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brain in dds

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Hey Friends,

i'm starting this new thread only limited to Released Qs released by NDEB of Canada. They 660 pages looooooooooooooong!
So, another platform for all EE students to dance on and get each other's help in getting the right answer! :clap:

Good Luck!
 
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which of the following is most likely to initiate a hypersensitivity reaction?

a. titanium
b. gold
c. Nickel chromium
d. chrome cobalt
e. silver amalgam
 
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brain in dds said:
which of the following is most likely to initiate a hypersensitivity reaction?

a. titanium
b. gold
c. Nickel chromium
d. chrome cobalt
e. silver amalgam
Click to expand...


not absolutely sure but I would go for nickel chromium
 
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The presence of nickel is of greater importance
because it is a known allergen. The incidence
of allergic sensitivity to nickel has been
reported to be from 5 to 10 times higher for
females than for males, with​
​
​
​
5% to 8% of females
showing sensitivity. However, no correlation
has been found between the presence of intraoral
nickel-based restorations and sensitivity. A
cobalt-chromium alloy without nickel or other
non-nickel containing alloy should be used on
patients with a medical history indicating an​

allergic response to nickel.
Sarna said:
I don't have any reference, but nickel is highly allergenic.
Click to expand...
 
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ok, now the dental material book says tht less than 1% of the amalgam treated population experienced the type IV hypersensitivity. 😴


brain in dds said:
The presence of nickel is of greater importance​

because it is a known allergen. The incidence
of allergic sensitivity to nickel has been
reported to be from 5 to 10 times higher for​

females than for males, with
5% to 8% of females
showing sensitivity. However, no correlation
has been found between the presence of intraoral
nickel-based restorations and sensitivity. A
cobalt-chromium alloy without nickel or other
non-nickel containing alloy should be used on
patients with a medical history indicating an​
allergic response to nickel.
​
Click to expand...


​
 
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ok... i m confused enough to come up with this conclusion 😕😕 tht i'll go with nickel chromium as one of its constituent beryllium also produces contact dermatitis!!!

do confirm this plz. 😴😴

brain in dds said:
ok, now the dental material book says tht less than 1% of the amalgam treated population experienced the type IV hypersensitivity.




[/LEFT]
Click to expand...
 
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Less than 1% (amalgam)is less than 8% in women(nickel), so nickel is the most likely to initiate the reaction. Why are you confused?
 
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thnx sarna!
actually i read frm skinners, saunders, and other articles frm prosthodontics journals, which i couldnt copy n paste here n it was waay tooo much to write it here... so i just wrote the main point. i was in a half sleep... i was confused with nickel chromium n cobalt chr....

but now i m actually wide awake an active enough to go with nickel.
just coz i needed some referrance!


Sarna said:
Less than 1% (amalgam)is less than 8% in women(nickel), so nickel is the most likely to initiate the reaction. Why are you confused?
Click to expand...
 
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Which of the following physical properties
would be_least_important for an impression
material for partially edentulous patients?

A. Biocompatibility.
B. Dimensional stability.
C. Ease of manipulation.
D. Adhesion to calcium.
E. Elasticity. .
 
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Diagnostic casts for a fixed bridge allow the
dentist to

A. visualize the direction of the forces.
B. assess occlusion more accurately.
C. plan the pontic design.
D. All of the above. .
 
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Diagnostic casts for a fixed bridge allow the
dentist to

A. visualize the direction of the forces.
B. assess occlusion more accurately.
C. plan the pontic design.
D. All of the above. .

I'd say D.

For composite resin preparations, cavosurface enamel margins are bevelled bacause:
1- a bevelled margin produces a more favorable surface for etching
2- a bevelled margin improves the edge strength of a composite resin
3- after etching the bonding agent reduces microleakage
4- the procedure eliminates the need to polish the restoration

A- 1,2 and 3
B- 1 and 3
C- 2 and 4
D- 4 only
E- all of the above

is it A or B???
I found literature confirming 1.
I could not find anything about 2.
4 is wrong for sure.
 
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Hi
sarna said:
which of the following physical properties
would be_least_important for an impression
material for partially edentulous patients?

A. Biocompatibility.
B. Dimensional stability.
C. Ease of manipulation.
D. Adhesion to calcium. -------answer
e. Elasticity. .
Click to expand...
 
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Sarna said:
Which of the following physical properties
would be_least_important for an impression
material for partially edentulous patients?

