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Effects of Static Magnetic Fields on Bone Formation in Rat Osteoblast Cultures

¹ Departments of Orthodontics,
² Oral Anatomy and Cell Biology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; and
³ Department of Oral Anatomy, Kyushu Dental College 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu 803-8580, Japan;

View larger version (25K): [in a new window]   Figure 1. Diagrammatic representation of magnet placement (A) and the distribution of magnetic flux density (B).

View larger version (32K): [in a new window]   Figure 2. Effect of SMF on mineralized bone nodule formation in rat calvaria cell cultures. Photograph of wells after von Kossa staining (A), time-course of total area (B), number of bone-like nodules (C), and calcium content in the cell matrices (D). Filled circles, exposed to SMF; open circles, non-exposed controls. Data are presented as mean ± SD (n = 4). Asterisks show a significant difference from control values at *P < 0.05 and **P < 0.01, by Student’s t test.

View larger version (13K): [in a new window]   Figure 3. Effect of SMF on growth of rat calvaria cells (A), ROS 17/2.8 cells (B), and UMR 106 cells (C). Filled circles, exposed to SMF; open circles, non-exposed controls. Data are presented as mean ± SD (n = 4).

View larger version (22K): [in a new window]   Figure 4. Effect of SMF on two markers of osteoblastic phenotype: ALP activity in rat calvaria cells (A), ROS 17/2.8 cells (C), and UMR 106 cells (D); and osteocalcin content in the conditioned media of rat calvaria cell cultures (B). Filled circles and bars, exposed to SMF; open circles and bars, non-exposed controls. Data are presented as mean ± SD (n = 4). Asterisks show a significant difference from control values at *P < 0.05 and **P < 0.01, by Student’s t test.