Removal of the smear layer from flattened canals using different chemical substances.
This study used scanning electron microscopy to evaluate the flattened root canals of human mandibular incisors cleaned with nickel-titanium instruments and different chemical substances. Teeth were selected and divided randomly into five groups (n = 10) according to the chemical substances used in the biomechanical preparation: 5.25% sodium hypochlorite (Group 1), 5.25% sodium hypochlorite plus a final irrigation with 17% EDTAC (Group 2), EDTA gel combined with 5.25% sodium hypochlorite (Group 3), 2% chlorhexidine gel (Group 4), and 5.25% sodium hypochlorite combined with Glyde File Prep gel (Group 5). Data analysis showed a statistically significant difference (p < 0.001) among groups. Groups 1 and 5 were similar statistically (p > 0.001) and displayed a higher amount of smear layer on canal walls. Samples from Groups 2, 3, and 4 revealed root canal walls without smear layer and exposed dentin tubules. Among the associations tested in this study, 5.25% sodium hypochlorite solution combined with 17% EDTAC, 5.25% sodium hypochlorite combined with EDTA gel, and 2% chlorhexidine gel all were effective substances for removing the smear layer from flattened root canals.
Department of Endodontics, Federal University of Goias, Brazil.
Marcos
M
Arruda
Marcos Porto
MP
de Arruda
Jacy Ribeiro
JR
de Carvalho-Júnior
Francisco Jose
FJ
de Souza-Filho
Manoel Damiao
MD
Sousa-Neto
Gersinei Carlos
GC
de Freitas
D002710:Chlorhexidine / Q000627:therapeutic use; D003786:Dental Pulp Cavity / Q000187:drug effects* / Q000648:ultrastructure; D004492:Edetic Acid / Q000627:therapeutic use; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging / Q000187:drug effects / Q000648:ultrastructure; D011859:Radiography; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D016369:Smear Layer; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D013499:Surface Properties / Q000187:drug effects
D012388:Root Canal Irrigants; D004492:Edetic Acid; D012973:Sodium Hypochlorite; D002710:Chlorhexidine