Cidade Fernanda Helaine, Schmidt Tamer Ferreira, Dos Santos Luciane Geanini Pena, Tay Franklin R, da Silveira Teixeira Cleonice, Felippe Mara Cristina Santos, Bortoluzzi Eduardo Antunes
Postgraduate Program of the Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
Department of Endodontics, College of Dental Medicine, Georgia Regents University, Augusta, GA, USA.
Clin Oral Investig. 2016 Mar;20(2):247-52. doi: 10.1007/s00784-015-1500-x. Epub 2015 Jun 4.
This study investigated the effect of passive ultrasonic irrigation (PUI) on diffusion of hydroxyl ions through radicular dentine.
After chemomechanical preparation of root canals in 60 human teeth, the cementoenamel junction and the apical 3 mm of each root were covered with fast-setting adhesive. Four final irrigation protocols were applied (n = 10): group (G)1: irrigation with EDTA + NaOCl; G2: EDTA + PUI + NaOCl; G3: EDTA+(NaOCl + PUI); G4: (EDTA + PUI) + (NaOCl + PUI). Ten teeth irrigated with distilled water followed by PUI (G5) served as the negative control. After drying, the canals were filled with calcium hydroxide paste (CH), sealed and kept in individual vials containing 10 mL of distilled water with known pH values. At 7, 14, and 21 days, the pH of the water in the vials was measured. The pH values in various groups were analyzed with two-way ANOVA (irrigation protocol and time period as factors) and Holm-Sidak multiple comparison test (α = 0.05).
Changes in pH was not significantly different among groups (P = 0.651) but was significant different among different time periods (P < 0.0001). For all groups, ion diffusion was higher at 14 and 21 days than at 7 days.
PUI has no effect on diffusion of hydroxyl ions through radicular dentine. When CH is used as temporary filling material, a waiting period of at least 14 days is required to create an alkaline environment within the radicular dentine.
The use of PUI during final irrigation phase does not improve the action of CH when it is used as temporary filling material.
本研究调查了被动超声冲洗（PUI）对氢氧根离子通过根管牙本质扩散的影响。
在60颗人牙的根管进行化学机械预备后，用快速固化粘合剂覆盖每个牙根的牙骨质釉质界和根尖3毫米。应用四种最终冲洗方案（n = 10）：第1组（G1）：用乙二胺四乙酸（EDTA）+次氯酸钠（NaOCl）冲洗；G2：EDTA + PUI + NaOCl；G3：EDTA+(NaOCl + PUI)；G4：(EDTA + PUI)+(NaOCl + PUI)。用蒸馏水冲洗后再进行PUI冲洗的10颗牙（G5）作为阴性对照。干燥后，根管内充满氢氧化钙糊剂（CH），密封并保存在含有10毫升已知pH值蒸馏水的单独小瓶中。在第7、14和21天，测量小瓶中水的pH值。用双向方差分析（冲洗方案和时间段作为因素）和Holm-Sidak多重比较检验（α = 0.05）分析各实验组的pH值。
各实验组之间pH值变化无显著差异（P = 0.651），但在不同时间段有显著差异（P < 0.0001）。对于所有实验组，离子扩散在第14天和第21天高于第7天。
PUI对氢氧根离子通过根管牙本质的扩散没有影响。当使用CH作为临时充填材料时，需要至少14天的等待期才能在根管牙本质内形成碱性环境。
在最终冲洗阶段使用PUI并不能改善CH作为临时充填材料时的作用。