A. Biocompatibility.
B. Dimensional stability.
C. Ease of manipulation.
D. Adhesion to calcium.
E. Elasticity. .
Click to expand...

D, adhesion to calcium...you don't want the mucosa surfaced denture base reproduced incorrectly which is the case if the imopression material adhered to the calcium of the model...
 
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Sarna said:
Diagnostic casts for a fixed bridge allow the
dentist to

A. visualize the direction of the forces.
B. assess occlusion more accurately.
C. plan the pontic design.
D. All of the above. .
Click to expand...

D, all of above
 
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For composite resin preparations, cavosurface enamel margins are bevelled bacause:
1- a bevelled margin produces a more favorable surface for etching
2- a bevelled margin improves the edge strength of a composite resin
3- after etching the bonding agent reduces microleakage
4- the procedure eliminates the need to polish the restoration

1 and 3 are true.... I don't think the edge strength of the composite resins improves with bevelling...
 
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For composite resin preparations, cavosurface enamel margins are bevelled bacause:
1- a bevelled margin produces a more favorable surface for etching
2- a bevelled margin improves the edge strength of a composite resin
3- after etching the bonding agent reduces microleakage
4- the procedure eliminates the need to polish the restoration

Ans 1 & 3
 
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The higher modulus of elasticity of a chromium-cobalt-nickel alloy, compared to a type IV gold alloy, means that ch-co-ni partial denture clasps will require

A. a heavier cross section for a clasp arm
B. a shorter retentive arm
C. more taper
D. a shallower undercut
 
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ans . a shallower undercut



skywriter80 said:
The higher modulus of elasticity of a chromium-cobalt-nickel alloy, compared to a type IV gold alloy, means that ch-co-ni partial denture clasps will require

A. a heavier cross section for a clasp arm
B. a shorter retentive arm
C. more taper
D. a shallower undercut
Click to expand...
 
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leda said:
D, adhesion to calcium...you don't want the mucosa surfaced denture base reproduced incorrectly which is the case if the imopression material adhered to the calcium of the model...
Click to expand...

I do not understand this. You probably never want the material to adhere to the model.. 😕
 
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skywriter80 said:
The higher modulus of elasticity of a chromium-cobalt-nickel alloy, compared to a type IV gold alloy, means that ch-co-ni partial denture clasps will require

A. a heavier cross section for a clasp arm
B. a shorter retentive arm
C. more taper
D. a shallower undercut
Click to expand...

a shallower undercut
 
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skywriter80 said:
for composite resin preparations, cavosurface enamel margins are bevelled bacause:
1- a bevelled margin produces a more favorable surface for etching
2- a bevelled margin improves the edge strength of a composite resin
3- after etching the bonding agent reduces microleakage
4- the procedure eliminates the need to polish the restoration

ans 1 & 3
Click to expand...

agree
 
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Crown-root ratio and residual bone support
can best be seen radiographically in

A. a panoramic film.
B. a bite-wing film.
C. a periapical film - bisecting angle
technique.
D. a periapical film - paralleling
technique.



Root canal therapy may be safely and
successfully undertaken for

1. hemophiliacs.
2. patients with a history of rheumatic fever.
3. patients with rheumatoid arthritis.
4. cerebral palsy patients.
5. adolescent diabetics.


A. (2) (3) (4)
B. (2) (3) (5)
C. (1) (2) (3) (5)
D. All of the above.
E. None of the above. .
 
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Sarna said:
Crown-root ratio and residual bone support
can best be seen radiographically in

A. a panoramic film.
B. a bite-wing film.
C. a periapical film - bisecting angle
technique.
D. a periapical film - paralleling
technique. :xf:




Root canal therapy may be safely and
successfully undertaken for

1. hemophiliacs.
2. patients with a history of rheumatic fever.
3. patients with rheumatoid arthritis.
4. cerebral palsy patients.
5. adolescent diabetics.


A. (2) (3) (4)
B. (2) (3) (5) 👍
C. (1) (2) (3) (5)
D. All of the above.
E. None of the above. .
Click to expand...

correct me if I m wrong
 
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dralana1977 said:
Diagnostic casts for a fixed bridge allow the
dentist to

A. visualize the direction of the forces.
B. assess occlusion more accurately.
C. plan the pontic design.
D. All of the above. .

I'd say D.

