Past MCQ
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At what temp does feldspathic ceramic form leucite?
• 1150-1500degrees C
What is Leucite?
• Potassium aluminium silicate
What is PROCERA?
• > 99% alumina core • Produced at about 1700 celcius
What temp is Zirconia sintered at?
• 1600C
What is the max amount of strain porcelain will undergo before fracture?
• 0.5%
What is the expansion of gold ?
• 1.4%
What is the expansion of Ni/Cr?
2.0%
What is the expansion of Co/Cr?
2.3%
What is the longevity of GIC, SSC and Amalgam?
SSC = 92% Amalgam = 80% GIC = 66%
What are the reasons and % for post core failures?
• 60% due to restorative • 32% due to perio • 8% due to endo
What are some temp materials used?
PMMA:Jet PEMA: Snap / TRIM Bis-acrylate composite : Protemp UDMA : Provipont
What material has best mechanical properties for restoration of occlusal surfaces?
• Gold
What is the best method for retaining a core ?
• Use of adhesive only
When preparing upper first permanent molar for metal-ceramic crown, a functional bevel is placed on which cusp?
• Mesio-palatal
What is the correct degree of axial-taper in ideal crown prep?
• 7degrees
The fit surface of a porcelain laminate veneers is prepared with what acid?
• Hydrofluoric acid