The Effect of Disinfection with Chlorhexidine on the Shear Bond Strength of Equia Resin-Modified Glass Ionomer Cement to Dentin in Permanent Teeth after Two Thermocycling Protocols

[摘要] Statement of the Problem:There are some concerns regarding the effect of chlorhexidine (CHX) applied for cavity disinfection on the bond strength of adhesive restorations to dentin. Purpose:This study sought to assess the effect of CHX on the shear bond strength (SBS) of Equia resin-modified glass ionomer cement (RMGIC) to dentin in permanent teeth. Materials and Method:In this experimental study, the buccal surface of 84 freshly extracted human premolars was ground to expose the flat dentin. The samples were randomly assigned to four groups (n=21). The steps were as following in the group I a : conditioning, Equia RMGIC, 500 thermal cycles; group I b : conditioning, Equia RMGIC, 6000 thermal cycles; group II a : conditioning, CHX, Equia RMGIC, 500 thermal cycles, and group II b : conditioning, CHX, Equia RMGIC, and 6000 thermal cycles. Twenty samples from each group were subjected to SBS test and one sample was inspected under a scanning electron microscope. Data were analyzed using two-way ANOVA and t-test. Results:The SBS was significantly different among the groups ( p = 0.007). The groups subjected to 500 thermal cycles showed significantly higher SBS to dentin when they were treated with CHX ( p = 0.000). There was no significant difference between samples thermocycled for 6000 cycles with and without application of CHX ( p = 0.269). The SBS in the groups that were thermocycled for 6000 cycles (I band II b ) was lower than those thermocycled for 500 cycles (I aand II a ). This difference between II aand II bwas statistically significant ( p = 0.007). Conclusion:Chlorhexidine can positively affect the short term SBS of Equia RMGIC to dentin.

[学科分类] 口腔科学