- Category: Operative Dentistry
- Aim: Revising for NBDE Part II
- Questions: 25
- Hint: No
- Mutiple Opportunites: No
- Time Limit: No
- Answer Explaining: Yes
Which of the following statements regarding caries risk assessment is correct?
The presence of restorations is a good indicator of current caries activity.
The presence of restorations is a good indicator of past caries activity.
The presence of dental plaque is a good indicator of current caries activity.
The presence of pit-and-fissure sealants is a good indicator of current caries activity.
Slots should be 1.5 mm in depth.
Slots should be 1 mm or more in length.
Slots may be segmented or continuous.
Slots should be placed at least 0.5 mm inside the DEJ.
More resistant to occlusal forces.
Not indicated for Class II restorations.
Reduction/elimination of food impaction at the interdental papilla.
Provide appropriate space for the interdental papilla.
Provide increased retention form for the restoration.
Maintenance of the proper occlusal relationship.
The outline form is usually kidney- or crescentshaped.
Because the mesial, distal, gingival, and incisal walls of the tooth preparation are perpendicular to the external tooth surface, they usually diverge facially.
Using four comer coves instead of two full-length grooves conserves dentin near the pulp and may reduce the possibility of a mechanical pulp exposure.
If the outline form approaches an existing proximal restoration, it is better to leave a thin section of tooth structure between the two restorations (< 1 mm) than to join the restorations.
When carving a Clam I amalgam restoration, which statement is false?
Carving may be made easier by waiting 1 or 2 minutes after condensation before it is started.
The blade of the discoid carver should move parallel to the margins resting totally on the partially set amalgam.
Do not carve deep occlusal anatomy.
The carved amalgam outline should coincide with the cavosurface margins.
- Occlusal convergence
- Occlusal bevel
- Retention grooves
2 and 4
1 and 3
1 and 4
2 and 3
Which one of the following acids is generally recommended for etching tooth structure?
Ethylenediaminetetraacetic acid (EDTA)
Which of the following statements about indirect pulp caps is false?
Some leathery caries may be left in the preparation.
A liner is generally recommended in the excavation.
The operator should wait at least 6 to 8 weeks before re-entry (if then).
The prognosis of indirect pulp cap treatment is poorer than that of direct pulp caps.
Temporary cement still on the prepared tooth after the temporary restoration has been removed.
Proximal contact(s) of casting too heavy/tight.
Undercuts present in prepared tooth.
The occlusal of the prepared tooth was underreduced.
Causing gingival inflammation.
All of the above.
Reduce the size of the alloy particles.
Coat the alloy particles with mercury.
Reduce the crystal sizes as they form.
Dissolve the alloy particles in mercury.
The use of the rubber dam is best indicated for .
Teeth with challenging preparations.
All of the above.
Facial and lingual surfaces.
Occlusal pits and grooves.
Mesial and distal surfaces.
A and C.
The enamel cavosurface margin angle must be 90 degrees.
The cavosurface margin should provide for a 90- degree amalgam margin.
All prepared walls should converge externally.
Retention form for Class Vs can be placed at the DEJ.
Establishing restored proximal contacts is easier with composite.
The amalgam is more difficult and technique- sensitive.
The composite generally uses a more conservative tooth/cavity preparation.
Amalgam should be used for Class II restorations.
Lack of adequate condensation, especially lateral condensation in the proximal boxes.
Extension onto the root surface.
Lack of dentinal sealing.
Dissolution of the entire alloy particle into mercury.
Dissolution of the Cu from the particles into mercury.
Precipitation of Sn-Hg crystals.
Mercury reaction with Ag on or in the alloy particle.
Tooth is symptomatic.
Deeply notched axially.
Many factors affect tooth/cavity preparation. Which of the following would be the least important factor?
Extent of the defect.
Size of the tooth.
Extent of the old material.
The time necessary to apply the material(s).
The amount of smear layer removed.
The bond strengths to enamel.
The need for wet bonding.
For a dental hand instrument with a formula of 10-8.5-8-14, the number 10 refers to .
The width of the blade in tenths of a millimeter.
The primary cutting edge angle in centigrades.
The blade length in millimeters.
The blade angle in centigrades.
Inability to isolate the operating area.
Extension onto the root surface.
Class I restoration with a high C-factor.
When placement of proximal retention locks in Class II amalgam preparations is necessary, which of the following is incorrect?
One should not undermine the proximal enamel.
One should not prepare locks entirely in axial wall.
Even if deeper than ideal, one should use the axial wall as a guide for proximal lock placement.
One should place locks 0.2 mm inside the DEJ to ensure that the proximal enamel is not undermined.