TABLE 1.

Assessment criteria used for the classification of the technical quality of root fillings

Technical variable Assessment criteria	Apical extension		Density
	Acceptable	Unacceptable	Acceptable	Unacceptable
	Filling material ends 0–2 mm short of the radiographic apex	Filling material ends >2 mm from the radiographic apex or extruded beyond the apex	No voids present within the material or between the material and the root canal walls	Voids are present within the material or between the material and the root canal walls