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Table 3 The mean total number of radiographs in group I and group II in different subgroups.

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
Tooth Position Premolar teeth 17 2.0 0 19 3.1 0.3
  Molar teeth 50 2.0 0.1 57 3.2 0.5
  Upper teeth 36 2.0 0 55 3.2 0.5
  Lower teeth 32 2.0 0.1 29 3.1 0.4
Tooth Status Vital 19 2.0 0.2 24 3.4 0.7
  Non- vital 48 2.0 0 50 3.1 0.3