ABSTRACT
The aim of this study was to compare the apically extruded debris associated with ProTaper Next and OneShape Apical files using two different irrigation needles, open-ended and closed-ended (Max-I-Probe). Forty-eight mandibular premolars were assigned to four groups (n=12) as follows: Group PTN-SN: Root canal was prepared with ProTaper Next (PTN) and irrigated with open-ended standard needle; Group PTN-MP: Root canal was prepared with PTN and irrigated with Max-I-Probe; Group OSA-SN: Root canal was prepared with OneShape Apical (OSA) and irrigated with open-ended needle; Group OSA-MP: Root canal was prepared with OSA and irrigated with Max-I-Probe. Debris extruded during instrumentation was collected into pre-weighed Eppendorf tubes. After storage in an incubator at 70 °C for 5 days, the Eppendorf tubes were weighed to obtain the final weight with extruded debris. The difference between pre-and post-debris weights was calculated and statistical analysis was performed using Kruskal-Wallis and Mann-Whitney U tests (p<0.05). No statistically significant difference was observed between files and needles regarding amount of apically extruded debris (p>0.05). OneShape Apical and ProTaper Next resulted in extrusion of debris beyond the apical foramen, regardless of needle tip.
.O objetivo do presente estudo foi comparar a extrusão apical de restos de preparação de canais, associada às brocas ProTaper Next e OneShape Apical usando duas agulhas de irrigação, de ponta aberta e ponta fechada (Max-I-Probe). Quarenta e oito premolares inferiores foram divididos em quatro grupos (n=12): Grupo PTN-SN: o canal radicular foi preparado com ProTaper Next (PTN) e irrigado com agulha convencional de ponta aberta; Grupo PTN-MP: o canal radicular foi preparado com PTN e irrigado com Max-I-Probe; Grupo OSA-SN: o canal radicular foi preparado com OneShape Apical (OSA) e irrigado com agulha de ponta aberta; Grupo OSA-MP: o canal radicular foi preparado com OSA e irrigado com Max-I-Probe. Os restos extrudados apicalmente foram coletados em tubos Eppendorf previamente pesados. Após armazenagem por cinco dias a 70 °C, os tubos Eppendorf foram pesados para obter o peso final com os resíduos. A diferença entre as pesagens antes e depois foi calculada e análise estatística foi feita usando os testes de Kruskal-Wallis e Mann-Whitney U (p<0,05). Não houve diferença estatisticamente significante entre as brocas e agulhas com relação à quantidade de resíduos extrudados (p>0,05). As brocas ProTaper Next e OneShape Apical promoveram extrusão além do forame apical, independente do tipo de agulha utilizada.
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