MCQs of Dental Materials – Metallurgy

All of the following statements about cast cobalt alloy are true EXCEPT:

The contraction of gold alloy on solidifying is approximately:

Addition of large amounts of platinum to a casting gold alloy will

The pattern for the metallic framework of a removable partial denture is fabricated from:

Ideal requirement of metal ceramic casting:

Gap between true end of casting ring and wax pattern should be:

Which of the following is correct:

Which is the use of boxing an impression:

The strength of a gypsum investment is dependent on:

Resistance to corrosion in a cobalt-chrome casting is due to presence of:

The main form of iron carbide found in 18-8 steel:

Flux is used during casting to:

NiTi alloy have

The maximum carbon content of steel used in dentistry is

Pickling:

Wax pattern is ideally invested immediately to decrease the dimensional changes caused by:

Stainless steel orthodontic wire can be hardened by:

The most commonly used Titanium alloy for dental and medical purposes is:

A thinner mix of a gypsum bonded investment will:

Cobalt-Chrominum alloys contains:

Which one of the following is most elastic?

Gypsum bonded investment should not be heated over:

Cleaning of base metal alloy is done by:

Glossy smooth margins of a casting are due to:

Which of the following zones is used for melting alloy during casting:

Incomplete casting is the result of:

Back pressure porosity can be avoided by:

Mouth temperature waxes are:

Setting expansion is advantageous in:

Indium in metal alloys:

Tempering of steel cause

In a patient with allergy to costume jewelry, which of the following is contraindicated:

Which of the following will produce the most rigid restoration for framework of same dimension?

Tublulence of molten gold is due to :

Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is:

A highly polished surface on a metallic dental restoration aids considerably in the prevention of the:

Austenite is an alloy of iron of and carbon with the iron in:

The yield strength of AUstenite (NiTi alloy) is:

Which zone is the hottest and efficient burning zone of the flame used for casting?

Stabilization of stainless steel is achieved by adding:

Localised shrinkage porosity is seen when there:

The function of a sprue is to:

Sub surface porosity can be decreased by:

Softening heat treatment of alloy increases:

The inlay wax most commonly used for direct technique:

Reduction in the fusion temperature of dental gold casting alloys is caused by presence of:

The purity of gold is expressed in:

Function of carnauba wax:

In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to:

The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called:

Investment material used for cobalt-chromium alloys is:

The standard perforated tray for us with alginate impression materials may be brought to more customized contour by:

Silica sol:

The base constituents of dental waxes come from three main sources except:

Boxing wax is also called as:

Stainless steel is used mostly in dentistry:

Shape memory in NiTi is because of stress induced form:

A common electrolyte used for plating copper indirect dies is:

Casting shrinkage is compensated by:

Waxes are used for:

The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5:

Passivating alloys are:

Impurities in casting is removed by:

Which of the following refractory is used to counteract most of the expansion

Shape memory is seen in:

Crucible indicated for casting base metal alloys is:

The best pickling solution for gypsum bonded investment is:

Heat hardening is the process done at:

Corrosion of stainless steel is due to formulation of:

Titanium casting is done:

The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing?

Gold content of an 18 carat alloy is:

Which one of the following categories of dental materials has the highest thermal conductivity>

The sprue in wax pattern should be placed:

Most biocompatible material in oral cavity is:

Quartz in investment material is added for:

Which of the waxes are derived from the lignite:

Inlay wax is used to:

Silver plated dyes use an electrolytic bath of:

18-B Stainless steel orthodontic wire has:

Suck back porosity is due to:

Disadvantage of having a short sprue is:

Air bubbles formed on the surface of casting is probably due to:

Who was the first person to introduce cast inlay restoration into dentistry?

Asbestos liner is used in a casting ring to:

The main ingredient of inlay wax is:

Which of the following decrease with strain hardening

Casting flux is used to:

Suck back porosity in the casting can be eliminated by:

Gases dissolved in molten metals are liberated when cooled giving rise to:

The component in very minor quantity in stainless steel that changes the properties to a maximum level is:

Percentage of gold in high noble alloy is:

Binder used in Gypsum investment is:

Which of the following is function of fluoride flux in soldering process?

Nickel-Titanium alloy has

The deoxidizing agent added to dental alloys is:

Advantage of titanium over other base metal alloys

Function of wetting agents used in casting procedure is:

Component of inlay wax which makes it flake resistant is:

The rate of tarnish and corrosion of class II cast material having VHN 200 is:

Microstructure of cobalt chromium alloy in cast condition is:

Within an hour after cementation of cast gold onlay patient complains of shooting pain every time the teeth comes together Most probable explanation is?

Dendrites in cst alloys form by mechanism of:

Which one of the following elements is NOT added is small amount to be used as grain refiners?

Compared with noble metals, base metals show

Binder in phosphate bonded investment is:

Mechanical properties of Cp Titanium are similar to alloys

Which of the following fuel gases used for soldering, has the highest heat content

The effects associated with cold working can be eliminated by a heat treatment called:

Which of the following increases castability of base metal alloys:

With indirect spruing. Which one of the following porosities can be minimised

During soldering, the solidus temperature of the filler material should be:

The linear solidification shrinkage of Type IV Ni-Cr based alloys is:

The solvent flux used for base metal soldering is:

Which of the following cast gold alloys is used for fabricating partial denture frameworks

In Base metal alloys, Corrosion resistance occurs due to:

Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of:

The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is:

Nickel is added to wrought gold alloys as:

Fins and spines on the casting is seen due to:

Stages of annealing in order

Solder and flux used for joining Elgiloy wires are:

Dr. Taggart is associated with:

Which of the following fuel gases is the best choice of heat source to carry out soldering process?

The term ordered hardening heat treatment used in which of the following dental alloys?

The best fuel gas when used with oxygen is:

Linear coefficient of thermal expansion of metal used for metal caramic restoration range from:

Annealing is also known as:

Quartz is added to gypsum bonded investment to: