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KMID : 1034420140390020104
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Restorative Dentistry & Endodontics
2014 Volume.39 No. 2 p.104 ~ p.108
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Effect of passive ultrasonic agitation during final irrigation on cleaning capacity of hybrid instrumentation
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Vinhorte Marcilene Coelho
Suzuki Eduardo Hideki
de Carvalho Maira Sousa
Marques Andre Augusto Franco
Junior Emilio Carlos Sponchiado
Garcia Lucas da Fonseca Roberti
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Abstract
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Objectives: To evaluate the effect of passive ultrasonic agitation on the cleaning capacity of a hybrid instrumentation technique.
Materials and Methods: Twenty mandibular incisors with mesiodistal-flattened root shape had their crowns sectioned at 1 mm from the cementoenamel junction. Instrumentation was initiated by catheterization with K-type files (Denstply Maillefer) #10, #15, and #20 at 3 mm from the working length. Cervical preparation was performed with Largo bur #1 (Dentsply Maillefer) followed by apical instrumentation with K-type files #15, #20 and #25, and finishing with ProTaper F2 file (Denstply Maillefer). All files were used up to the working length under irrigation with 1 mL of 2.5% sodium hypochlorite (Biodynamica) at each instrument change. At the end of instrumentation, the roots were randomly separated into 2 groups (n = 10). All specimens received final irrigation with 1 mL of 2.5% sodium hypochlorite. The solution remained in the root canals in Group 1 for one minute; and ultrasonic agitation was performed in Group 2 for one minute using a straight tip inserted at 1 mm from working length. The specimens were processed histologically and the sections were analyzed under optic microscope (×64) to quantify debris present in the root canal.
Results: The samples submitted to ultrasonic agitation (Group 2) presented significant decrease in the amount of debris in comparison with those of Group 1 (p < 0.05).
Conclusions: The hybrid instrumentation technique associated with passive ultrasonic agitation promoted greater debris removal in the apical third of the root canals.
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KEYWORD
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Ni-Ti, ProTaper, Sodium hypoclorite, Ultrasonic
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