Evaluation of microshear bond strength and nanoleakage of etch-and-rinse and self-etch adhesives to dentin pretreated with silver diamine fluoride/potassium iodide: An in vitro study

• Published in: Indian journal of dental research Vol. 27; no. 4; pp. 421 - 425
• Main Authors: Selvaraj, Karthik, Sampath, Vidhya, Sujatha, V, Mahalaxmi, S
• Format: Journal Article
• Language: English
• Published: India Wolters Kluwer India Pvt. Ltd 01.07.2016; Medknow Publications and Media Pvt. Ltd; Medknow Publications & Media Pvt. Ltd; Wolters Kluwer Medknow Publications
• Subjects: Acid Etching, Dental; Adhesives; Adhesives and sealants industry; Analysis; Dental Bonding - methods; Dental Etching; Dental Leakage - prevention & control; Dental Materials - chemistry; Dental Stress Analysis; Dentin - ultrastructure; Dentin-Bonding Agents - chemistry; Etch-and-rinse adhesives; Humans; In Vitro Techniques; Materials Testing; Microscopy, Electron; microshear bond strength; nanoleakage; potassium iodide; Potassium Iodide - chemistry; Quaternary Ammonium Compounds - chemistry; self-etch adhesives; Shear Strength; silver diamine fluoride; Surface Properties; transmission electron microscope; Transmission electron microscopes; Etch-and-rinse adhesives; microshear bond strength; self-etch adhesives; nanoleakage; potassium iodide; silver diamine fluoride; transmission electron microscope
• ISSN: 0970-9290; 1998-3603
• DOI: 10.4103/0970-9290.191893

Aims: The aim of this in vitro study was to comparatively evaluate the microshear bond strength (MSBS) of etch-and-rinse and self-etch (ER and SE) bonding systems to dentin pretreated with silver diamine fluoride/potassium iodide (SDF/KI) and nanoleakage at the resin-dentin interface using transmission electron microscope (TEM). Subjects and Methods: Seventy-two dentin slabs of 3 mm thickness were prepared from extracted human permanent third molars and divided into four groups (n = 18) based on the dentin surface treatment as follows: (1) ER adhesive bonding without dentin pretreatment; (2) SDF/KI pretreatment of dentin followed by ER adhesive bonding; (3) SE adhesive bonding without dentin pretreatment; and (4) SDF/KI pretreatment of dentin followed by SE adhesive bonding. Resin composite was built on the dentin slabs to a height of 4 mm incrementally, and dentin-composite beams of approximately 1 mm 2 cross-sectional area were prepared. The beams were subjected to MSBS analysis, and the fractured surface was observed under scanning electron microscope to determine the mode of failure. The resin-dentin interface was examined under TEM for evaluation of nanoleakage. Statistical Analysis Used: One-way ANOVA followed by Tukey′s post hoc multiple comparison tests. Results: Pretreatment of dentin with SDF/KI increased the MSBS of ER and SE adhesives, though not statistically significant, except between Groups 2 and 3. In all the groups, the predominant mode of failure was adhesive followed by cohesive in resin, mixed and cohesive in dentin. TEM examination of resin-dentin interface showed that pretreatment with 38% SDF/KI reduced nanoleakage regardless of the type of bonding system used. Conclusions: Pretreatment of dentin with SDF/KI minimized nanoleakage at the resin-dentin interface without adversely affecting the bond strength of resin composite to dentin.