Huang Yan, Celikten Berkan, de Faria Vasconcelos Karla, Ferreira Pinheiro Nicolielo Laura, Lippiatt Nicholas, Buyuksungur Arda, Jacobs Reinhilde, Orhan Kaan
1 Oral and Maxillo-facial Surgery - Imaging and Pathology (OMFS-IMPATH), KU LEUVEN, Leuven, Belgium.
2 State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China.
Dentomaxillofac Radiol. 2017 Dec;46(8):20170223. doi: 10.1259/dmfr.20170223. Epub 2017 Nov 16.
To investigate voids in different root canal sealers using micro-CT and nano-CT, and to explore the feasibility of using nano-CT for quantitative analysis of sealer filling quality.
30 extracted mandibular central incisors were randomly assigned into three groups according to the applied root canal sealers (Total BC Sealer, Sure Seal Root, AH Plus) by the single cone technique. Subsequently, micro-CT and nano-CT were performed to analyse the incidence rate of voids, void fraction, void volume and their distribution in each sample.
Micro-CT evaluation showed no significant difference among sealers for the incidence rate of voids or void fraction in the whole filling materials (p > 0.05), whereas a significant difference was found between AH Plus and the other two sealers using nano-CT (p < 0.05). All three sealers presented less void volume in the apical third; however, higher void volumes were observed in the apical and coronal thirds in AH Plus using micro-CT (p < 0.05), while nano-CT results displayed higher void volume in AH Plus among all the sealers and regions (p < 0.05).
Bioactive sealers showed higher root filling rate, lower incidence rate of voids, void fraction and void volume than AH Plus under nano-CT analysis, when round root canals were treated by the single cone technique. The disparate results suggest that the higher resolution of nano-CT have a greater ability of distinguishing internal porosity, and therefore suggesting the potential use of nano-CT in quantitative analysis of filling quality of sealers.
使用显微CT和纳米CT研究不同根管封闭剂中的空隙，并探讨使用纳米CT对封闭剂充填质量进行定量分析的可行性。
30颗拔除的下颌中切牙根据所应用的根管封闭剂（Total BC封闭剂、Sure Seal Root、AH Plus）采用单尖法随机分为三组。随后，进行显微CT和纳米CT分析每个样本中的空隙发生率、空隙率、空隙体积及其分布。
显微CT评估显示，在整个充填材料中，封闭剂之间的空隙发生率或空隙率无显著差异（p>0.05），而使用纳米CT时，AH Plus与其他两种封闭剂之间存在显著差异（p<0.05）。所有三种封闭剂在根尖三分之一处的空隙体积均较小；然而，使用显微CT时，AH Plus在根尖和冠方三分之一处观察到较高的空隙体积（p<0.05），而纳米CT结果显示，在所有封闭剂和区域中，AH Plus的空隙体积最高（p<0.05）。
在纳米CT分析下，当采用单尖法治疗圆形根管时，生物活性封闭剂显示出比AH Plus更高的根管充填率、更低的空隙发生率、空隙率和空隙体积。不同的结果表明，纳米CT的高分辨率具有更强的区分内部孔隙率的能力，因此表明纳米CT在封闭剂充填质量定量分析中的潜在应用。
