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. 2018 Nov 13;234(2):274–290. doi: 10.1111/joa.12912

Figure 9.

Figure 9

Graphs summarizing distance between rod profiles (spacing) across the four regions of the enamel layer within the inner and outer enamel layers and near the CEJ. Graphs summarizing distance between rod profile (spacing) across the four regions of the enamel layer (1, lateral; 2, mid lateral, 3, central labial; 4, mesial) relative to the inner enamel layer (IE), the outer enamel layer (OE) and near the CEJ. Data are from 24 mandibular incisors of 18 mice Inner enamel: n = 62 986 mesial tilt, n = 56 337 lateral tilt; outer enamel: n = 46 120; CEJ: n = 5183. The tightest packing together of rod profiles occurs in the central labial region (3) of the outer enamel layer (right panel) followed by the central labial and mesial (4) regions of the inner enamel layer for rod profiles having a mesial tilt (left panel). The widest spacing of rod profiles occurs in the mesial region of the inner enamel layer for rod profiles having a lateral tilt (left panel). Rod profile spacing in both the inner and outer enamel layers shows a trend to increase in a lateral direction (region 3 toward region 1) and to increase in a mesial direction, but only within the outer enamel layer (region 3 toward region 4). Rod profile spacing near the CEJ is similar at the mesial and lateral sides and is intermediate in distance between spacing seen in the inner and outer enamel layers.