AIM: To evaluate PGCA after using two different rotary instruments(K3 and Protaper) and two different obturation techniques(Lateral condensation  and Thermafil)

MATERIALS AND METHODS: 80 freshly extracted maxillary central incisors were randomly divided into 4 groups, each consisting of 20 specimens based on instruments and obturation techniques. Group A1– Protaper/Lateral condensation(PLC); Group A2– Protaper/Thermafil(PT); Group B1– K3/Lateral Condensation(K3LC); Group B2– K3 / Thermafil(K3T). Transverse sections of filled root canal were made at 2,4,6 and 8mm respectively from apex. Digital images of sections were taken under stereomicroscope at 40 X magnification. PGCA of each section were calculated using image J 1.38 analyser software.

RESULTS: PT  group showed significant highest PGCA followed by K3T group compared to other groups at all transverse section levels.

CONCLUSION: Thermafilshowed superior filling quality than lateral condensation.