on the shear bond strength (SBS) of metallic orthodontic brackets bonded to feldspathic ceramic by a composite resin. Twenty-five ceramic cylinders were etched with 10% hydrofluoric acid for 60 s and received two layers of silane. Brackets were bonded to the cylinders using Transbond XT and assigned to 5 groups (n=5): Group 1 – Control group (without thermal cycling); Group 2 – 500 thermal cycl...

INTRODUCTION The objective of this study was to compare the resistance to enamel demineralization between self-etching primer (SEP) and conventional sealant in vitro. METHODS A total of 120 molar sections were randomly assigned to 3 groups: SEP (Transbond Plus, 3M Unitek, Monrovia, Calif), sealant (Light Bond fluoride-releasing sealant, Reliance Orthodontic Products, Itasca, Ill), or control ...

Aim and Objectives: To compare evaluate the antibacterial efficacy of various nanoparticles incorporated in orthodontic primer with that conventional antimicrobial agents at different concentrations on Streptococcus mutans ( S. mutans) strain. Materials Methods: Transbond XT Primer was mixed 2.5% 5% benzalkonium chloride (BAC), 0.2% chlorhexidine, 1% 3% titanium dioxide (TiO 2 ) nanoparticles, ...

Background: The purpose of this study was to evaluate the effect in vitro long-term simulation oral conditions on bond strength PEEK CAD/CAM lingual retainers. Material and methods: sample consisted 12 retainers each composed 2 centrally perforated 3x4mm pads joined by a connector. They were treated 98% sulfuric acid for 1 minute then conditioned with Single Bond Universal bonded surface premol...

based on the molecular modeling studies on two major families of anxiolytics and sedative hypnotics (benzodiazepines and barbiturates) a series of phthalimide derivatives were prepared from corresponding di-methyl phthalate derivatives in two steps, namely trans-amidification and ring closer of di-methyl phthalate with urea and base catalysed condensation of 4-bromobenzyl chloride and benzoyl c...

background and objectives cannabinoids which are active compounds of marijuana show some pharmacological effects similar to the opioids. there are also functional interactions between both cannabinoid and opioid systems. in this study we investigated the role of cannabinoid receptors in central amygdala and its interaction with opioid system.   methods in the present study, we investigated the ...

In this paper we generalize the max plus algebra system of real matrices to the class of real tensors and derive its fundamental properties. Also we give some basic properties for the left (right) inverse, under the new system. The existence of order 2 left (right) inverses of tensors is characterized.