Dental Porcelain Quiz

What is feldspathic porcelain composed of?

• Glass matrix phase only

• Silica phase only

• Crystalline phase only

• Glass matrix phase and one or more crystalline phases

Which of the following is NOT an application of feldspathic porcelain?

• Inlays and onlays

• Single crowns

• Dental implants

• Ceramic orthodontic brackets

What is the basic glass former in feldspathic porcelain?

• Opacifiers

• Feldspar

• Silica

• Glass modifiers

Which phase of feldspathic porcelain contributes to the strength of porcelain?

• Silica phase

• Crystalline phase

• Vitreous phase

• Glass modifier phase

What is the function of glass modifiers in dental porcelain?

• Increase the flow of porcelain during firing

• Lower the fusion temperature

• Decrease the flow of porcelain during firing

• Increase the fusion temperature

Which of the following is commonly used as an opacifier in dental porcelain?

• Alumina

• Zirconium

• Tin

• Titanium

At what temperature does low fusing dental porcelain typically fire at?

• 1300°C

• 1101°C

• 850°C

• <850°C

What is the purpose of condensation in the construction of a porcelain jacket crown?

• To prevent sintering

• To decrease the strength of porcelain

• To increase firing shrinkage

• To remove water from the material

Which method is used to overcome the deficiencies of ununiform shrinkage in porcelain?

• Both A and B

• Strengthening Brittle Materials

• Designing components to minimize stress concentration

• None of the above

What is the main reason for the failure of metal-ceramic bonding in dental restorations?

• Thermal residual stresses

• Cohesive failure within the porcelain

• Chemical bond failure

• Adhesive failure at the interface between metal and oxide layer