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48 Cards in this Set
- Front
- Back
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The feeling among endodontists today is that all teeth receiving endodontic therapy need full coverage crowns to be adequately restored.
A. True B. False |
B. False
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The wishes of the patient concerning improved esthetics does not justify the placement of a veneer or crown on a perfectly healthy and non-carious tooth.
A. True B. False |
B. False
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Retention and resistance are clearly definable and separate entities when it comes to crown preparation.
A. True B. False |
B. False
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The geometric form of the preparation is perhaps the most important of the factors under the operator's control which determines whether or not a restoration will remain cemented to its preparation.
A. True B. False |
A. True
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The weak resistance of a short, wide preparation can be enhanced by the addition of
A. Undercuts in the preparation B. Bonding agents to the cement C. Vertical grooves D. Horizontal grooves and ditches |
C. Vertical grooves
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All of the preparation components, walls, grooves, line angles must provide a path which allows the cast crown to be seated to its maximum extent on the tooth. This concept is referred to as
A. Path of insertion B. Resistance form C. Retention form D. Draw E. Torque |
D. Draw
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Path of insertion and draw are closely related. Path of insertion, however, is related to the influence of proximal teeth upon seating of the crown or bridge.
A. True B. False |
A. True
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The path of insertion for a posterior crown is always parallel to the long axis of the tooth.
A. True B. False |
B. False
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Depth cuts when doing a crown preparation are
A. A necessary step in crown preparation B. A convenient tool which helps in determining the amount of reduction C. The only technique whereby one can remove the appropriate amount of tooth structure D. Required on the “Crown Competency” |
B. A convenient tool which helps in determining the amount of reduction
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Which of the following crown preparation elements can be incorporated to increase resistance and retention?
A. Grooves B. Undercuts C. Box forms D. Increased parallelism E. Increased taper A. A, B, C B. B, E C. A, C, D D. C, D, E E. A, B, C, D, E |
C. A, C, D
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Some of the advantages to the use of partial veneer restorations are:
A. Improved esthetics over porcelain restorations B. EPT possible C. Easier to verify complete seating of the restoration D. Much of the margin is accessible to the dentist for finishing A. A, B, C B. B, C, D C. A, C, D D. A.B.D |
B. B, C, D
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Which of the following statements are true about PFM crowns?
A. They are the most esthetic restoration we have B. Strongest, longest lasting porcelain crown C. Most utilized crown in dentistry today D. Combination of porcelain for esthetics fused to a metal coping E. Metal copings have been high nobel, nobel or non-precious metals A. A, B, E B. A, C, D, E C. B, C, D D. B, C, D, E E. All of the above |
D. B, C, D, E
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From a laboratory standpoint, it is better to slightly under reduce the tooth than over reduce the preparation for a PFM crown.
A. True B. False |
B. False
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Esthetics of a PFM crown can be improved by
A. Taking accurate shades B. Substituting an all porcelain margin for the PFM margin C. Cutting back the metal at the margin 2-3 mm D. Having a critical eye for morphology and anatomy E. All of the above |
E. All of the above
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If an all porcelain margin is desired on a PFM crown, slight variations in the preparation are necessary to accommodate that feature.
A. True B. False |
A. True
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Some practitioners advocate the use of a beveled shoulder margin for PFM crowns. The beveled shoulder margin is more esthetic than a chamfer PFM margin.
A. True B. False |
B. False
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The reason for reducing the facial surface of a PFM or all ceramic crown preparation on a maxillary incisor in two planes is to
A. Allow sufficient porcelain depth B. Make the prep look like the natural tooth C. Prevent undercuts D. Provided adequate clearance for proper occlusion |
A. Allow sufficient porcelain depth
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Relating to color or shades when taking a tooth shade, value relates to
A. The name of the color B. The relative blackness or whiteness of a color - lightness/brightness C. The concentration or strength of the hue D. None of the above |
B. The relative blackness or whiteness of a color - lightness/brightness
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A 45 year old female comes into the office wanting to do something with the space in her lower teeth. It is determined that she had #19 extracted about 20 years ago and now she reports that she thinks the remaining teeth are moving. The dentist diagnoses and treatment plans a three unit bridge - 18-19-20. The dentist should do the following:
A. Perform a careful occlusal analysis including mounting study casts B. Consider the possible need for crowning super-erupted teeth in the opposing arch C. Re-establish the occlusal plane D. Prep the bridge and take an impression with a triple tray E. Present the possibility of placing an implant in site #19 if anatomically feasible A. A, B, E B. A, B, C, D, E C. B, D, E D. A, B, C, E E. B, C, D, E |
D. A, B, C, E
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A 32 year old male comes in the office with #’s 30, 31 and 32 missing. The remaining dentition is in fairly good condition and needs only a few small restorations. He wants to replace the missing teeth on the lower right. His oral hygiene is fair to good. Periodontally he shows shows mostly 2-3 mm pockets with an occasional 4 mm pocket on his maxillary molars. He smokes and his physician has told him that he is borderline diabetic. The dentist treatment plans an implant replacing tooth #31 to be used an abutment for a 3 unit bridge 29-30-31. This is a reasonable course of treatment.
A. True B. False |
B. False
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While preparing tooth #6 as a PFM abutment for a 3-unit bridge the dentist “nicks” the pulp chamber . The mechanical exposure is less than .5mm in diameter and the dentist places a direct pulp cap and continues with the bridge preparation. The dentist should
A. Inform the patient about the exposure B. Schedule the patient for endodontic therapy C. Say nothing and if the tooth remains asymptomatic, cement the bridge D. Document carefully in the chart notes the occurrence and recommendations A. A, B B. C C. C, D D. A, B, D E. A, D |
D. A, B, D
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Ideally speaking, the crown to root ratio for an abutment should be 2:3. In some instances 1:1 or less may be permissible. Some additional factors to consider when evaluating a tooth as a bridge abutment are:
A. Size of pulp space B. Opposing occlusion C. Mobility D. Root configuration E. Intrinsic staining A. A, C, E B. A, C, D C. B, D, E D. B, C, D E. C, D, E |
D. B, C, D
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Any fixed prosthesis replacing more than two teeth (three or more pontics supported with two abutments) should be considered a high risk prosthesis.
