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    Does the Use of Ozone as a Cavity Disinfectant Affect the Bonding Strength of Antibacterial Bonding Agents?
    (Taylor & Francis Inc, 2020) Cangul, Suzan; Erpacal, Begum; Adiguzel, Ozkan; Sagmak, Savas; Unal, Server; Tekin, Samet
    The aim of this study was to evaluate the use of ozone as cavity disinfectant on the bonding strength to dentin of different antibacterial bonding agents. The study was conducted on 60 cavity-free 3rd molar teeth. The prepared samples were separated into 3 groups. These groups were each sub-divided into 2 groups of 10 as a group with ozone applied and a control group. In Group 1a, ozone was applied as cavity disinfectant for 6 secs to all the exposed dentin surfaces then restoration was applied. In Group 1b as the control group, the restoration stages were applied without any cavity disinfection. Gluma 2 Bond, our first antibacterial adhesive material, was applied to all dentin surfaces and polymerized. The second and third groups were divided into two groups. Clearfil SE Protect Primer and Clearfil SE Protect Bond were applied in the group 2. Peak Universal was used in Group 3. After the application of the adhesive materials and then Estelite posterior quick composite was applied and polymerized. The bonding strengths of all the samples were measured in an Instron test device. The data were statistically analyzed using the Mann Whitney U-test and the Kruskal Wallis test. The highest bonding strength was determined in Gluma 2 Bond (7,79), and the lowest bonding strength was in Peek Universal (3,43). It was concluded that ozone adhesive systems can be safely currently used as they have been shown to increase bonding strength and can eliminate bacteria.
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    Three-dimensional finite-element analysis of two ceramic inlay restorations with different cavity designs
    (Taylor & Francis Ltd, 2015) Guven, Sedat; Akdogan, Mehmet; Oz, Cihan; Dogan, Mehmet Sinan; Unal, Mehmet; Unal, Server; Sahbaz, Cafer
    The aim of this in silico investigation was to examine the influence of two ceramic inlay materials with different cavity designs on stresses in the inlay. Finite-element analysis and three-dimensional modelling were used to examine the stress in ceramic inlays resulting from a 250-N point load on occlusal surfaces. The adhesion properties and von Mises stress values in the enamel, dentin, ceramic materials and cement linings were simulated. Two ceramic inlay materials: porcelain ceramic (Empress II, Ivoclar Vivadent, Liechtenstein) and zirconia ceramic (ICE Zirkon, Zirkonzahn SRL, Gais, Italy), as well as two cavity corner designs: rectangular and rounded, were evaluated. The obtained von Mises stress results indicated that the maximum and minimum forces were concentrated in the enamel and dentin, respectively. The stress values in the dentin and inlay material were similar in the porcelain ceramic and zirconia ceramic groups. However, in the enamel, the stress values in the zirconia ceramic group were significantly lower than those in the porcelain ceramic group. Additionally, cavities with rounded corners were subject to significantly less stress compared to those with rectangular corners. Thus, the zirconia ceramic inlay demonstrated better performance under applied stress, based on the reduced stress values in the tooth structure. Cavities with rounded corners showed less stress than those with rectangular corners, which could be attributed to the enhanced stress distribution capabilities of rounded corners.