For composite resin preparations, cavosurface enamel margins are bevelled bacause:
1- a bevelled margin produces a more favorable surface for etching
2- a bevelled margin improves the edge strength of a composite resin
3- after etching the bonding agent reduces microleakage
4- the procedure eliminates the need to polish the restoration

A- 1,2 and 3
B- 1 and 3
C- 2 and 4
D- 4 only
E- all of the above

is it A or B???
I found literature confirming 1.
I could not find anything about 2.
4 is wrong for sure.
Click to expand...

Ref frm Surdevant's:
Other advantages of beveling composites are as
follows:
(1) Adjacent, minor defects can be included with a bevel,
(2) esthetic quality may be enhanced by a bevel creating an area of gradual increase in composite thickness from the margin to the bulk of the restoration, and
(3) the marginal seal may be enhanced.

DO CORRECT ME IF I M WRONG, PLZ!​
 
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Root canal therapy may be safely and
successfully undertaken for

1. hemophiliacs.
2. patients with a history of rheumatic fever.
3. patients with rheumatoid arthritis.
4. cerebral palsy patients.
5. adolescent diabetics.


A. (2) (3) (4)
B. (2) (3) (5)
C. (1) (2) (3) (5)
D. All of the above.
E. None of the above.

According to D Decks:
"A medical condition such as hemophilia is not a contraindication to conventional endodontic therapy. However, it is strongly recommended that a dentist obtain clearance from the patient's physician prior to treatment"

I am not sure if 4 is right...
C or D
 
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brain in dds said:
Ref frm Surdevant's:
Other advantages of beveling composites are as
follows:
(1) Adjacent, minor defects can be included with a bevel,
(2) esthetic quality may be enhanced by a bevel creating an area of gradual increase in composite thickness from the margin to the bulk of the restoration, and
(3) the marginal seal may be enhanced.

DO CORRECT ME IF I M WRONG, PLZ!​
Click to expand...

To create increase in edge strength the cavity should have 90 degree margin so I guess bevelling doen not increase edge strength

Anybody else has different opinion pls share
 
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Root canal therapy may be safely and
successfully undertaken for

1. hemophiliacs.
2. patients with a history of rheumatic fever.
3. patients with rheumatoid arthritis.
4. cerebral palsy patients.
5. adolescent diabetics.


A. (2) (3) (4)
B. (2) (3) (5)
C. (1) (2) (3) (5)
D. All of the above.
E. None of the above. .

I don't see how can cerebral palsy be a contraindication to canal therapy...uncontrolled type I diabetes is contraindication to canal therapy.

I would choose A (2) (3) (4)
 
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the answer for composite and bevels shud be 1 & 3 becoz bevel will not increase edge strength infact if you read it in Summit it says in areas with high occlusal loads bevels are contraindicated in composites ,this means they reduce the edge strength.In practice I see they never give bevels in prep for composite unless it is to get retention for anterior teeth.

now for the ENdo question I think it shoud be all of the above becoz hemophiliacs can tolerate endo procedures without any problems have witnessed it in a clinic,Also cerebral palsy pts can be treated in for endo too,the question is very generalised it syas if endo can be performed ont hem,i thinkit can be they haven't even mentioned if it is in a hospital setting or clinic.Hence i wud say all of the above,they do not say anything abt the diabetes being uncontrolled.
 
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agree with dent rdh......unless if it was stated uncontrolled hemophilia...n same case wid cerebral palsy....dey havnt mentioned which type n its severity.....
 
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leda said:
D, adhesion to calcium...you don't want the mucosa surfaced denture base reproduced incorrectly which is the case if the imopression material adhered to the calcium of the model...
Click to expand...

Leda, do you have any reference regarding this matter?

As for the root canal therapy I thought all of the above as well, because the question is very general. But I don't really know what intension was behind this question.
Pt with rheumatic fever may have valvular dysfunction which may req antibiotics, diabetes may be uncontrolled, hemopholiacs may req. mandibular block for endo and then they will need factor augmentation etc... But my first thought was all of the above.
 
Last edited:
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Which of the following factors cud cause a casting to fit tighter in the mouth than on the cast?

A. too much h20 in mixing the stone for the cast
B. too little h20 in mixing the stone for the cast
C. duplication impression slightly oversized
D. improper waxup of the partial

ans wid explanation plz..thanx
 
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Sarna said:
Leda, do you have any reference regarding this matter?

