الفهرس 
Title : Effect of Silver Diamine Fluoride and Potassium Iodide on Micro- tensile and Shear bond strength of Glass Ionomer Restoration to Dentin of Primary Molar (In vitro study)
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Abstract
Silver diamine fluoride (SDF) has been identified as a bactericidal chemical that can reduce the adherence and growth of cariogenic bacteria. Moreover can be used to prevent the formation of secondary dentine caries around glass ionomer restorations (GIC). Thus, SDF can be a promising biological approach in the practice of minimally invasive dentistry against conventional restorative methods. SDF is proposed to present five positive features which include: non-invasive treatment, pain and infection control, simple application, low costs with minimal training required.
The current study was conductedto assess the effect of SDF and potassium iodide on the micro-tensile and shear bond strength of Glass ionomer restoration to dentin of primary molars. using sixty freshly extracted carious first and second primary molars and were collected according to inclusion and exclusion criteria from the Pediatric Dentistry and Dental Public Health department Faculty of Dentistry, Cairo University by the end of every day, teeth were stored in saline solution at room temperature for a maximum of two months. For the micro-tensile bond strength; twenty teeth were sectioned through the center of the carious lesion using a slow-speed cutting machine forming two similar halves. Following sectioning, these two specimens were randomly allocated to either the test group or the control group.
The test group treated with 38% SDF on the carious dentin surfacefollowed by application of Potassium Iodide (KI) and the control group treated with deionized water. After 12 days storage in saline, application of approximately four mm high GIC block on the SDF/KI modified carious dentin surface. The specimens were fixed in Acrylic blocks then sectioned using a slow-speed water-cooled diamond saw to obtain slices approximately of 0.7 mm thickness. Using the universal testing machine tensile bond strength was applied and stressed in tension at a crosshead speed of 1 mm per minute until bond failure.
For shear bond strength; teeth were divided into two groups, test group was treated with 38% SDF on the carious dentin surface followed by application of Potassium Iodide (KI). Control group teeth were treated with deionized water. After storage for 12 days in saline, a plastic cylindrical shaped mould with an internal diameter of 3 mm and a height of 4 mm was placed at right angles on the cut surface of the polished flat dentin and restored with GIC in increments to create a standardised bonding area. After 24 hours using the Universal Testing Machine a shear force was applied perpendicularly to the GIC cylindrical button at a distance of 1 mm from the dentine surface to the loading head.
The debonded samples for all groups were observed and recorded with a magnifying microscope. The Results for the micro-tensile bond strength showed that the average value for tensile bond strength did improve in the test group yet there were no statistically significant differences between the two groups. The results for the shear bond strength showed that the average value for shear bond strength did improve in the control group yet there were no statistically significant differences between the two groups.