BACKGROUND:Botulinum toxin type A (BTA) has been used on facial expressive muscles to reduce wrinkles. We assumed that intradermal injection with BTA on the middle and lower face can produce face-lifting and wrinkles-soothing effect by promoting collagen synthesis. METHODS:Nine volunteers were included to undergo intradermal injections of a total dose of 20~25 U BTA into one-half of the face, and normal saline into the other half as control. Clinical photographs were taken every 4 weeks for 16 weeks, and evaluated by a doctor blinded to the assignments. Patients graded the results of wrinkles elimination on each follow-up. Skin biopsies were taken before the treatment and 8 weeks after the injection. The specimens were assessed by a pathologist using hematoxylin and eosin stain, elastin stain, Masson trichrome stain and immunohistochemical stain with type I procollagen. RESULTS: By photographic documentation, there was no significant face-lifting effect. However, there was statistical significance in wrinkles reduction on the BTA sides compared to pre-treatment. Subjectively, six subjects noticed better wrinkles soothing effect on the BTA sides. This effect was noted as early as 4 weeks after injection, and lasted for a minimum 8 weeks. The histologic examination revealed slight neocollagen synthesis by Masson trichrome stain on both sides. CONCLUSIONS: Based on this pilot study, the face-lifting effect of intradermal injection with BTA was not conclusive. Interestingly, BTA showed moderate but significant wrinkles-soothing effect without obvious side effects on the lower face.
RCT Entities:
BACKGROUND: Botulinum toxin type A (BTA) has been used on facial expressive muscles to reduce wrinkles. We assumed that intradermal injection with BTA on the middle and lower face can produce face-lifting and wrinkles-soothing effect by promoting collagen synthesis. METHODS: Nine volunteers were included to undergo intradermal injections of a total dose of 20~25 U BTA into one-half of the face, and normal saline into the other half as control. Clinical photographs were taken every 4 weeks for 16 weeks, and evaluated by a doctor blinded to the assignments. Patients graded the results of wrinkles elimination on each follow-up. Skin biopsies were taken before the treatment and 8 weeks after the injection. The specimens were assessed by a pathologist using hematoxylin and eosin stain, elastin stain, Masson trichrome stain and immunohistochemical stain with type I procollagen. RESULTS: By photographic documentation, there was no significant face-lifting effect. However, there was statistical significance in wrinkles reduction on the BTA sides compared to pre-treatment. Subjectively, six subjects noticed better wrinkles soothing effect on the BTA sides. This effect was noted as early as 4 weeks after injection, and lasted for a minimum 8 weeks. The histologic examination revealed slight neocollagen synthesis by Masson trichrome stain on both sides. CONCLUSIONS: Based on this pilot study, the face-lifting effect of intradermal injection with BTA was not conclusive. Interestingly, BTA showed moderate but significant wrinkles-soothing effect without obvious side effects on the lower face.
Authors: Reíssa Alves Vilela; José de Brito Lourenço Junior; Manuel Antonio Chagas Jacintho; Antonio Vinícius Correa Barbosa; Messy Hannear de Andrade Pantoja; Carlos Magno Chaves Oliveira; Alexandre Rossetto Garcia Journal: Front Vet Sci Date: 2022-05-25
Authors: Hema Sundaram; Po-Han Huang; Nai-Jen Hsu; Chang Hun Huh; Woffles T L Wu; Yan Wu; Daniel Cassuto; Martina J Kerscher; Kyle Koo-Il Seo Journal: Plast Reconstr Surg Glob Open Date: 2016-12-07