Albuquerque Patrícia Pereira, Hungaro Duarte Marco Antonio, Pelegrine Rina Andréa, Kato Augusto Shoji, Stringheta Carolina Pessoa, Duque Jussaro Alves, Bueno Carlos Eduardo da Silveira
Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Campinas, Brazil.
Department of Restorative Dentistry, Endodontics and Dental Materials, School of Dentistry of Bauru, University of São Paulo, Bauru, Brazil.
Aust Endod J. 2020 Aug;46(2):210-216. doi: 10.1111/aej.12394. Epub 2020 Jan 26.
The aim of this study was to compare the root canal instrumentation techniques that involve foraminal enlargement versus those not involving it, in regard to the apical extrusion of filling material, using micro-computed tomography (micro-CT). Twenty-two premolars with single canals were instrumented using the ProTaper Universal System and then randomly divided into two groups (n = 11): Group NFE, without foraminal enlargement, and Group FE, with foraminal enlargement. Instrumentation was performed up to 1 mm short of the apical foramen, and foraminal patency was maintained at each instrument change in both groups. Prior to obturation, the apical portion of the specimens was wrapped in adhesive paper to ensure complete separation between apex and extruded material. The canals were filled according to the continuous wave of condensation technique. The apically extruded material was collected and measured using micro-CT. Extrusion in Group FE was significantly higher than in Group NFE (0.928 mm vs. 0.148 mm ; P < 0.001).
本研究的目的是使用微型计算机断层扫描（micro-CT），比较涉及根尖孔扩大的根管预备技术与不涉及根尖孔扩大的根管预备技术在充填材料根尖挤出方面的差异。使用ProTaper Universal系统对22颗单根管前磨牙进行预备，然后随机分为两组（n = 11）：非根尖孔扩大组（NFE组）和根尖孔扩大组（FE组）。预备至距根尖孔短1 mm处，两组在每次更换器械时均保持根尖孔通畅。在充填前，将标本的根尖部分用贴纸包裹，以确保根尖与挤出材料完全分离。按照连续波加压技术进行根管充填。使用micro-CT收集并测量根尖挤出的材料。FE组的挤出量显著高于NFE组（0.928 mm对0.148 mm；P < 0.001）。
