Influence of chlorhexidine 2% and sodium hypochlorite 5.25% on micro-tensile bond strength of universal adhesive system (G-Premio Bond)

Abstract

Aim: One of the reasons for the failure of adhesion in composite restorations and secondary caries may be the chemical irrigants used during the endodontic treatment. NaOCl is widely used for the biomechanical preparation of root canals due to its antimicrobial properties and capacity to dissolve organic material. In addition, another very effective decontamination solution is chlorhexidine 2%. There are few studies about the effect of root canal irrigation solutions on bond strength of universal adhesives therefore, in this study we have investigated the influence of CHX 2% and NaOCl 5.25% on micro-tensile bond strength of G-Premio Bond. Methods: Twenty-four human teeth were randomly allocated to the following groups: G1, immersion in saline solution 0.9% for 30 minutes (control); G2, immersion in CHX 2% for 30 minutes; G3, immersion in NaOCl 5.25% for 30 minutes. After restoration, the dentin/resin interface was tested by micro-tensile bond strength. The surfaces morphology was analyzed by Scanning Electron Microscopy. Data were analyzed by ANOVA followed by Tukey test in SPSS software Version 24. Results: There was a statistically significant difference between G3 and G1 (P < 0.05). There were no statistically significant differences among G1 and G2, G2 and G3. Conclusion: Root canal irrigation with NaOCl 5.25% significantly reduced the micro-tensile bond strength in the G-Premio Bond at self-etch mode, but the use of CHX did not make a significant difference.

Soluções Irrigadoras em Endodontia: evidências e deficiências

“…Ao pensar no uso do hipoclorito, a biossegurança torna-se mais indispensável ainda, de maneira que o dentista e o paciente devem proteger os seus olhos e roupas contra o irrigante, um bom isolamento absoluto deve ser executado para evitar qualquer fuga ou contato da solução para os tecidos moles, assim como o dentista deve manusear a solução com controle e precaução e ter um bom sugador para evitar extrusões periapicais. Divergentemente, Fazelian et al (2022), explicitaram as ações que as 2 principais soluções irrigadoras químicas utilizadas no tratamento de canal podem exercer na adesividade de restaurações com resinas compostas. Para tal entendimento, foram utilizados 24 dentes humanos extraídos que foram distribuídos aleatoriamente em 3 grupos, sendo G1-imersão em solução salina 0,9% por 30 minutos -grupo controle, G2 -imersão em CHX 2% por 30 minutos e G3 -imersão em NaOCl 5,25% por 30 minutos, em que foi investigada a resistência de união à microtração do G-Premio Bond.…”

The Effect of Different Sealer Removal Protocols on Micro-Tensile Bond Strength of Single Bond Plus to Dentin Exposed with Different Chemical Root Canal Irrigants: An Ex Vivo Study

“…The results of the CHX effect on the bond strength of adhesive resins to dentin are contradictory (10,21,22). Some studies have claimed that CHX has no effect on the interactions of resin systems with dentin due to its non-oxidizing nature (23,24). Chlorhexidine was used for a short time and at a high concentration (2% versus 0.12%), and self-etch adhesive systems were applied in these studies (22).…”