State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, P.R. China.
Photobiomodul Photomed Laser Surg. 2021 May;39(5):349-354. doi: 10.1089/photob.2019.4798. Epub 2020 Dec 9.
This study aimed to compare the efficacy of conventional needle irrigation (CI), ultrasonically activated irrigation (UAI), photon-induced photoacoustic streaming (PIPS), and shock wave-enhanced emission photoacoustic streaming (SWEEPS) in removing calcium hydroxide [Ca(OH)] from root canals of mandibular molars using microcomputed tomography. Various adjunctive irrigation strategies have been recommended to improve the removal of Ca(OH). No reports have evaluated the SWEEPS laser-activated method for the removal of Ca(OH) from root canals of mandibular molars. Forty mandibular molars were instrumented and filled with Ca(OH). Four irrigation groups (CI, UAI, PIPS, and SWEEPS) were established. The volume of root canals and Ca(OH) and the Ca(OH) volume reduction percentage (%Rd) were calculated. Data were analyzed by one-way analysis of variance and Kruskal-Wallis analysis of variance. The residual Ca(OH) in the apical third was higher than that in the cervical and middle thirds in all groups ( < 0.05). Comparison of the %Rd of Ca(OH) in mesial canals revealed that PIPS and SWEEPS removed more Ca(OH) than CI and UAI in the cervical third ( < 0.05). The middle third of the mesial canals and the cervical and middle thirds of the distal canals did not show significant differences among groups ( > 0.05). Significant differences in the %Rd of Ca(OH) were noted between CI and other groups in the apical third of mesial and distal canals ( < 0.05). No group demonstrated complete removal of Ca(OH). UAI and laser-activated irrigation significantly improved Ca(OH) removal in the apical third of mesial and distal canals. No agitation technique could completely remove Ca(OH).
本研究旨在通过微计算机断层扫描比较传统的针式冲洗（CI）、超声激活冲洗（UAI）、光声空化流（PIPS）和冲击波增强发射光声流（SWEEPS）在去除下颌磨牙根管内氢氧化钙（Ca(OH)）的效果。为了提高 Ca(OH) 的去除效果，推荐了各种辅助冲洗策略。尚未有报道评估 SWEEPS 激光激活方法在去除下颌磨牙根管内 Ca(OH)的效果。将 40 颗下颌磨牙进行器械处理和 Ca(OH)填充，设立了 4 个冲洗组（CI、UAI、PIPS 和 SWEEPS）。计算根管体积和 Ca(OH)以及 Ca(OH)体积减少百分比（%Rd）。采用单因素方差分析和 Kruskal-Wallis 方差分析对数据进行分析。在所有组中，根尖三分之一的残余 Ca(OH)均高于颈中和中三分之一（ < 0.05）。比较近中根管的 Ca(OH) %Rd，发现 PIPS 和 SWEEPS 在颈三分之一处比 CI 和 UAI 去除更多的 Ca(OH)（ < 0.05）。近中根管的中三分之一和远中根管的颈中和中三分之一组间无显著差异（ > 0.05）。在近中和远中根管的根尖三分之一，CI 与其他组之间的 Ca(OH) %Rd 存在显著差异（ < 0.05）。没有一个组能够完全去除 Ca(OH)。UAI 和激光激活冲洗显著提高了近中和远中根管根尖三分之一处的 Ca(OH)去除效果。没有任何搅拌技术可以完全去除 Ca(OH)。
