Table 1: Selection criteria of the teeth.

Selection Criteria
Inclusion criteria   - Teeth selected were within these variables; length of each root:13 ± 2 mm and mesiodistal width at cervix: 7 ± 0.4 mm.
Exclusion criteria - absence of root-surface caries, visible fracture lines, abrasions and abfractions, crown fractures and previous restorations.
- Internal root resorption/ obstruction in the root canal.