INTERNATIONAL JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY, cilt.43, sa.12, ss.1514-1521, 2014 (SCI-Expanded)
We investigated the effect of hyperbaric oxygen therapy (HBOT) on rat muscles during tibial distraction osteogenesis (DO) at normal and hyperdistraction rates. Animals in groups 1 and 2 were distracted by 0.5 mm/day and those in groups 3 and 4 by 1 mm/day. Groups 2 and 4 received HBOT during distraction. Group 5 served as control. Superoxide dismutase (SOD; U/g protein), malondialdehyde (nmol/g protein), glutathione (mmol/g protein), and protein levels (g/dl) were determined. SOD was significantly higher in group 2 (4.59 +/- 0.97) than in controls (2.19 +/- 0.7) (P = 0.0001), and lower in group 4 (3.74 +/- 1.70) than in group 2 (P = 0.011). Malondialdehyde was significantly higher in group 2 (0.72 +/- 0.23) than in controls (0.38 +/- 0.10) (P = 0.005). Total protein levels were better preserved with HBOT in distracted muscles: group 2 (3.24 +/- 0.37) vs. group 1 (1.88 +/- 0.60), and group 4 (3.45 +/- 0.70) vs. group 3 (2.03 +/- 0.75) (both P = 0.0001). Numbers of fibres were lower in group 1(4.88 +/- 0.59) than in group 2 (6.07 +/- 0.86), and in group 3 (5.13 +/- 0.36) than in group 4 (6.14 +/- 0.74) (both P = 0.001). Numbers of nuclei were higher in group 1 (11.29 +/- 2.47) than in group 2 (9.03 +/- 1.53) (P = 0.04), and in group 3 (12.43 +/- 3.32) than in group 4 (9.08 +/- 1.58) (P = 0.001). Fibres and nuclei with HBOT were similar to those of controls. HBOT decreased the inflammatory cell infiltrate for group 1(19.8 +/- 8.54) vs. group 2 (4.2 +/- 2.53) and group 3 (36.54 +/- 11.29) vs. group 4 (21.5 +/- 9.23) (both P = 0.001). HBOT improves the adaptation of distracted muscle by increasing fibres and antioxidants while decreasing inflammation.