Table 2: Criteria for the evaluation of root canal fillings.

Quality variableCriteriaDefinition

LengthAdequateFilling ends are 0.5 to 2 mm from the radiographic apex
OverfilledFilling extends beyond the radiographic apex
UnderfilledFilling ends are shorter than 2 mm from the radiographic apex

TaperAdequateA consistent taper from coronal to apical aspects with good canal shape
InadequateInconsistent taper

DensityAdequateUniform density without clear presence of voids