Fig. 7From: Establishment of perpendicular protrusion of type I collagen on TiO2 nanotube surface as a priming site of peri-implant connective fibersAverage absorbance of the Amide bond and Ti–OH bond in FTIR-ATR spectra. a Average absorbance at 1550–1700 cm−1 corresponding amido bond. b Average absorbance at 1000–1120 cm−1 corresponding Ti–OH bond. Error bars represent mean ± SD for n = 3, *P < 0.05, **P < 0.01Back to article page