adhesive-dentistry-myth-or-magic113 (1).pdf - ADHESIVE...

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ADHESIVE DENTISTRY MYTH OR MAGIC LCDR ROD GUNNING, DC, USN
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ADHESIVE DENTISTRY MYTH OR MAGIC LCDR ROD GUNNING, DC, USN
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ADHESIVE DENTISTRY MYTH OR MAGIC Background 1955-Buonocore applied acid to teeth to render the tooth more receptive to adhesion. 1956- First commercially available bonding agent. 1978- Second generation adhesives introduced. 1980’s- Total etch concept gains acceptance. 1990’s-Hybrid layer concept 1990’s- Multistep and one step adhesive systems.
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ADHESIVE DENTISTRY MYTH OR MAGIC Present Universal, all purpose, or multipurpose adhesive systems claim to bond to enamel, dentin, amalgam, metal, and porcelain such that making an appropriate product selection for use in daily practice becomes difficult.
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ADHESIVE DENTISTRY MYTH OR MAGIC Terminology Adhesion or bonding- The forces or energies between atoms or molecules at an interface that hold two phases together. Adherend- The surface or substrate that is adhered. Adhesive/ adherent/ bonding agent/ adhesive system- A material that can join substances together, resist separation, and transmit loads across the bond.
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ADHESIVE DENTISTRY MYTH OR MAGIC Terminology Adhesive failure- The bond that fails at the interface between the two substrates. Cohesive failure- The bond fails with in one of the substrates, but not at the interface.
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ADHESIVE DENTISTRY MYTH OR MAGIC Potential Advantages Microleakage reduction. Postoperative sensitivity reduction. Marginal staining reduction. Reinforce weakened tooth structure. Does not act like a wedge.
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ADHESIVE DENTISTRY MYTH OR MAGIC Potential Advantages Repair deteriorating or debonded restorations. without additional loss of tooth structure. Expands range of esthetic possibilities. Minimizes removal of sound tooth structure.
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ADHESIVE DENTISTRY MYTH OR MAGIC Indications Replace carious and fractured tooth structure. Fill erosion or abrasion defects in cervical areas. Correct unaesthetic shapes, positions, dimensions, or shades. Bond silver amalgam restorations. Cement crowns.
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ADHESIVE DENTISTRY MYTH OR MAGIC Indications Bond orthodontic brackets. Treat dentinal hypersensitivity. Repair fractured porcelain, amalgam, and resin restorations. Pit and fissure sealants. Core build up foundations.
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ADHESIVE DENTISTRY MYTH OR MAGIC Principles of Adhesion Mechanical Theories Adsorption Theories Diffusion Theories Electrostatic Theories Etched Enamel
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ADHESIVE DENTISTRY MYTH OR MAGIC Adhesion to enamel is much easier to achieve than is adhesion to dentin. Enamel contains primarily hydroxyapatite, which has a high surface-free energy, whereas dentin is composed of two distinct substrates, hydroxyapatite and collagen which has a low surface free energy.
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