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Which wall of the proximal groove is for added retention and resistance in a ¾ crown prep?
lingual wall
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Which wall is left unprepared in a ¾ max molar prep?
buccal wall
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The part that adds strength to the buccal margin is called the
offset
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-the purpose of placing the offset is
provide the bulk of gold near the finish line
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the buccal extension of the mesial flare should be ____ the buccal extension of the distal flare
less than
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the occlusal reduction of the buccal cusp on a ¾ maxillary crown prep should be ______
1.0 mm, measured lingual to the offset
-
the func cusp bevel forms a ____ angle to the line of draw
45 degree
-
it is recommended to place the mesial groove first in a molar, and place the distal groove first in a premolar
false
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for a maxillary ¾ crown prep, the non-functional cusp bevel is ____ , used for the purpose of _______
0.2-0.3 mm, for smoothening the enamel rods
-
for a maxillary ¾ crown prep, the lingual wall of the grooves should taper to the occlusal, the same way that a buccal wall of the FGC prep would
true
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you should use a rubber dam when preparing a gold inlay
true
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internal walls of the gold inlay prep should taper _____
6-10 degrees
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the finish line for the interproximal box of the gold inlay should be a _____
beveled shoulder
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Contraindications for placing an MOD gold inlay include all the following except
replacing failed restorations
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The order of sequence for preparing an MOD gold inlay is
occlusal outline, proximal box, refine line angles, gingival bevel, finishing occlusal bevel
-
If you plan to do an MOD gold onlay, it’s recommended to prepare the MOD inlay first
true
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You should do an MOD onlay during what step?
after doing the occlusal outline and proximal boxes
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The shoulder and bevel should be placed on what cusp, for an MOD onlay?
buccal of mandibular, and lingual of maxillary (ie, the functional cusp)
-
-after mixing the light body material, how soon can the impression be removed?
5 min
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-an impression that includes the finish line, but not any uncut tooth structure around the finish line, would be ideal
false
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-what bur should you use to trim the area apical to the finish line on a die stone cast
pear shaped acrylic bur (NOTE: he’s giving everyone credit for this question b/c he didn’t really include this answer in the answer choices)
-
-the dye spacer is placed on the cast for what reason?
to make space for cement (got this wrong)
-
-the minimum number of pins that you can place in a pindex tooth is ___
2
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How thick should the base be trimmed to, when preparing a jade stone cast for pindexing?
15-20 mm
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How many microns thick should the die spacer be, ideally?
20-40 microns thick (got this wrong)
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The functional cusp bevel for a FGC prep should be placed on which of the following?
buccal incline of buccal cusp of mandibular molars
-
The ideal tapering towards the occlusal of each axial wall should be 3-5 degrees with the line of draw
true
-
A provisional that impinges on the gingiva can cause gingival irritation, bleeding, etc…
true
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