title: Effects of laser biostimulation on the epithelial tissue for keratinized layer differentiation: an in vitro study.
abstract: Gingival augmentation techniques proposed in the international literature do not exclude a surgical component, which determines consequent post-surgical discomfort and results are not always predictable. In recent years, the introduction of laser biostimulation has led to a less invasive approach, particularly in the treatment of periodontally compromised patients, limiting the surgical phase to seriously compromised cases, with regeneration techniques for the restoration of a correct periodontal tissue anatomy. The aim of this in vitro study is to establish the validity of laser biostimulation in order to develop the epithelial keratinized layer of the tissue by stimulating fibroblasts-keratinocytes organotypic cultures and fibroblasts and keratinocytes mono-cultures. We created two groups (test and control), each one composed of 3 fibroblast cultures, 3 keratinocyte cultures and 3 organotypic cultures. We performed laser irradiation of test group with Wiser Doctor Smile Lambda, Flat Top Handpiece, at 50 J/cm2 of fluency with one application every 40 h for a total of 5 applications. Forty-eight h after the last laser application, we investigated the presence and amount of keratins 5 and 8 with citofluorymetric and western blotting analyses. Analyses showed an increase in keratin synthesis in test group cultures, showing a remarkable increase in production of keratin 8 in co-cultures test. Laser biostimulation can considerably enhance keratin synthesis when applied with high energy doses and repeated applications to keratinocytes-fibroblasts co-cultures.
authors.affiliation: Department of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Caccianiga
authors.affiliation: Department of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Cambini
authors.affiliation: Department of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Donzelli
authors.affiliation: Department of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Baldoni
authors.affiliation: Director of CCC en Chirurgie Dentaire Laser-Assistée, University of Paris- Diderot, Paris, France.
authors.forename: G
authors.initials: G
authors.lastname: Rey
authors.affiliation: Department of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Paiusco
mesh_terms: D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000528:radiation effects*; D002478:Cells, Cultured; D004848:Epithelium / Q000528:radiation effects*; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects; D005881:Gingiva / Q000166:cytology / Q000528:radiation effects; D006801:Humans; D015603:Keratinocytes / Q000166:cytology* / Q000528:radiation effects*; D028022:Low-Level Light Therapy