274+ quick-fire dental facts • tap a card to flip
The recommended force for condensing a composite resin using a 0.5 mm diameter condenser nib is 3.75 pounds. This is the force that is well within the physiologic limits of the tooth and provides effective condensation.
What is the typical force applied during the condensation of a 0.5 mm diameter condenser nib?
1) 0.04-0.4 µm
2) 1-5 µm
3) 3.75 pounds
4) 8.43 pounds
A higher degree of polymerization in resins generally correlates with greater strength, as more polymer chains are formed and cross-linked.
How does the degree of polymerization affect the strength of resin?
1) There is no correlation between the two
2) Higher degree of polymerization results in increased strength
3) Lower degree of polymerization results in increased strength
4) The strength is unaffected by the degree of polymerization
Compressive and tensile strengths of spherical alloys are greatest at normal trituration time.
What is the effect of trituration time on the dimensional change of spherical amalgam alloys?
1) It increases with increased trituration time.
2) It decreases with increased trituration time.
3) It is not affected by trituration time.
4) It is greatest at normal trituration time.
The typical mixing ratio for zinc polycarboxylate cement is 1:2 (powder to liquid).
What is the typical mixing ratio for zinc polycarboxylate cement?
1) 1:1
2) 1:2
3) 2:1
4) 3:1
Zinc polycarboxylate cement is favored as a luting agent for its chemical bonding capability with tooth structure.
What is the primary reason for using zinc polycarboxylate cement as a luting agent?
1) Its high compressive strength
2) Its ability to bond chemically to tooth structure
3) Its ease of manipulation
4) Its insolubility in oral fluids
?: Ag3Sn, ?: Cu3Sn8, ?: Cu3Sn
What are the stoichiometric formulas for the gamma (?), epsilon (?), and zeta (?) phases in dental amalgams?
1) ?: Ag3Sn, ?: Cu3Sn8, ?: Cu3Sn
2) ?: Ag3Sn, ?: AgSn, ?: CuSn
3) ?: AgSn, ?: Cu3Sn, ?: Ag3Sn8
4) ?: AgSn, ?: CuSn, ?: Ag3Sn.
It is not advisable to fill the crown completely with cement due to following 4 reasons:
1. the time for removal of excess cement elevates.
2. the risk for bubble entrapment increases
3. increased pressure may be needed
4. the time for seating increases
During crown cementation, complete filling of crown with cement is not advisable due to :
1) Increased risk of bubble entrapment
2) Increased seating time
3) Increased pressure required for seating crown
4) All of the above
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