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33 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Class_____are curious lesions located on the gingival 3rd of the facial or lingual surface? |
ClassV |
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Is the term indicating the gradual loss of tooth structure along the biting surface due to occlusal wear? |
Attrition |
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Your efda or dentist can confirm that a new restoration is equal forces in maximal intercospel positions by using articulating paper |
True |
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What are the four main ingredients in amalgam? |
Silver tin copper zink |
Saint cz |
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Four medals sometimes added to amalgam in small amounts |
Palladium, Indium selenium and gold |
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And an amalgam Restoration with low copper has less than what percent of copper in it |
9% |
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And amalgam restoration that is labeled high copper has what percentage of copper in it |
12% to 30% |
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What is added to amalgam to help decrease expansion (Creep) and has a less marginal breakdown? |
Copper |
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What is added to amalgam that aids in combining the Mercury with the alloy? |
Tin |
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What is added to amalgam that prevents oxidation during manufacturing processes also reduces brittleness |
Zinc |
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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 |
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Term that describes the reaction between the alloy and the mercury |
Amalgamation |
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The combination of tin and mercury results in what process? |
Gamma two-phase |
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This leads to an increase inflow and corrosion and a decrease in strength that predisposes the restoration to fracture |
Gamma 2 phase |
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This term is the slow change in dimensions of the amalgam due to prolonged exposure to stress |
Creep |
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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 |
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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 |
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Name the two types of alloy particles |
Lathe cut and spherical cut |
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This type of alloy particle has the cutting rate is precisely controlled to maintain the desired average particle size and size distribution |
Lathe cut |
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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 |
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This type of matrix band is essential to prevent flat proximal contours improper contacts and overhanging cervical margins |
A. Contoured and wedged matrix |
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This term says the longer the mixing time, the less expansion, or the greater the contraction |
Trituration time |
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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 |
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Condensation increasing pressure during placement does what to the expansion? |
Condensation increasing pressure during placement decreases the expansion |
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Contamination of water can cause excessive delayed expansion because of |
The hydrogen bubbles |
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This greatly increases the amount of expansion in the alloy and is even more pronounced in zinc containing alloys |
Contamination moisture |
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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 |
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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 |
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Doing this produces a dryer mix lax, Mercury and lax cohesive to the mass. When it is placed it reduces amalgam strength |
Under tituration |
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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 |
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This occurs when dissimilar metals in the mouth such as silver amalgam restorations against gold restorations acts like a battery |
Galvanism |
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This term is time dependent, strain or deformation that is produced by a stress |
Creep |
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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 |
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