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Table 1 The mean distance from the tip of root canal filling to radiographic apex and the mean total number of radiographs in group I and group II.

From: Comparison between two methods of working length determination and its effect on radiographic extent of root canal filling: a clinical study [ISRCTN71486641]

Variable Group I Group II
  Number Mean SD Number Mean SD
Mean distance from tip of root canal filling to radiographic apex (mm) 67 -0.5 0.5 84 -0.4 0.5
Number of Radiographs (mean) 67 2.0 0.1 84 3.2 0.5
  1. SD = standard deviation