Effect of endodontic irrigants on the interface between bulk-fill resin and dentin using a universal adhesive system

Author(s)

Érika Mayumi Omoto

• Document type: Master's Dissertation
• Press: Araçatuba. 2023-08-07.
• Institution: Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba
• Defense date: 2023-08-04
• Advisor: Ticiane Cestari Fagundes

Abstract

It is recommended that the post endodontic restoration should be done immediately after the root canals obturation ; however, some irrigants can affect the adhesion of restorative materials. Therefore, the aim of this study was to evaluate the effect of endodontic irrigants on adhesion and interfacial sealing between bulk fill resin s and dentin using a universal adhesive system. The pulp chamber of 96 human molars was accessed and the specimens were divided into 6 groups according to the endodontic irrigant s (chlorhexidine 2% C and sodium hypochlorite 5.25% H) and restorative system s (conventional adhesive system + conventional composite resin Z; universal adhesive system + bulk fill composite resin O; universal adhesive system + bulk fill composite r esin T). Six rectangular sticks (1.0±0.1 mm 2 ) were obtained from each specimen. After 24 hours, half of the sticks were subjected to microtensile and nanoleakage tests, the other half w as subjected to thermocycling before analysis . Nanoleakage scores wer e assessed by two blind ed examiners : 0 (no nanoleakage), I (<25 %), II (25% to 49%), III (50% to 75%), IV (>75%). Data from microtensile were analyzed using Kruskal Wallis (comparison s between restorative systems), Mann Whitney (comparison s between irrigants) and Wilcoxon (comparison s between times). Kappa test was use d to assess the inter examiners agreement for the nanoleakage data . All tests were performed with a significance level of 5%. N anoleakage scores were presented in illustrative graphic and images Regarding microtensile results, irrigant C provided greater bond strength than H in the initial time for T and Z; the opposite occurred for O after thermocycling (p <0.05). Comparing the restorative systems, T presented the highest bond strength values, being superior to O and similar to Z using irrigant C at the i nitial time (p <0.05); there was no difference between restorative systems with irriga n t H (p >0.05). After thermocycling, there was similarity between restorative systems for both irrigating solutions (p >0.05). There was reduction in adhesion after therm ocycling for all restorative systems when the irrigant used was C (p < T he Kappa result was 0.85 for nanoleakage . CT presented lower nanoleakage than HT, and CO presented greater nanoleakage than CT and CZ at the initial time . T here was an increase i n nanoleakage after thermocycling for all groups . It was concluded that irrigation performed with 2% chlorhexidine can benefit initial dentin adhesion, being restorative system dependent, however, the adhesive performance was not maintained after aging. Na after aging. Nanoleakage occurred in all restorative systems, and its percentage increased after noleakage occurred in all restorative systems, and its percentage increased after the aging of the restoration.the aging of the restoration. (AU)

• FAPESP's process: 21/05476-0 - Effect of endodontic irrigants on bulk-fill resin-dentin interface with universal adhesive system
• Grantee: Érika Mayumi Omoto
• Support Opportunities: Scholarships in Brazil - Master