Research Information System
FDI World Dental Congress 2025, Shanghai, China, 9 - 12 September 2025, (Unpublished)
Aim: The study aimed to evaluate the effect of different surface conditioning protocols on the bond strength of high-viscosity glass ionomer cement to primary dentin under various thermocycling conditions.
Materials and Methods: The study protocol was approved by the institutional ethics committee (Approval No.2024/05-34). A total of 108 extracted primary teeth meeting the inclusion criteria were used. Specimens were randomly assigned to four groups according to the number of thermocycles (control, 1000, 5000, 10,000). Each group was further divided into three subgroups based on the surface conditioning protocol: no conditioning, conditioning with the liquid of glass ionomer cement, and conditioning with polyacrylic acid. Bond strength was measured using a shear bond test. Data were analyzed using the Shapiro-Wilk test, robust ANOVA test, and Bonferroni test (p<0.05).
Results: It was observed that the bond strength significantly decreased statistically in thermal cycling processes, regardless of surface conditioning protocols (p<0.001). Surface conditioning protocols, independent of thermocycling, did not have a statistically significant effect on bond strength (p=0.941). No significant interaction effect was observed between thermocycling and surface conditioning on bond strength (p=0.617). There was no significant correlation between fracture types and the study groups (p=0.999).
Conclusion: Surface conditioning with polyacrylic acid did not improve the bond strength of high-viscosity glass ionomer cement to primary dentin, while thermocycling had a detrimental effect. These findings highlight the need for alternative conditioning strategies to enhance long-term performance.
Keywords: Glass ionomer, Shear bond strength, Primary tooth