In vitroComparison of Apical Debris Extrusion Using Rotary and Reciprocating Systems in Severely Curved Root Canals.
BACKGROUND
The aim of thisin vitrostudy was to compare the amount of apically extruded debris after root canal preparation using rotary and reciprocating systems in severely curved root canals.


METHODS
Thirty six extracted human mandibular first molars with 25-35°curvature in their mesiobuccal (MB) canal (according to Schneider's method) were cleaned and shaped with ProTaper and WaveOne systems. The extruded debris was collected and their net weight was calculated. To compare the efficiency of the two systems, the operation time was also measured. The data were analyzed with t-test.


RESULTS
The amount of extruded debris in WaveOne group was significantly greater in comparison with ProTaper group (26%). The operating time for ProTaper was however, significantly longer than WaveOne.


CONCLUSIONS
Both root preparation systems caused some degree of debris extrusion through the apical foramen. However, this amount was greater in WaveOne instruments.
Dental Material Research Center, Dental Branch, Azad University, Tehran, Iran.
Abbas
A
Delvarani
Department of Endodontics, Cranio-maxillo-facial Research Center, Dental Branch, Islamic Azad University, Tehran, Iran.
Nahid
N
Mohammadzadeh Akhlaghi
Private Practice, Mianeh, East Azerbaijan, Iran.
Raana
R
Aminirad
Dental Material Research Center, Dental Branch, Azad University, Tehran, Iran.
Sohrab
S
Tour Savadkouhi
Department of Endodontics, Dental School, Loma Linda University, CA, USA.
Seyed Aliakbar
SA
Vahdati
Apical Extrusion; Curved Canals; Reciprocating File; Root Canal Preparation; Rotary Instrumentation