The path of insertion, or line or draw, is determined:
before the preparation is begun.
After equilibrating the typodont & marking the equilibrated teeth, the teeth should never be used for preparation:
true; if a tooth is damaged & must be replaced, equilibrate it!
Which of the following is considered an extracoronal restoration?
Which of the following is the 1st step in a full crown preparation?
All the following contribute to the retention & resistance of the crown, the finish line at the gingival margin, taper of the axial walls, the length of the axial walls, & grooves or boxes in the axial wall
finish line at the gingival margin
The essential element of a cemented restoration is opposing vertical walls, that may be either external or internal:
The following are indications for a full gold crown except:
none of the above (endodontically-treated teeth, teeth that require recontouring, teeth requiring maximal retention, partial denture abutments)
Inadequate occlusal clearance in a full gold crown prep will lead to:
thin occlusal crown
Knife-edge finish line is not recommended for a FGC preparation, because:
it will result in overcontour
A FGC can be done for a pt w uncontrolled caries, bc of its resistance to recurrent caries:
The ideal taper relationship of opposing axial walls is:
6-10 degrees taper towards the occlusal
After a maxillary molar full crown prep is completed, the ML cusp will be abt 2/3rds of the mesial-distal width:
A properly-made provisional restoration should: protect the pulp from temperature sensitivity, prevent leakage of the saliva at the margin, provide occlusal function, ward off tooth migration, & promote healthy gingiva formation:
When making a provisional restoration, the impression of the prepared tooth is made with ______ & the impression is poured up with ________:
alginate, quick-setting plaster
When making an indirect provisional restoration, after trimming the prepared cast of a tooth, how many teeth should remain on each side of the tooth?
For the indirect acrylic technique, you need to either have an overimpression of the unprepared tooth, or a stent prepared from a cast of the unprepared tooth:
In making a provisional restoration, if occlusal blebs on unprepared teeth adjacent to a prepared tooth in the cast are not removed, what will be the result?
occlusion will be too high
If there is not adequate axial reduction for a PFM restoration, which is not likely to be a result?
resistance & retention of the crown
When preparing a tooth for a PFM restoration, if there is a shoulder without a bevel, a full-ceramic margin can be made:
The angle formed btw the shoulder & the base of an axial wall should be sharp & distinct:
When prepping a max central incisor for a PFM restoration, how much tooth structure should be removed from the incisal edge?
When doing an anterior PFM preparation, when should the location of the facial line be determined?
before the preparation
Post metal crowns often have porcelain occlusal surfaces for max esthetics. How much more abrasive is glazed porcelain compared to gold?
How much occlusal clearance is needed on occlusal surfaces that will be covered w porcelain?
On highly-visible posterior teeth, an all ceramic margin is often used, w a shoulder on the facial surface. How wide should the shoulder be?
1.0 mm; our range is 1.0-1.2mm
If there is inadequate facial reduction, the resulting PFM restoration will either be opaque or over-contoured:
The porcelain layer immediately over the metal coping in a metal-ceramic crown is called:
the opaque layer (used to mask the metal)
While it is important to determine the line of draw at the beginning of a full crown preparation, it is not necessary to do this before a metal-ceramic preparation:
In a posterior PFM prep, the angle of the base of the facial wall & shoulder should be _____, and the angle formed at the junction of the shoulder & the uncut tooth structure should be a(n) ______ angle:
The clearance for the functional cusp bevel should be ______ if the coverage is metal, and _________ if it will be veneered w ceramic:
The functional cusp bevel is a critical component of occlusal clearance in any crown prep:
In a partial veneer preparation, there are sharp & distinct internal angles, and smooth & flowing finish lines:
In a 7/8ths crown preparation, the following cusp is left untouched:
A 7/8ths crown preparation utilizes grooves on which two surfaces?
