Cement Line Cracks

       As in the case of intra-osteonal cracks, arc length per area is the measure analyzed in cement line cracks. There is no significance in the interaction of hole type, proximity to the hole, and strain level (P-0.733). No significance results when the strain level is eliminated from the model (P-0. 184). Significance results in relation to the hole type (P-<0.0001). Further analysis reveals a marked difference between foramen and drilled sections, and between foramen and control regions (for both cases P- <0.0001), where the foramen CLC lead considerably (Figure 3-13). No significance is expressed between the control and the drill regions; unexpectedly, the control hole shows a slightly higher value in arc length per area than the drill hole, while the foramen has the highest amount of cracks of this type (Table 3-10).


         6

         5                                      ab
       C14 E
       E 4
       :5
                 a               b


         2



         0
                 Control          Drilled        Forarnen


Figure 3-13: Interactive bar plot for cement line cracks and the effect of hole type. Table 3-10: Descriptive statistics for cement line cracks.
                               Cement line cracks Std.
                       Hole Type       Mean      Dev
                       Control         2.54        0.82
                       Drilled          2.5        0.74
                       Foramen          4.3         1.8