Aktemur Türker Sevinç, Uzunoğlu Emel, Purali Nuhan
Department of Endodontics, Faculty of Dentistry, Bülent Ecevit University, Zonguldak, Turkey.
Department of Endodontics, Faculty of Dentistry, Hacettepe University, Sihhiye, Ankara, Turkey.
J Dent Res Dent Clin Dent Prospects. 2018 Fall;12(4):294-298. doi: 10.15171/joddd.2018.046. Epub 2018 Dec 19.
This study compared the effect of smear layer on the penetration depth and push-out bond strength of various root canal sealers. A total of 90 extracted human mandibular premolars were assigned into 2 groups: smear layer preserved and smear layer removed. Then the roots were further divided into 3 subgroups according to the sealer tested: AH 26, BioRoot RCS and MTA Plus. Obturation was performed with gutta-percha and the relevant sealer was mixed with 0.1% rhodamine B. Three 1-mm-thick slices were obtained from the mid-third area of each root. Two slices were selected for the push-out test and the remaining slice was used to calculate the dentinal tubule penetration depth and percentage. The retention of MTA Plus and BioRoot RCS was higher than that of AH 26 when the smear layer was preserved (P<0.05). BioRoot RCS showed the lowest penetration depth when the smear layer was removed (P<0.05). Dentinal tubule penetration of root canal sealers had a limited effect on their adhesion to root canal wall.
本研究比较了玷污层对各种根管封闭剂渗透深度和推出粘结强度的影响。总共90颗拔除的人下颌前磨牙被分为2组：保留玷污层组和去除玷污层组。然后根据所测试的封闭剂将牙根进一步分为3个亚组：AH 26、BioRoot RCS和MTA Plus。用牙胶进行根管充填，并将相关封闭剂与0.1%的罗丹明B混合。从每个牙根的中三分之一区域获取三个1毫米厚的切片。选择两个切片进行推出试验，其余切片用于计算牙本质小管渗透深度和百分比。当保留玷污层时，MTA Plus和BioRoot RCS的固位力高于AH 26（P<0.05）。当去除玷污层时，BioRoot RCS显示出最低的渗透深度（P<0.05）。根管封闭剂的牙本质小管渗透对其与根管壁的粘结影响有限。
