Dental Materials Test 1 - MCQs

<p>Type V contains added accelerators and retarders (D)</p> Signup and view all the answers

<p>To create articulators (D)</p> Signup and view all the answers

<p>Stress, strain (B)</p> Signup and view all the answers

<p>250-450 (C)</p> Signup and view all the answers

<p>1874 (C)</p> Signup and view all the answers

<p>Malleability (B)</p> Signup and view all the answers

<p>95 (A)</p> Signup and view all the answers

<p>Elastic modulus (B)</p> Signup and view all the answers

<p>Thixotropic (D)</p> Signup and view all the answers

<p>Elastic limit (B)</p> Signup and view all the answers

<p>Formation of different electrolytes (C)</p> Signup and view all the answers

<p>Colloidal theory (A)</p> Signup and view all the answers

<p>Color of the adhesive (A)</p> Signup and view all the answers

<p>They can create stresses in the bond (A)</p> Signup and view all the answers

<p>They connect rehydrated plaster particles (B)</p> Signup and view all the answers

<p>Weakening of the adhesive bond (A)</p> Signup and view all the answers

<p>Dissolution of plaster and recrystallization (B)</p> Signup and view all the answers

<p>Corrosive environments (B)</p> Signup and view all the answers

<p>Yield strength (D)</p> Signup and view all the answers

<p>Shear (A)</p> Signup and view all the answers

<p>Knoops and Vickers (B)</p> Signup and view all the answers

<p>Fenestration (B)</p> Signup and view all the answers

<p>Must be biocompatible (C)</p> Signup and view all the answers

<p>Galvanic corrosion (C)</p> Signup and view all the answers

<p>Concentration Cell Corrosion (C)</p> Signup and view all the answers

<p>Occurs under stress and fatigue (B)</p> Signup and view all the answers

<p>Dentin contains varying areas of fluid which can affect adhesion. (B)</p> Signup and view all the answers

<p>To provide resistance to active carious lesions. (C)</p> Signup and view all the answers

<p>Direct restorative dental materials (C)</p> Signup and view all the answers

<p>IRM temporary filling material (C)</p> Signup and view all the answers

<p>It can impede the bonding process. (B)</p> Signup and view all the answers

<p>Type 1 (B)</p> Signup and view all the answers

<p>Materials used when making dental prosthetics. (D)</p> Signup and view all the answers

<p>It removes the smear layer for better bonding. (D)</p> Signup and view all the answers

Stress is force over area, while strain is deformation over length.

The average biting force for bicuspids is 250-450 pounds.

G.V. Black introduced an acceptable amalgam formula in 1895.

The ability to sustain permanent deformation without breaking under compression.

The Knoop hardness number for dentin is approximately 100.

Interpenetration, wettability, and macro-mechanical interlocking are factors affecting adhesion.

Sodium sulfate is a gypsum accelerator.

When light hits an object, it can be transmitted, scattered, dispersed, or absorbed.

The point beyond which a material will no longer return to its original shape after stress is removed.

Stress caused by two forces acting parallel to each other but not in the same straight line.

A material testing method used to measure the hardness of materials.

Joining materials using an adhesive that forms a strong bond between them.

A material that does not harm the surrounding tissues when used in the body.

Electrochemical corrosion caused by dissimilar metals in contact creating an electrical circuit.

Corrosion that occurs due to an immense fatigue or excessive cyclic loading.

Corrosion caused by variations in electrolyte concentration. It creates potential differences

Corrosion caused by electrolytes formed under food debris and saliva on metallic restorations.

Gypsum hemihydrate mixes with water, becoming a gel, then a solid.

Rehydrated plaster particles bond via hydrogen bonds to form a set.

Gypsum dissolves and recrystallizes, creating a strong, interlocking structure.

A clean surface is crucial for strong bonding, free from dirt and contaminants.

Bonding liquids must enter the etched surface's crevices.

Formation of a chemical bond between adhesive and surface.

Solidification of liquid adhesives causes volume reduction, weakening the bond.

The weakest and least expensive gypsum type; made from heated hemihydrate, resulting in porous, irregular particles. Used for complete or partial dentures and articulators.

Stronger and more expensive than plaster; made under controlled calcination, leading to uniform, less porous particles. Used for diagnostic casts, especially in orthodontics.

High-strength dental stone; made by calcining with chloride solution, forming dense, cuboidal particles. Used for inlays and other dental prostheses.

Similar to Type IV but with added accelerators and retarders, resulting in high expansion. Primarily used for inlays and onlays, ensuring a precise fit.

Type II Dental Plaster is the weakest and least expensive, made with irregular particles, while Type III Dental Stone is stronger and more expensive, with uniform particles. Type II is used for dentures and articulators, while Type III is used for diagnostic casts.

The challenge of bonding to dentin arises from its organic composition, tubular nature, and the presence of a smear layer. The tubules allow dentinal fluid to flow, affecting adhesion, while the smear layer hinders bonding. Acid etching is required to remove the smear layer for proper adhesion.

A thin layer of debris formed on dentin during cutting or preparation. It's composed of fragmented dentin, cut enamel, and saliva remnants. It hinders bonding, requiring removal by acid etching for proper adhesion.

Materials used to prevent tooth decay and disease progression. They contribute to oral health by inhibiting bacterial activity, sealing tooth surfaces, and providing fluoride release. These include mouthwashes, varnishes, pit and fissure sealants, and fluoride-releasing cements.

Materials used to repair or replace damaged tooth structure. They are categorized as direct (used directly in the mouth) or indirect (fabricated outside the mouth). This category includes fillings, sealants, fluoride treatments, crowns, and dentures.

Materials used in the fabrication of dental prosthetics. Examples include dental wax used in impression taking, bite registrations, and custom tray construction. These materials help create accurate models and replicas for prosthetic procedures.

Materials used to provide temporary restorations for short durations. Examples include IRM temporary filling material and temporary crowns used to protect teeth until a permanent restoration is placed. They allow healing and provide a protective barrier while waiting for the permanent solution.

A gypsum material previously used for taking impressions in patients with edentulous ridges. It contained chemical flavors for improved taste. This material has largely been replaced by other impression materials due to its inferior accuracy and handling properties.

Restorative procedures performed outside the mouth. These involve fabricating prosthetics, such as dentures or crowns, on models or casts. These procedures require multiple steps and involve collaboration with dental laboratories.