Dental Ceramics

Dental ceramics ______.

all of the options

Which of the following ceramic restorative materials is NOT used in dentistry?

resin-based

Which of the following materials is an ultra-low fusing temperature of (less than 850°C)  porcelain used for?

Ti-based alloys

Which of the following is NOT used to classify ceramics?

composition

Statement 1: Sintering is the process of heating closely packed particles to achieve inter particle bonding. 

Statement 2: Sintering process is used only for dental porcelain, NOT glass-ceramics.

Statement 1 is true; statement 2 is false.

The purpose of glass modifiers is/are:

all of the options

All of the following is the correct pairing of dental porcelain compositions and their  functions, EXCEPT:

cristobalite – opacity

Which of the following is true about the sintering process? 

fusion of grains

Which of the following is NOT a requirement for a metal-ceramic system?

Ceramics should not fully wet the alloy surface during firing

Statement 1: The mechanical property of substrate metal and porcelain is a crucial method  of bonding porcelain to metal. 

Statement 2: The bonding mechanism of thermal contraction inhibits both compressive  ability and tensile strength of a porcelain fused to metal restoration.

 Statement 1 is true; statement 2 is false.

Due to the shrinkage of dental porcelain, approximate how much larger should you make  the crown when compared to the size of the required crown?

11% to 15%

What is the most widely used dental ceramic restorations in private practices today?

zirconia-based

Which of these material qualities is NOT considered an advantage of pressable lithium  disilicate ceramics?

strength

What is the flexural strength value of conventional (3Y) zirconia?

900-1120 MPa

Which of the following is machined ceramic and has the highest flexural strength?

conventional zirconia

Which of the following best describes a property of ceramic materials?

low tensile strength

The following characteristics describe the properties of ceramic materials, EXCEPT:

low fusing temperature

The function(s) of kaolin in dental porcelain__________

are to provide opacity and control viscosity

The function(s) of quartz in dental porcelain__________

Is to act as a binder

The function(s) of feldspar in dental porcelain__________

Is to provide strength and act as a binder

The following are the part of the requirements of a metal-ceramic system, EXCEPT:

Fusing temperature of ceramics should be at least 100°C higher than the melting range  of substrate alloys.

What are two advantages to metal-ceramic restorations?

1. Adequate maringal integrity

2. Predictable strength

Which of the following is not a fabrication technique used for classifying ceramic materials? 

electroplating technique

Which of the following is the result of glazing dental porcelain?

All of the options

Addition of alkali ions and flux as well as combined with crystal silica will form

a low fusing glass

The purpose of using glass modifiers from crystalline silica to sodium silicate glass is to ___________

all of the options

he fusing temperature of ceramic materials used for porcelain-fused to metal restoration  is_______

850°C - 1100°C

Which of the following is the correct matching between metal oxide and pigment color?

all of the options

The major opacifying oxides used in masking metal substrate of porcelain-fused to metal  restoration are_______

TiO2 + SnO2