Cachovan Georg, Schiffner Ulrich, Altenhof Saskia, Guentsch Arndt, Pfister Wolfgang, Eick Sigrun
Department of Restorative and Preventive Dentistry, Center for Dental and Oral Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
J Endod. 2013 Sep;39(9):1171-5. doi: 10.1016/j.joen.2013.06.008.
To ensure root canal treatment success, endodontic microbiota should be efficiently reduced. The in vitro bactericidal effects of a hydrodynamic system and a passive ultrasonic irrigation system were compared.
Single-rooted extracted teeth (n = 250) were contaminated with suspensions of Enterococcus faecalis ATCC 29212, mixed aerobic cultures, or mixed anaerobic cultures. First, the antibacterial effects of the hydrodynamic system (RinsEndo), a passive ultrasonic irrigation system (Piezo smart), and manual rinsing with 0.9% NaCl (the control) were compared. Colony-forming units were counted. Second, the 2 systems were used with 1.5% sodium hypochlorite (NaOCl) alone or NaOCl + 0.2% chlorhexidine (CHX). The colony-forming units in the treated and untreated roots were determined during a period of 5 days.
Both irrigation systems reduced bacterial numbers more effectively than manual rinsing (P < .001). With NaCl, ultrasonic activated irrigation reduced bacterial counts significantly better than hydrodynamic irrigation (P = .042). The NaOCl + CHX combination was more effective than NaOCl alone for both systems (P < .001), but hydrodynamic irrigation was more effective with NaOCl + CHX than the passive ultrasonic irrigation system.
Both irrigation systems, when combined with NaOCl + CHX, removed bacteria from root canals.
为确保根管治疗成功，应有效减少牙髓微生物群。比较了水力系统和被动超声冲洗系统的体外杀菌效果。
将单根离体牙（n = 250）用粪肠球菌ATCC 29212悬液、混合需氧培养物或混合厌氧培养物污染。首先，比较了水力系统（RinsEndo）、被动超声冲洗系统（Piezo smart）和用0.9%氯化钠手动冲洗（对照）的抗菌效果。计算菌落形成单位。其次，将这两种系统与单独的1.5%次氯酸钠（NaOCl）或NaOCl + 0.2%氯己定（CHX）一起使用。在5天的时间内测定处理过和未处理过的根管中的菌落形成单位。
两种冲洗系统比手动冲洗更有效地减少了细菌数量（P <.001）。使用氯化钠时，超声激活冲洗比水力冲洗显著更好地减少了细菌数量（P =.042）。对于两种系统，NaOCl + CHX组合比单独使用NaOCl更有效（P <.001），但在使用NaOCl + CHX时，水力冲洗比被动超声冲洗系统更有效。
两种冲洗系统与NaOCl + CHX联合使用时，均能从根管中清除细菌。
