title: Laser therapy accelerates initial attachment and subsequent behaviour of human oral fibroblasts cultured on titanium implant material. A scanning electron microscope and histomorphometric analysis.
abstract: The aim of the study was to investigate the effect of low-level laser therapy (LLLT) on attachment and proliferation of human gingival fibroblasts (HGF) cultured on titanium implant material. HGF were exposed to gallium-aluminum-arsenide diode laser at dosages of 1.5 or 3 J/cm(2) and then cultured on commercially pure titanium discs. Cell profile areas were measured after 1, 3 and 24 h, using scanning electron microscopy and an automatic image analyzer. The results were expressed as percentage of attachment. In order to investigate the effect of LLLT on cellular growth after 8 and 10 days, HGF were cultured on titanium discs for 24 h and then exposed to laser irradiation on 3 consecutive days. Colony-forming efficiency (CFE) and clonal growth rates (CGR) were measured. Cell viability was determined by Hoechst and prodidium iodide staining. Non-lased cultures served as controls. Morphologically, the cells spread well on all titanium surfaces, indicating good attachment by both irradiated and non-irradiated cells. Fibroblasts exposed to laser irradiation had significantly higher percentages of cell attachment than the non-exposed cells (P<0.05). CFE and CGR were also enhanced for the irradiated cells (P<0.05). Cell viability was high (>90%) in the irradiated and control groups, without significant differences. It is concluded that in vitro LLLT enhances the attachment and proliferation of HGF on titanium implant material.
authors.affiliation: Department of Oral Surgery and Oral Medicine, Faculty of Dentistry, University of Oslo, Oslo, Norway.
authors.forename: Maawan
authors.initials: M
authors.lastname: Khadra
authors.forename: Nesrin
authors.initials: N
authors.lastname: Kasem
authors.forename: Ståle Petter
authors.initials: SP
authors.lastname: Lyngstadaas
authors.forename: Hans R
authors.initials: HR
authors.lastname: Haanaes
authors.forename: Kamal
authors.initials: K
authors.lastname: Mustafa
mesh_terms: D002448:Cell Adhesion / Q000528:radiation effects; D049109:Cell Proliferation / Q000528:radiation effects*; D002478:Cells, Cultured / Q000528:radiation effects; D015921:Dental Implants; D005347:Fibroblasts / Q000502:physiology / Q000528:radiation effects*; D005881:Gingiva / Q000528:radiation effects; D006801:Humans; D028022:Low-Level Light Therapy; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014025:Titanium
chemical_list: D015921:Dental Implants; D014025:Titanium