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33 Cards in this Set

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Class_____are curious lesions located on the gingival 3rd of the facial or lingual surface?

ClassV

Is the term indicating the gradual loss of tooth structure along the biting surface due to occlusal wear?

Attrition

Your efda or dentist can confirm that a new restoration is equal forces in maximal intercospel positions by using articulating paper

True

What are the four main ingredients in amalgam?

Silver tin copper zink

Saint cz

Four medals sometimes added to amalgam in small amounts

Palladium, Indium selenium and gold

And an amalgam Restoration with low copper has less than what percent of copper in it

9%

And amalgam restoration that is labeled high copper has what percentage of copper in it

12% to 30%

What is added to amalgam to help decrease expansion (Creep) and has a less marginal breakdown?

Copper

What is added to amalgam that aids in combining the Mercury with the alloy?

Tin

What is added to amalgam that prevents oxidation during manufacturing processes also reduces brittleness

Zinc

Metals such as palladium, gold and Indian and smaller quantities have been included to alter the what in amalgams

Corrosion resistance in certain mechanical properties of the finished amalgamass

Term that describes the reaction between the alloy and the mercury

Amalgamation

The combination of tin and mercury results in what process?

Gamma two-phase

This leads to an increase inflow and corrosion and a decrease in strength that predisposes the restoration to fracture

Gamma 2 phase

This term is the slow change in dimensions of the amalgam due to prolonged exposure to stress

Creep

The major cause of gross fracture of amalgam restorations is usually found in

Design of the cavity preparation. Sufficient bulk of the material must be provided to support applausal forces

Characteristics of amalgam are three things

1)the size and shape of the allied particles 2) the ratio of mercury to alloy. 3) Manipulation such as mixing time, titration and condensation

Name the two types of alloy particles

Lathe cut and spherical cut

This type of alloy particle has the cutting rate is precisely controlled to maintain the desired average particle size and size distribution

Lathe cut

This size and shape of alloy particle is round. They require less mercury because they have smaller service area per volume then do the lathe cut alloys

Spherical alloy particles

This type of matrix band is essential to prevent flat proximal contours improper contacts and overhanging cervical margins

A. Contoured and wedged matrix

This term says the longer the mixing time, the less expansion, or the greater the contraction

Trituration time

What is Mercury alloy ratio?

The greater the percentage of Mercury in the final amalgam, the greater the expansion of the material and the lower the strength of the final amalgam

Condensation increasing pressure during placement does what to the expansion?

Condensation increasing pressure during placement decreases the expansion

Contamination of water can cause excessive delayed expansion because of

The hydrogen bubbles

This greatly increases the amount of expansion in the alloy and is even more pronounced in zinc containing alloys

Contamination moisture

Slight expansion of an amalgam is beneficial because

It allows the restoration to fit tightly in the preparation, minimizing leakage along the interface between the restoration and the tooth

Fractures more likely to happen in the proximal area of a class 2 amalgam because

The tinsel strength of amalgam, which resists being pulled apart is only about 1/8 the compressive strength

Doing this produces a dryer mix lax, Mercury and lax cohesive to the mass. When it is placed it reduces amalgam strength

Under tituration

This results in porosity or voids that decrease strength results in excess mercury that weakens the amalg Restoration and leaves it more susceptible to corrosion and tarnish

Inadequate condensation force

This occurs when dissimilar metals in the mouth such as silver amalgam restorations against gold restorations acts like a battery

Galvanism

This term is time dependent, strain or deformation that is produced by a stress

Creep

Two ways Mercury and alloy can be packaged

Dispenser that accepts a vial of pellets and container of Mercury or a second way Mercury combination is the prepackaged proportion disposable capsules