boarder of scars
to its edge. Moreover, the most efficient hardness condition of SGS
seemed to be 20kPa or less. SGS with hardness of over 20 kPa will likely
result in more side effects such as dermatitis, desquamation, itching or
erythema. The most efficient thickness condition of SGS seemed to be
from half that for normal skin. Thus, SGS that is thicker than normal
skin will result in more side effects. This is the first report on the
tensile reduction effect of SGS. The ideal condition of SGS is
considered to be the same thickness and hardness as normal skin. |
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