Department of Conservative Dentistry, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea.
J Endod. 2010 Apr;36(4):732-6. doi: 10.1016/j.joen.2009.12.006. Epub 2010 Feb 6.
The purpose of this study was to evaluate the effect of different final irrigation regimens on the sealer penetration into dentinal tubules of curved root canals.
The mesiobuccal canals from 45 extracted maxillary and mandibular molars were instrumented with sodium hypochlorite (NaOCl) irrigation. The samples were divided into 3 groups according to the final irrigation used: group N (control), 3.5% NaOCl; group E, 17% ethylenediaminetetraacetic acid (EDTA); and group EN, 17% EDTA followed by 3.5% NaOCl. All teeth were obturated with gutta-percha and AH Plus sealer labeled with fluorescent dye. Transverse sections at 2 mm (apical) and 5 mm (coronal) from root apex were examined by using confocal laser scanning microscopy. Then, total percentage and maximum depth of sealer penetration were measured.
The apical sections in each group showed significantly lower percentage and maximum depth of sealer penetration than the coronal sections (P < .05). In apical levels, group E and EN resulted in a higher percentage of sealer penetration than the control group (P < .05), but there was no significant difference of maximum depth between group E and the control group (P > .05).
In curved canal, final rinse with NaOCl after the use of EDTA had no additional effect on sealer penetration. Complete debridement with a 1-minute application of EDTA remains a challenge in the apical area of curved canals.
本研究旨在评估不同终末冲洗方案对弯曲根管牙本质小管内封闭剂渗透的影响。
用次氯酸钠（NaOCl）冲洗液对 45 颗上颌和下颌磨牙的近中颊管进行器械处理。根据终末冲洗液的不同，将样本分为 3 组：组 N（对照组），3.5%NaOCl；组 E，17%乙二胺四乙酸（EDTA）；组 EN，17%EDTA 后用 3.5%NaOCl。所有牙齿均用牙胶和 AH Plus 封闭剂（标记有荧光染料）进行封闭。用共聚焦激光扫描显微镜检查根尖 2 毫米（根尖）和 5 毫米（牙冠）的横切片。然后，测量封闭剂渗透的总百分比和最大深度。
每组根尖切片的封闭剂渗透百分比和最大深度均显著低于牙冠切片（P<.05）。在根尖水平，组 E 和 EN 的封闭剂渗透百分比高于对照组（P<.05），但最大深度与对照组无显著差异（P>.05）。
在弯曲根管中，EDTA 后用 NaOCl 冲洗终末对封闭剂渗透没有额外的作用。在弯曲根管的根尖区域，用 1 分钟的 EDTA 进行彻底清创仍然是一个挑战。
