华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

不同冲洗剂对桩腔预备后牙本质清洗能力及树脂突的影响

茅彩云 顾新华   

  1. 浙江大学医学院附属第一医院口腔医疗中心, 浙江杭州310003
  • 收稿日期:2010-06-25 修回日期:2010-06-25 出版日期:2010-06-20 发布日期:2010-06-20
  • 通讯作者: 顾新华,Tel: 0571-87236338
  • 作者简介:茅彩云(1982—),女,浙江人,住院医师,硕士

Effect of different irrigants on radicular dentin cleansing and resin tag formation after post space preparation

MAO Cai -yun, GU Xin -hua   

  1. Dept. of Stomatology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
  • Received:2010-06-25 Revised:2010-06-25 Online:2010-06-20 Published:2010-06-20
  • Contact: GU Xin -hua,Tel: 0571-87236338

摘要:

目的比较不同根管冲洗剂对桩腔预备后根管内牙本质表面玷污层去除和牙本质小管开放的影响。方法将30个完成根管充填的上颌前牙经桩腔预备后,根据根管冲洗剂不同随机分成A、B、C 3组。A、B、C组分别使用3%过氧化氢(H2O2)、15%乙二胺四乙酸(EDTA)、15%EDTA加3%次氯酸钠(NaClO)作为冲洗剂。冲洗后每组选取8个标本通过扫描电镜(SEM)观察牙本质表面玷污层和牙本质小管开放情况,另选2个标本在粘接纤维桩后用于观察树脂突。结果A、B、C组牙本质清洁效果(Berg值)分别为3.89±0.36、1.77±0.30、1.25±0.21;牙本质小管直径分别为(2.53±0.19)、(3.11±0.23)、(3.83±0.52)μm。3组间牙本质表面清洁效果和牙本质小管开口差异均有统计学意义(P<0.05)。C组出现明显的牙本质过蚀。各组间的树脂突形成有很大差异,以B组最优。结论桩腔预备后用15%EDTA冲洗桩腔能有效去除玷污层,使牙本质小管开放,利于树脂黏固剂有效渗入牙本质小管和胶原纤维网。

关键词: 根管冲洗剂, 桩腔预备, 玷污层, 纤维桩, 树脂突

Abstract:

Objective To evaluate the effect of different root canal irrigants on smear layer removal and dentinal tubule opening of root canal surfaces after post space preparation. Methods Thirty maxillary anteriors were endodontically treated. After post space preparation, the teeth were assigned to three groups with ten teeth each: group A, B, C. 3% H2O2, 15% ethylenediamine tetraacetic acid(EDTA), 15% EDTA and 3% NaClO were used as irrigant of group A, B, C. After post space irrigation, eight teeth of each group were examined under scanning electron microscope (SEM) for smear layer removal and dentinal tubule opening. The left two specimens were restored with fiber posts and prepared for evaluation of resin tag formation. Results The cleansing effectiveness of group A, B and C was respectively 3.89±0.36, 1.77±0.30, 1.25±0.21. The dentinal tubule opening of group A, B and C was respectively (2.53± 0.19), (3.11±0.23), (3.83±0.52)μm. The cleansing effectiveness and dentinal tubule opening of root canal surfaces were significantly affected by different root canal irrigants(P<0.05). Excessive erosion of the dentin was observed in group C. Resin tag formation differed between the three irrigant groups, and group B showed excellent resin tag formation. Conclusion Irrigation with 15% EDTA after post space preparation can excellently remove the smear layer and improve dentinal tubule opening, permitting well penetration of resin adhesive into the dentinal tubules and collagen fibrillar structure.

Key words: root canal irrigants, post space preparation, smear layer, fiber post, resin tag