Vinhorte Marcilene Coelho, Suzuki Eduardo Hideki, de Carvalho Maíra Sousa, Marques André Augusto Franco, Sponchiado Júnior Emílio Carlos, Garcia Lucas da Fonseca Roberti
Department of Endodontics, School of Dentistry, Amazonas State University, Manaus, AM, Brazil.
Department of Endodontics, School of Dentistry, Federal University of Amazonas, Manaus, AM, Brazil.
Restor Dent Endod. 2014 May;39(2):104-8. doi: 10.5395/rde.2014.39.2.104. Epub 2014 Mar 21.
To evaluate the effect of passive ultrasonic agitation on the cleaning capacity of a hybrid instrumentation technique.
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 (Biodynâmica) 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.
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).
The hybrid instrumentation technique associated with passive ultrasonic agitation promoted greater debris removal in the apical third of the root canals.
评估被动超声冲洗对混合器械预备技术清洁能力的影响。
选取20颗近远中根面扁平的下颌切牙，在距牙骨质釉质界1mm处截冠。器械预备从用10号、15号和20号K型锉（登士柏迈尔牙科）在距工作长度3mm处进行根管疏通开始。先用1号Largo车针（登士柏迈尔牙科）进行颈部预备，然后用15号、20号和25号K型锉进行根尖预备，最后用ProTaper F2锉（登士柏迈尔牙科）完成预备。每次更换器械时，所有锉均在1mL 2.5%次氯酸钠（BioDinamica）冲洗下达到工作长度。预备结束时，将牙根随机分为2组（n = 10）。所有标本均用1mL 2.5%次氯酸钠进行最终冲洗。第1组根管内溶液保留1分钟；第2组使用直头超声探头在距工作长度1mm处进行1分钟的超声冲洗。标本进行组织学处理，切片在光学显微镜（×64）下分析，以量化根管内的碎屑。
与第1组相比，接受超声冲洗的样本（第2组）根管内碎屑量显著减少（p < 0.05）。
混合器械预备技术联合被动超声冲洗能更有效地清除根管根尖1/3处的碎屑。
