Effectiveness of different final irrigation protocols in removing debris in flattened root canals.
This study evaluated in vitro the capacity of debris removal from the apical third of flattened root canals, using different final irrigation protocols. Thirty human mandibular central incisors with a mesiodistal flattened root were prepared using rotary instrumentation by Endo-Flare 25.12 and Hero 642 30.06, 35.02, 40.02 files, irrigated with 2 mL of 1% NaOCl after each file. The specimens were randomly distributed into 5 groups according to the final irrigation of root canals: Group I: 10 mL of distilled water (control), Group II: 10 mL of 1% NaOCl for 8 min, Group III: 2 mL of 1% NaOCl for 2 min (repeated 4 times), Group IV: 10 mL of 2.5% NaOCl for 8 min, and Group V: 10 mL of 2.5% NaOCl for 2 min (repeated 4 times). The apical thirds of the specimens were subjected to histological processing and 6-microm cross-sections were obtained and stained with hematoxylin-eosin. The specimens were examined under optical microscopy at x40 magnification and the images were subjected to morphometric analysis using the Scion image-analysis software. The total area of root canal and the area with debris were measured in square millimeters. Analysis of variance showed no statistically significant difference (p>0.05) among the groups GI (2.39 +/- 3.59), GII (2.91 +/- 2.21), GIII (0.73 +/- 1.36), GIV (0.95 +/- 0.84) and GV (0.51 +/- 0.22). In conclusion, the final irrigation protocols evaluated in this study using the Luer syringe presented similar performance in the removal of debris from the apical third of flattened root canals.
Department of Endodontics, University of Ribeirão Preto, SP, Brazil.
Michele Regina
MR
Nadalin
Danyel Elias da Cruz
DE
Perez
Luiz Pascoal
LP
Vansan
Cristina
C
Paschoala
Manoel Damião
MD
Souza-Neto
Paulo César
PC
Saquy
D003786:Dental Pulp Cavity / Q000033:anatomy & histology / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007180:Incisor; D008334:Mandible; D012388:Root Canal Irrigants / Q000008:administration & dosage*; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D016369:Smear Layer; D012973:Sodium Hypochlorite / Q000008:administration & dosage*; D013594:Syringes; D013997:Time Factors; D019227:Tooth Apex / Q000033:anatomy & histology
D012388:Root Canal Irrigants; D012973:Sodium Hypochlorite