A. True B. False |
A. True
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The following are factors to consider when planning a long span bridge.
A. Leverage B. Torque C. Rigidity D. Thickness of the pontic and connectors E. Length of the bridge F. Excessive loading of periodontal structures A. A, B, C B. C, D, E C. A, B, F D. All of the above E. None of the above |
D. All of the above
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Retainers on secondary abutments are placed in tension when the pontics flex and the primary abutments act as fulcrums. To counter these forces and prevent the secondary abutment retainers from “lifting”, grooves and box forms should be strategically placed. The best place for these grooves and box forms are on the mesial or distal axial walls of the primary abutment teeth.
A. True B. False |
B. False
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The path of insertion for a bridge that has a “tilted” abutment should be along the long axis of the most tilted abutment.
A. True B. False |
False
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If a temporary (provisional) restoration comes off prior to the cementing appointment, which of the following provisional criteria require that the patient is appointed as soon as possible to re-cement the provisional?
A. Pulpal protection B. Positional stability C. Occlusal function D. Maintains periodontal health E. Strength and retention F. Esthetics A. A, B B. A, B, D C. A, B, D, F D. E E. F |
B. A, B, D
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The custom provisional restoration has the potential of fulfilling all of the requirements of provisional fabrication - but it also has the potential of being as inferior as any of the other types of provisionals. Success is material dependent.
A. True B. False |
B. False
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What characteristic of custom provisional materials dictates that one does not allow the material to final set on the tooth?
A. Flow B. Tensil strength C. Shrinkage D. Snap set E. All of the above |
C. Shrinkage
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Concerning provisional restorations, it is permitted to relieve the interior of the crown so that it can be seated and removed with ease prior to cementation.
A. True B. False |
A. True
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The only reason for constructing a custom impression tray is when a pre-fabricated or stock tray will not suffice.
A. True B. False |
A. True
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Generally speaking, the maxillary alginate impression is taken with the operator standing behind and to the side of the patient. The mandibular impression is taken from in front and to the side of the patient. The main reasons for these positions is better vision and lip control.
A. True B. False |
A. True
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Alginate impressions should be held in place, passively, by the doctor or assistant for how long before removing from the mouth?
A. A total of 3 minutes after inserting in the mouth B. One minute after the gel stage has begun C. 2 minutes after the gel stage has begun D. 3 minutes after the gel stage has begun E. 4 minutes after placing the alginate in the tray |
C. 2 minutes after the gel stage has begun
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A perfect study cast or die begins with
A. Taking the perfect impression B. The type of impression material used C. The type of stone used D. Careful trimming and finishing of the stone models E. A stock tray |
A. Taking the perfect impression
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It is necessary to trim study casts properly in order to diagnosis a case correctly.
A. True B. False |
B. False
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All of the following factors are important in helping to take an accurate shade for a porcelain crown. However, if you were to prioritize the items, which one would come first?
A. Use a color corrected light source or natural light B. Make the selection a “team” process C. Use the shade guide your lab uses D. Take the shade before administering anesthetic |
A. Use a color corrected light source or natural light
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Dr. Richards recommends a “two cord” retraction cord system when taking impressions for fixed prosthetics. If epinephrine is used with the cords great caution should be taken, particularly with hypertensive patients. If the maximum dosage for epinephrine is 0.2 mg for a healthy person, it is estimated that by using an epinephrinized cord a patient could possibly absorb as much epinephrine as is in 100 carpules of 1:100,000 anesthetic.
A. True B. False |
A. True
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It is never necessary to use hemostatic agent on retraction cord if electrosurgery is used.
A. True B. False |
B. False
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If the margins of a provisional restoration are not perfect the following may occur.
A. Gingival inflammation B. Floss catching and shredding C. Floss catching and pulling off temp D. Debris accumulation E. All of the above |
E. All of the above
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It is impossible to separate the individual elements of crown preparation, impression, die preparation and the final restoration. Each step has its critical elements and if the dentist does not pay careful attention to each, the final restoration is at risk for failure
A. True B. False |
A. True
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The most common symptom of biologic width infringement is bone loss.
A. True B. False |
B. False
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While it is necessary to start a casting project with a good wax pattern, proper heating of the gold is the one thing which guarantees a good casting and a satisfactory final restoration.
A. True B. False |
B. False
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The glass ionomer and resin modified glass ionomer cements are categorized as
A. Luting cements B. Bonding cements |
A. Luting cements
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Of the three cement types - glass ionomer (GI), RMGI (RRGI), and composite resin - only one can be used for all types of fixed prosthesis and materials. That one is RMGI.
A. True B. False |
B. False
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Since temporary cements are to be used for temporary situations, they should never be used with permanent crowns and/or bridges.
A. True B. False |
B. False
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No cement compatible with living tooth structure and the environment of the oral cavity posses the adhesive properties required to hold a restoration in place.
A. True B. False |
A. True
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Lab prescriptions are general designed by the individual laboratories. Therefore, they are not considered part of the patient’s record and it is not necessary to keep copies for the record.
A. True B. False |
B. False
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When doing a crown preparation on a tooth that has old restorations and caries, it is not necessary to remove all of the old restorations.
A. True B. False |
B. False
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