Assessment of sodium thiosulfate neutralizing effect on micro-hardness of dentin treated with sodium hypochlorite

BMC Oral Health

Fariborz Moazami¹  Mohammadhasan Naseri¹  Fereshteh Sobhnamayan¹  Safoora Sahebi¹ 

[1] Department of Endodontics, Dental School, Shiraz University of Medical Sciences, Ghasrdasht Street, 71956-15878, Shiraz, Iran;

关键词: Dentin;    Micro-hardness tests;    Sodium hypochlorite;    Sodium thiosulfate;   

DOI  :  10.1186/s12903-020-01320-2

来源: Springer

【 摘 要 】

BackgroundThis study aims to evaluate the ability of sodium thiosulfate (STS) to neutralize the adverse effect of sodium hypochlorite (NaOCl) on dentin micro-hardness.MethodsFifty single-rooted teeth were longitudinally sectioned. The samples divided into a control and four sample groups (n = 20). All the samples were immersed in different solutions as follows, Control: Normal saline for 15 min, G1and G2: 2.5% NaOCl for 15 min, G3: 2.5% NaOCl for 15 min, followed by 5% STS for 10 min, G4: Normal saline for 15 min followed by 5% STS for 10 min. All groups except G1 incubated for one week before the test. The micro-hardness of samples was measured. Data were analyzed using the Kruskal–Wallis test for pairwise comparisons. A p value < 0.05 was considered significant.ResultsAll groups showed a significant decrease in the micro-hardness value compared with the control group. NaOCl for one week (G2) reduced the micro-hardness of dentine compared with samples, tested immediately after immersion in NaOCl (G1) (p < 0.05). NaOCl alone (G2) or treated with STS (G3) resulted in a significant decrease in micro-hardness compared with the STS group (G4) (p < 0.05).ConclusionsSTS as a neutralizing agent could not prevent the dentin micro-hardness downturn caused by NaOCl.

【 授权许可】

CC BY