High-power diode laser in the disinfection in depth of the root canal dentin.
OBJECTIVE
The objective of this study was to evaluate the disinfection degree of dentine caused by the use of diode laser after biomechanical procedures.


METHODS
Thirty teeth were sectioned and roots were autoclaved and incubated for 4 weeks with a suspension of Enterococcus faecalis. The specimens were randomly divided into 3 groups (n = 10): G1, instrumented with rotary files, irrigated with 0.5% sodium hypochlorite and 17% EDTA-T, and then irradiated by 830-nm diode laser at 3 W; G2, the same procedures as G1 but without laser irradiation; and G3, irrigation with saline solution (control). Dentin samples of each third were collected with carbide burs and aliquots were sowed to count viable cells.


RESULTS
The disinfection degree achieved was 100% in G1 and 98.39% in G2, when compared to the control group (G3).


CONCLUSIONS
Diode laser irradiation provided increased disinfection of the deep radicular dentin in the parameters and samples tested.
de Souza
Eliana Barbosa
EB
Restorative Dentistry Department, Dentistry Faculty, University of São Paulo, São Paulo, Brazil. ebsouza@usp.br
Cai
Silvana
S
Simionato
Maria Regina Lorenzetti
MR
Lage-Marques
José Luiz
JL
D015169:Colony Count, Microbial; D003804:Dentin / Q000382:microbiology*; D004203:Disinfection / Q000295:instrumentation / Q000379:methods*; D004492:Edetic Acid; D013293:Enterococcus faecalis / Q000528:radiation effects*; D006801:Humans; D054023:Lasers, Semiconductor / Q000627:therapeutic use*; D012388:Root Canal Irrigants; D018915:Root Canal Preparation / Q000379:methods*; D012973:Sodium Hypochlorite
D012388:Root Canal Irrigants; D004492:Edetic Acid; D012973:Sodium Hypochlorite