Pg1Pg1 CONSERVATIVE OPERATIVE DENTISTRY Page 1 Lecture: Bonding Systems (Enamel‚ Dentin‚ Compomer‚ Amalgam‚ Resin Cement) OVERVIEW OF BONDING SYSTEMS: A. Goals of Bonding (and Adhesion): 1. Sealing 2. Retention B. Definitions and Terminology for Adhesion: 1. Terminology for adhesion: a. Adhesive- material forming the layer b. Adherend- substrate being bonded c. System (EBS‚ DBS) and agents (EBA‚ DBA‚ ABA)
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Cathy Griffin Dr. Edwards SOC 3413 06 JAN 2012 Bridging and Bonding The greatness of any organization or community is dependent upon the group’s ability to collect‚ accept and utilize inputs from a variety of source. In a small community consideration of all interested parties insures the participation and support when changes are needed. This unity of diverse groups whether social‚ ethnic or cultural for the good of a community is call bridging. Utilizing information gather from multiple
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1.1 INTRODUCTION Chemical bonding – the force of attraction between the two atoms Valence electron – the outer most shell electrons There are three types of chemical bonding i. Ionic bond: ________________________________________ ii. Covalent bond: _____________________________________ iii. Dative Covalent bond: _______________________________ 1.1.1 LEWIS DOT SYMBOL A shorthand to represent the valence electron of an atom. The element symbol
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2. I noticed that all of the ionic compounds are soluble in water. This is due to the fact that water molecules are polar. Meaning that they have dipole bonds‚ which have a slightly positive and slightly negative end due to electronegativity differences between atoms. When ionic bonds are placed in water‚ they dissociate into their ions (positive and negative) due to the process of dissociation. These ions are then attracted to different dipoles present in the water molecule‚ in other words the negative
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1. Define the following terms: * Bonding – the basic link of trust between infant and caretaker. It develops from repeated completions: infant need> crying> rage reaction> parental action to meet need> satisfaction> relaxation. Successful bonding results in an infant acquiring a basic trust in others as responsive‚ in the world as a benign place‚ and in self as able to communicate needs. * Attachment – is defined as a person-specific relationship that is dominated by affectionate interchanges
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When ionic solids dissolve‚ they divide to give their positive and negative ions that make up the solids. These ions become hydrates and have the same relative proportions when in solution and when solid. The more the solid dissolves‚ the more the ion’s concentration increases. This increase and build-up allows for the reverse reaction to occur. In this phase of the reaction the ions crystallise out in order for the reaction to have a greater chance of occurring. Eventually the rate of
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Metallic Bonding Metallic Bonding Why do metals conduct electricity? Metals conduct electricity. The delocalised electrons are free to move throughout the structure in 3-dimensions. They can cross grain boundaries. Even though the pattern may be disrupted at the boundary‚ as long as atoms are touching each other‚ the metallic bond is still present. Liquid metals also conduct electricity‚ showing that although the metal atoms may be free to move‚ the delocalisation remains in force until the
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FAMILY BONDING The Norman Rockwell family gathered around the table is an image many know. The whole family happily gathered together in anticipation of a shared meal. In the essay‚ “The Magic of the Family Meal”‚ Nancy Gibbs talks about this dying tradition of sitting down with the family to share in a meal. Life is constantly happening around us and sometimes we don’t take the time to sit and enjoy the company of our family‚ the bonds it can create‚ and the benefit it can have on children. Sitting
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180 Lab 5: Ionic Reactions Submitted by Abstract: The purpose of this experiment is to work with aqueous solutions of ionic substances. Aqueous solutions are those solutions in which water is the solvent. When ionic substances are dissolved in water‚ the ions separate and become surrounded by water molecules. The focus of this experiment is on precipitates. The goal of this experiment is to study the nature of ionic reactions‚ write balanced equations‚ and to write net ionic equations for
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Nomenclature for Ionic Compounds Ionic compounds consist of cations (positive ions) and anions (negative ions). The nomenclature‚ or naming‚ of ionic compounds is based on the names of the component ions. Here are the principal naming conventions for ionic compounds‚ along with examples to show how they are used: Roman NumeralsA Roman numeral in parentheses‚ followed by the name of the element‚ is used for elements that can form more than one positive ion. This is usually seen with metals. You
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