As for the root canal therapy I thought all of the above as well, because the question is very general. But I don't really know what intension was behind this question.
Pt with rheumatic fever may have valvular dysfunction which may req antibiotics, diabetes may be uncontrolled, hemopholiacs may req. mandibular block for endo and then they will need factor augmentation etc... But my first thought was all of the above.
Click to expand...


Sarna, I dont'have reference for the adhesion question, but I am pretty sure that if the impression material adheres to calcium the model will not reproduce correctly the mucosa surface ( the base of the denture).

As for the endo question, the root canal therapy may involve instrumentation beyond the apex or the rupture of neurovascular packet at the apex...therefore some hemorrhage is expected and hemophiliacs need the the respective factors and premedication...

adolescent diabetes is type I diabetes, the question does not specifiy that it is controlled so I am asuming it is not controlled, plus if no antibitics are given you can be sure that the patient will not develop any type of infection...
 
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skywriter80 said:
Which of the following factors cud cause a casting to fit tighter in the mouth than on the cast?

A. too much h20 in mixing the stone for the cast
B. too little h20 in mixing the stone for the cast
C. duplication impression slightly oversized
D. improper waxup of the partial

ans wid explanation plz..thanx
Click to expand...

I think A too much water in the stone for the cast....

too much water will decrease the setting expansion of the model, so in a kind of contracted model you will produce a casting that will not fit the mouth...
 
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leda said:
I think A too much water in the stone for the cast....

too much water will decrease the setting expansion of the model, so in a kind of contracted model you will produce a casting that will not fit the mouth...
Click to expand...
well a/c to applied dental material (McCacbe ed8 pg 33).... W/P ratio & mixing time hav only a minimal effect on setting expansion........

high W/P ratio ******s setting time.......

i think it will b D...but not sure
 
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dent rdh said:
here is a file for ur reference regarding hemophiliacs it is a WFH release on hemophiliacs talks abt endo therapy too and how it is a low risk procedure
www.wfh.org/2/docs/Publications/Dental.../TOH-40_Dental_treatment.pdf

i agree with the answer A for the mixing of stone cast
Click to expand...

can't open this link..

I am thinking now that the hemorrhage is insignificant in an endo procedure and maye it doesn't pose any serious risk... I might go for 1,2,3,4...only diabetes is unsafe...

what do you think ??
 
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dent rdh said:
here is a file for ur reference regarding hemophiliacs it is a WFH release on hemophiliacs talks abt endo therapy too and how it is a low risk procedure
www.wfh.org/2/docs/Publications/Dental.../TOH-40_Dental_treatment.pdf

i agree with the answer A for the mixing of stone cast
Click to expand...

I opened the link.... it says it is a low risk but not totally free of risk... instrumentation beyond apex or blood vessel rupture may occur and they should be avoided...

I am not sure...If I had a hemophiliac patient honestly I would require a clearance from his doctor... But for this quiz I don't know what are the authors referring to... Is there any American guideline on this..I checked ADA ..could not find anything...
 
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leda said:
I think A too much water in the stone for the cast....

too much water will decrease the setting expansion of the model, so in a kind of contracted model you will produce a casting that will not fit the mouth...
Click to expand...

I put B in this one. The casting is tighter in the mouth than on the cast- meaning the cast is bigger than the actual abutment . It is bigger - too much expansion occurred- because there was too little water.
Do you agree?
 
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In taking an impression with polysulfide or
silicone materials, if the heavy bodied tray
material begins to set before seating, the
resultant die will

A. not be affected dimensionally.
B. be overall smaller.
C. be overall larger.
D. develop a rough surface texture.
E. develop bubbles at the interface of
the syringe and tray material.
 
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Sarna said:
I put B in this one. The casting is tighter in the mouth than on the cast- meaning the cast is bigger than the actual abutment . It is bigger - too much expansion occurred- because there was too little water.
Do you agree?
Click to expand...

agree, Sarna...silly me...it is like a game of words...very confusing...
 
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Sarna said:
I put B in this one. The casting is tighter in the mouth than on the cast- meaning the cast is bigger than the actual abutment . It is bigger - too much expansion occurred- because there was too little water.
Do you agree?
Click to expand...

actually I was right Sarna...it is A...if the cast is tighter in the mouth it means that the model (die) is smaller than the actual abutment...
 
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