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Influence of sodium hypochlorite irrigants on the bonding of fiber posts to root canals: a Meta‐analysis

BACKGROUND: Currently, whether the use of sodium hypochlorite (NaOCl) influences the bond strength of fiber posts is still uncertain. OBJECTIVE: To evaluate the influence of NaOCl on the bond strength of fiber posts by Meta‐analysis. METHODS: Randomized controlled trials about the impact of NaOCl irrigation to the bond strength of fiber posts were retrieved from PubMed, EMbase, Web Of Science, OVID, CBM, ClinicalKey, CNKI, CqVip and WanFang databases, and other databases through manual retrieval as well. The deadline of the collection was December 31, 2016, with no limit of regions and languages. A Meta‐analysis was performed with the bond strength of fiber posts as an indicator. RESULTS: A total of 11 randomized controlled trials were included. In the experimental group (NaOCl group), the root canal was rinsed with NaOCl, and dried followed by fiber post bonding using the total‐etching system, the self‐etching system and the self‐adhesive system. In the control group, the root canal was washed with pure water or normal saline. Meta‐analysis showed that weighted mean difference (WMD) (NaOCl group/control group)=‐0.90, 95% confidence interval (CI) (‐1.50, ‐0.31), Z=2.97, P=0.003. Subgroup analysis showed that WMD (total‐etching: NaOCl group/control group)=‐2.38, 95% CI (‐4.86, 0.10), Z=1.88, P=0.06; WMD (self‐etching: NaOCl group/control group)=‐1.22, 95% CI (‐2.17, ‐0.28), Z=2.55, P=0.01; WMD (self‐adhesive: NaOCl group/control group)=‐1.97, 95% CI (‐2.30, ‐1.64), Z=11.73, P < 0.000 01. As the limited number of enrolled samples in the total‐etching group and self‐etching group results in a higher heterogeneity, further investigations are warranted. The present data suggests that irrigating the surface of root canals with NaOCl alone has negative impact on the bond strength of fiber posts using the self‐adhesive system.