6 Operative Dentistry I: Amalgam Restoration

<p>48-60 MPa (C)</p> Signup and view all the answers

<p>Amalgam is less stiff than dentin. (A)</p> Signup and view all the answers

<p>Decreases the strength of the amalgam. (C)</p> Signup and view all the answers

<p>High copper amalgam. (C)</p> Signup and view all the answers

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

<p>More than 12% (D)</p> Signup and view all the answers

<p>Prevent oxidization of other metals in the alloy (D)</p> Signup and view all the answers

<p>Gamma 2 (D)</p> Signup and view all the answers

<p>Silver, tin, copper alloy, and mercury (B)</p> Signup and view all the answers

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

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

<p>Mercury-sensitive patients (C)</p> Signup and view all the answers

<p>Increase in tarnish resistance (C)</p> Signup and view all the answers

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

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

<p>Core build up for crowns (D)</p> Signup and view all the answers

<p>After 7 days (A)</p> Signup and view all the answers

<p>More difficult tooth preparation (B)</p> Signup and view all the answers

<p>More than 0.01% Zn (B)</p> Signup and view all the answers

<p>Lathe-cut alloy (D)</p> Signup and view all the answers

<p>Spherical, lathe-cut, and admix (C)</p> Signup and view all the answers

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

<p>High mercury content (B)</p> Signup and view all the answers

<p>20 minutes (C)</p> Signup and view all the answers

<p>Post-operative sensitivity (D)</p> Signup and view all the answers

<p>It will expand (B)</p> Signup and view all the answers

<p>Discoloration due to chemical reaction (D)</p> Signup and view all the answers

<p>20 $ ext{μm/cm}$ (B)</p> Signup and view all the answers

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

A metallic restorative material made of silver-tin-copper alloy mixed with mercury. It's pressed into a cavity to restore tooth shape and function.

Easy to use, strong, resists wear, and has good long-term results. It's also relatively inexpensive.

Not attractive, may need more tooth removal, not insulating, and has some environmental concerns.

Used in posterior teeth, large cavities, areas with limited moisture, and as core buildup for crowns.

Avoid in esthetic regions, small cavities, patients sensitive to mercury, and where composite offers more conservative solutions.

Amalgam categorized by particle shape (spherical, lathe-cut, or admixture), copper content, and zinc content. Different shapes offer different handling characteristics.

A mixture of silver–tin–copper alloy and mercury.

A chemical process where mercury combines with the alloy to set the filling.

Dental amalgam with less than 6% copper, primarily composed of silver-tin and mercury.

Dental amalgam with more than 12% copper, containing silver-copper and silver-tin phases in addition to mercury.

The ability of amalgam to withstand force pushing in on it, measured in Mpa.

A restorative material used in dentistry to fill cavities and repair teeth.

Increases amalgam strength, but also increases tarnish and corrosion.

Decreases amalgam strength and expansion but improves flow and creep.

Prevents oxidation of other metals, and raises strength and creep resistance.

The tendency of amalgam to deform or flow over time.

The elements in amalgam affect how much it creeps (deforms).

Correct manipulation methods (mixing and condensing) can reduce creep in amalgam restorations.

Amalgam's tendency to change its shape or size due to various factors like temperature or chemical reactions.

Amalgam can expand slowly over days or weeks after its initial set.

High mercury content results in more expansion in amalgam restorations.

Improper mixing can cause dimensional changes in amalgam: under-trituration leads to expansion; over-trituration leads to contraction.

Metals lose their shine or break down due to reactions with environment (Corrosion), and discoloration (Tarnish).

Amalgam's ability to withstand pulling forces. Low copper amalgam has the lowest tensile strength.

A measure of how stiff a material is. Indicates how much it resists deformation under stress. High copper amalgam is stiffer than low copper amalgam.

Time-dependent deformation of amalgam under continuous load. Creep happens after setting, while flow happens while setting.

Temperature significantly impacts amalgam strength. Significant drop in strength when temperatures climb from root to body.

High mercury content decreases amalgam strength. Low mercury content is ideal for strength and consistent surface.

The process of mixing the amalgam components impacts its strength. Proper mixing is crucial for optimal strength in fillings.

Amalgam 'packing' affects its strength. Different alloys require different packing techniques