Figure 2.

Lack of mineralized acellular cementum ultrastructure on Bsp^-/- mouse molar teeth. Secondary electron SEM analysis on fractured first molars at 60 dpn indicated that, compared with the mineralized acellular cementum layer visible in WT molars at various magnifications (A, C, E), no mineralized cementum ultrastructure could be identified on the roots of Bsp^-/- molars (B, D, F). Some cracking is evident as an artifact of sample preparation. Abbreviations: enam = enamel; ac = acellular cementum; pdl = periodontal ligament. Scale bar is 50 µm in panels A and B (original, 500X), 10 µm in panels C and D (original, 2,000X), and 2 µm in panels C and D (original, 10,000X).