MDS PREP
What does ORMOCER stand for in dental materials?
1) Organically Modified Resin Monomer Ceramic
2) Organically Modified Resin Matrix Composite
3) Organically Modified Ceramic Resin
4) Ormocer is not an acronym.
ORMOCER stands for Organically Modified Ceramic, which is a type of advanced filling material that combines the properties of ceramics and resins for superior performance in dental restorations.
What is the typical mixing time for temporary cementing materials?
1) 1-5 minutes
2) 5-15 minutes
3) 15-30 minutes
4) 1-15 minutes
The text does not specify the exact mixing time for temporary cements, but it states that the mixing time for all three varieties is approximately 1-15 minutes.
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.
Compressive and tensile strengths of spherical alloys are greatest at normal trituration time.
What does ORMOCER stand for in the context of dental filling materials?
1) Organically Modified Resin-ceramic Opportunistic
2) Organically Modified Resin-ceramic Material
3) Organically Modified Ceramic
4) Optimized Resin-ceramic Matrix
ORMOCER stands for Organically Modified Ceramic. These materials are advanced filling options in dentistry with a unique matrix technology and filler particles that result in high biocompatibility and aesthetics.
What is the dough-forming time for denture base resin according to ANSI/ADA Specification No. 12?
1) Less than 10 minutes
2) Less than 5 minutes
3) Less than 20 minutes
4) Less than 30 minutes
ANSI/ADA Specification No. 12 requires that the material should reach a doughlike consistency in less than 10 minutes from the start of the mixing process.
Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is:
1) Molybdenum
2) Germanium
3) Titanium
4) Chromium
Dental Materials Answer: 3
Fabrication of ceramics and metals like titanium that are difficult to cast, is done by CAD-CAM process and copy milling.
What is the elastic limit of a wire?
1) The point at which the wire returns to its original shape.
2) The point at which the wire starts to weaken.
3) The point at which the wire yields permanently.
4) The point at which the wire breaks.
The elastic limit of a wire is the point at which it yields permanently, meaning any greater force applied will result in irreversible deformation.
What is the optimal force applied during condensation of a 1 mm diameter condenser nib?
1) 3.75 pounds
2) 8.43 pounds
3) 15 pounds
4) 0.04-0.4 µm
The optimal force for condensing a composite resin using a 1 mm diameter condenser nib is 15 pounds, which is within the physiologic limits of the tooth and provides effective condensation.