mesial & buccal
While a 7/8ths crown preparation can be used on any posterior tooth, it is most commonly used on:
The ideal occlusal clearance on the MB cusp of a 7/8ths crown prep on a max molar should be 1.0 mm:
In a 7/8ths crown prep on a max molar, the inclination from cusp tip to the central groove should be the steepest on:
the MB cusp
After a FGC prep is finished on a max 1st molar, the mesial-distal dimension of the cusps should be:
MB ½, DB ½, ML 2/3, DL 1/3
Failure to place the functional cusp bevel can lead to a casting that:
is thin, & has poor morphology
A provisional restoration that impinges on the gingival tissue can lead to all of the following except:
none of the above (gingival inflammation, gingival proliferation, gingival recession, & hemorrhage upon impression or cementation can all occur)
Which of the following is not an intracoronal restoration?
Simple or complex amalgam
Full gold crown
The most important aspect of retention is the length of two parallel opposing walls. These can be internal or external.
What are the functional cusps of the teeth?
Buccal on the maxillary, buccal on the mandibular
Lingual on the maxillary, lingual on the mandibular
Lingual on the maxillary, buccal on the mandibular
Buccal on the maxillary, lingual on the mandibular
lingual max, buccal mand
When should you do the line of draw?
Before you begin the preparation
During the axial reduction
Before you polish
After you have equilibrated your typodont, you should not use the teeth you marked for equilibration.
What is the best finish line?
Doing a bevel on the funcional cusp is necessary?
What is the most important component of retention and resistance?
Having a longer axial wall adds additional retention
Which of the following is not an aspect of retention
Functional cusp bevel
On a maxillary full crown prep, the distal lingual cusp should make up 2/3 of the mesial, distal length.
The ideal length opposing axial walls for a full crown prep should be a minimum of:
A temporary can prevent tooth sensitivity, prevent tooth movement, and protect the gingival tissues.
A temporary that is putting pressure on the gingiva can cause all of the following except:
Hemoragging while taking an impression
None of the above
Use an overimpression of the cast after the cast has been corrected with wax – if a piece of tooth is missing and youre trying to make a crown.
Maxillary full gold crown – mesiolingual cusp will be about ___ of total mesio-distal width
Minimum axial wall length
Provisional restoration that impinges on gingiva can cause:
gingival inflammation, proliferation (swelling), recession and hemorrhaging during cementing.
The best finish line for a full gold crown is a
The functional cusp bevel is an essential part of occlusal reduction.
The purpose of an axial wall is for retention and resistance.
True: Occlusal reduction is done first.
To enhance retention, the following can be placed:
pin holes, groove, proximal box
The finish line design is determined before the beginning of the preparation.
The purpose for the incisal reduction is for lingual clearance.
The posterior teeth that are located in the appearance zones when you smile are:
max first molars, max premolars, and mand premolars.
Glazed dental porcelain is ___ more abrasive than enamel.
The facial finish line design with minimal esthetics is a
In a PFM of an maxillary anterior, the incisal surface is prepped first.
The finish line on the ceramic surface is a:
shoulder. (beveled shoulder is for the metal collar)
If you have inadequate reduction, the final restoration will appear:
The best method to ensure proper pulp protection is the:
Quick-set plaster cast has bubble on 29 when you’re working on 30, if bubble is not removed, it will be out of occlusion.
FALSE (too high, too much occlusion)
Flare forms an ____ angle with the axial wall
Partial veneer gold crowns have sharp and well-defined internal line angles and smooth flowing external line angles.
7/8 crowns are often performed on :
7/8 crowns covers all exterior walls except:
¾ crown can utilize the proximal box to replace grooves.
Occlusal clearance for MB cusp is
1.0mm, lingual to offset
In terms of retention grooves, buccal grooves are placed first because it is easier
Non-functional cusp bevel is part of the occlusal clearance
In FGC prep on the maxillary molar, the proportions of occlusal table are:
MB and DB ½, ML 2/3, DL 1/3
Provisional restorations that impinge on the gingiva can cause:
gingival proliferation, hemorrhage, or gingival recession.