口腔医学研究

口腔医学研究 ›› 2017, Vol. 33 ›› Issue (4): 436-439.DOI: 10.13701/j.cnki.kqyxyj.2017.04.022

• 临床研究论著 • 上一篇    下一篇

iRoot SP牙本质小管渗透性的研究

吴於芝1, 林居红2*   

  1. 1. 遂宁市中心医院口腔科,口腔疾病与生物医学重庆市重点实验室 四川 遂宁 629000;
    2. 重庆医科大学附属口腔医院儿童口腔科,口腔疾病与生物医学重庆市重点实验室 重庆 401147
  • 收稿日期:2016-09-28 出版日期:2017-04-20 发布日期:2017-04-24
  • 通讯作者: 林居红,E-mail:653201577@qq.com
  • 作者简介:吴於芝(1987~ ),女,四川省遂宁市人,硕士,医师,主要从事口腔科临床研究工作。

Penetration of Dentinal Tubules by iRoot SP in Extracted Teeth in Vitro.

WU Yu-zhi1, LIN Ju-hong2*.   

  1. 1. Department of Dentistry, Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Center Hospital of Suining. Suining 629000, China;
    2. Department of Pediatrics, Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Affiliated Hospital of Stomatology, Chongqing Medical University. Chongqing 401147, China.
  • Received:2016-09-28 Online:2017-04-20 Published:2017-04-24

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摘要： 目的:通过扫描电镜评价iRoot SP牙本质小管渗透性。方法:单根管下颌前磨牙28颗截冠保留牙根14 mm,机扩备根管至F2,随机数字表法将标本分为实验组(A、B组,n=12)和对照组(n=4)。A组:iRoot SP+热牙胶充填;B组:AH Plus+热牙胶充填。实验组样本取冠、中、尖横截面,对照组样本取根管纵切面,SEM观察,实验组测量根管封闭剂在牙本质小管的渗透深度,对照组观察牙本质小管玷污层的去除程度。结果:实验组中,在根尖部AH Plus较iRoot SP牙本质小管渗透深度长,两者有显著差异(P＜0.05),在根管冠部、中部两者渗透深度相当,无统计学意义。对照组中,根管中上段牙本质小管口明显开放,玷污层基本去除,根尖段,有玷污层未完全去除。结论:iRoot SP与AH Plus相比,后者牙本质小管渗透性更强;两者在根管中上段渗透性高于根尖部;玷污层在一定程度上影响了根管封闭剂的渗透性。

Abstract: Objective: To evaluate the penetration depth of iRoot SP in the dentinal tubules by scanning electron microscopy (SEM). Methods: Twenty-eight mandibular premolars with single canal were decoronated to obtain 14-mm root segments. The root canals were instrumented using Protaper files prepared to F1. Roots were randomly divided into 2 experimental groups (A and B, n=12) and control group (n=4). Specimens of group A were filled with iRoot SP using the continuous wave of condensation technique. Specimens of group B were filled with AH Plus using the same technique. Specimens of group A and group B were transversely sectioned. The sealers penetration depth into the dentinal tubules was observed and measured in the coronal, middle and apical third of the root canal using SEM. Specimens of control group were longitudinally sectioned and the dentinal tubules were observed. Results: The penetration depth of AH Plus group was significantly higher than that of iRoot SP group in the apical third of the root canal walls (P<0.05). There was no significant difference in the coronal and middle third of the root canal walls between two groups. The smear layer was almost completely removed in the coronal and middle third of the root canal walls, however, partly removed in the apical third of the root canal walls. Conclusion: The dentinal tubule penetration of AH Plus is significantly greater than that of iRoot SP. The penetration depth of AH Plus and iRoot SP was better in the coronal and middle third than in the apical third of the root canal walls. The dentinal tubule penetration of sealers is affected by their physical and chemical properties and smear layer.

Key words: iRoot, SP, Permeability , Scanning electron microscopy

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