Hegde Vibha, Murkey Laxmi Suresh
Head, Department of Conservative and Endodontics, Yerela Medical College and Dental Hospital, Mumbai, Maharashtra, India.
Postgraduate Student, Department of Conservative and Endodontics, Yerela Medical Trust and Dental Hospital, Mumbai, Maharashtra, India.
J Clin Diagn Res. 2017 May;11(5):ZC75-ZC78. doi: 10.7860/JCDR/2017/27458.9923. Epub 2017 May 1.
The purpose of an endodontic obturation is to obtain a fluid tight hermetic seal of the entire root canal system. There has been an evolution of different materials and techniques to achieve this desired gap free fluid tight seal due to presence of anatomic complexity of the root canal system.
To compare the microgap occurring in root canals obturated with hydrophilic versus hydrophobic systems using scanning electron microscope.
Sixty extracted human single-rooted premolars were decoronated, instrumented using NiTi rotary instruments. The samples (n=20) were divided into three groups and obturated with Group A - (control group) gutta-percha with AH Plus, Group B - C-point with Smartpaste Bio and Group C - gutta-percha with guttaflow 2. The samples were split longitudinally into two halves and microgap was observed under scanning electron microscope in the apical 3 mm of the root canal.
Group A (control) showed a mean difference of 8.54 as compared to 5.76 in group C. Group B showed the lowest mean difference of 0.83 suggesting that the hydrophilic system (C-point/Smartpaste Bio) produced least microgap as compared to the hydrophobic groups.
Novel hydrophilic obturating system (C-points/ Smart-paste Bio) showed better seal and least microgap as compared to gutta-percha/guttaflow 2 and gutta-percha/ AH plus which showed gap at the sealer dentin interface due to less penetration and bonding of these hydrophobic obturating system.
根管充填的目的是实现整个根管系统的液密性密封。由于根管系统存在解剖复杂性，为实现这种理想的无间隙液密密封，出现了不同的材料和技术。
使用扫描电子显微镜比较用亲水性系统与疏水性系统充填的根管中出现的微间隙。
60颗拔除的人单根前磨牙去冠，使用镍钛旋转器械进行预备。样本（n = 20）分为三组，分别用A组（对照组）牙胶尖与AH Plus、B组C-point与Smartpaste Bio、C组牙胶尖与guttaflow 2进行充填。样本纵向劈成两半，在扫描电子显微镜下观察根管根尖3mm处的微间隙。
A组（对照组）的平均差值为8.54，而C组为5.76。B组的平均差值最低，为0.83，表明与疏水性组相比，亲水性系统（C-point/Smartpaste Bio）产生的微间隙最小。
新型亲水性充填系统（C-points/Smart-paste Bio）与牙胶尖/guttaflow 2和牙胶尖/AH plus相比，密封效果更好，微间隙最小，后两者由于这些疏水性充填系统的渗透和粘结较少，在封闭剂与牙本质界面处出现间隙。
