Maddenin Yapısı Tekrar PDF

# Maddenin Yapısı Tekrar ## Common Properties of Material - Shape - Mass - Volume - Atom and molecule - Weight ## Metals - **Alloy:** The combination of two or more metals mixing. - **Metal types used in dentistry:** - Precious (Au, Pt, Pd) - Precious (Cr-Ni) - It is a good thermal and...

# Maddenin Yapısı Tekrar ## Common Properties of Material - Shape - Mass - Volume - Atom and molecule - Weight ## Metals - **Alloy:** The combination of two or more metals mixing. - **Metal types used in dentistry:** - Precious (Au, Pt, Pd) - Precious (Cr-Ni) - It is a good thermal and electrical conductor. - When the opaque structure is polished, it shows bright and light reflective properties. - **Malleability** - **Castable** (with lost wax technique) - It is hard and durable. ## Ceramics - Earthenware made of earth and then fired is generally called “ceramic”. - Ceramics are inorganic compounds composed of elements. - Glass, bricks, tiles, electrical insulators, porcelain, aerospace industry dentistry. ### Properties - Weak thermal conductivity. - Stable, biocompatible. - Transparent (light-transmitting). - Translucent (depending on the ores inside). - Three-dimensional crystal structure. - Fragile. ## Poisson Proportion - The ratio of how much the width (diameter) of an object whose length increases by 1 unit when force is applied decreases. ## Hardness - A material's resistance to scratching, cutting, abrasion is called hardness. - There are different types of hardness tests (such as Rockwell, Brinell, Vickers). - Hardness measurements by applying force, usually of the material with a sphere, cone or pyramid, a small notch is made on its surface. The resulting pit depth or size is measured. ## Factors affecting Surface Tension - **Type of liquid:** Equal temperature surface of liquid substances tensions are different from each other (yg of mercury 0,44 N/m, yg of water 0,073 N/m). - **Temperature:** Temperature and surface tension are inversely proportional. As the temperature increases, the surface tension decreases. - **Soap and Detergents:** Soap and detergents surface relieves tension. - **Density:** As the density of the liquid used increases surface tension increases. ## Surface Tension - It is the force that keeps the unit length taut on the liquid surface. - The effect of cohesion force on the liquid and the liquid surface behaves like a membrane. ## Hue - Hue is defined as the particular variety of a color. - The name of the color. - E.g. Red, Green, Yellow. ## Chroma - The intensity of the color, degree of saturation of a particular hue. - High Chroma - Low Chroma ## Value - The degree of lightness or darkness of a hue. - Light - Midtones - Dark ## Metamerism - It is the phenomenon that the colour of an object appears different depending on the light source. Two objects that appear the same colour when viewed under the same light source may appear different under different light sources; they can appear in different colours. ## Farklı Restorasyon Türleri İçin Önerilen Kompozit Reçineler | Type of Restoration | Recommended Resin Composite | |---|---| | Class 1 | Multipurpose, nanocomposite, packable microfilled (posterior),* compomer (posterior)* | | Class 2 | Multipurpose, nanocomposite, packable, laboratory, microfilled (posterior), compomer (posterior)* | | Class 3 | Multipurpose, nanocomposite, microfilled, compomer | | Class 4 | Multipurpose, nanocomposite | | Class 5 | Multipurpose, nanocomposite, microfilled, compomer | | Class 6 (MOD) | Packable, nanocomposite | | Cervical lesions | Flowable, compomer | | Pediatric restorations | Flowable, compomer | | 3-unit bridge or crown | Laboratory (with fiber reinforcement) | | Alloy substructure | Laboratory (bonded) | | Core build-up | Core | | Temporary restoration | Provisional | | High caries-risk patients | Glass ionomers, hybrid ionomers (see Chapter 8) | >*Special microfilled composites and compomers are available for posterior use ## Çeşitli Kompozit Reçinlerin Özellikleri | Type of Composite | Size of Filler Particles (µm) | Volume of Inorganic Filler (1%) | Advantages | Disadvantages | |---|---|---|---|---| | Multipurpose | 0.04, 0.2-3.0 | 60-70 | High strength, high modulus | | | Nanocomposite | 0.002-0.075 | 78.5 | High polish, high strength, high modulus. | | | Microfilled | 0.04 | 32-50 | Best polish, best esthetics. | Higher shrinkage. | | Packable | 0.04, 0.2-20 | 59-80 | Packable, less shrinkage, lower wear. | | | Flowable | 0.04, 0.2-3.0 | 42-62 | Syringeable, lower modulus. | Higher wear. | | Laboratory | 0.04, 0.2-3.0 | 60-70 | Best anatomy and contacts, lower wear. | Lab cost, special equipment, requires resin cement. |