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[gag]

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HI GUYS
i'm posting few of my doubts.plz help me choosing right answers

123. For a cast gold restoration, a gingival bevel is used
instead of a shoulder because a bevel
1. protects the enamel.
2. increases retention.
3. improves marginal adaptation.
4. increases the thickness of gold.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

does bevel leads to increase retention in this case?


140. Composite resin is CONTRAINDICATED as a
posterior restorative material in cases of
1. cusp replacement.
2. bruxism.
3. lack of enamel at the gingival cavosurface
margin.
4. inability to maintain a dry operating field.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above
IS E THE ANSWER?

120. Smooth surface caries begins at localized areas on
the
A. outer surface of enamel and dentin.
B. inner surface of the enamel.
C. outer surface of the dentin.
D. outer surface of the enamel.
E. inner surface of the dentin.

 

[civil]

HI GUYS
i'm posting few of my doubts.plz help me choosing right answers

123. For a cast gold restoration, a gingival bevel is used
instead of a shoulder because a bevel
1. protects the enamel.
2. increases retention.
3. improves marginal adaptation.
4. increases the thickness of gold.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

does bevel leads to increase retention in this case?


140. Composite resin is CONTRAINDICATED as a
posterior restorative material in cases of
1. cusp replacement.
2. bruxism.
3. lack of enamel at the gingival cavosurface
margin.
4. inability to maintain a dry operating field.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above
IS E THE ANSWER?

120. Smooth surface caries begins at localized areas on
the
A. outer surface of enamel and dentin.
B. inner surface of the enamel.
C. outer surface of the dentin.
D. outer surface of the enamel.
E. inner surface of the dentin.

123. For a cast gold restoration, a gingival bevel is used
instead of a shoulder because a bevel
1. protects the enamel.
2. increases retention.
3. improves marginal adaptation.
4. increases the thickness of gold.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

does bevel leads to increase retention in this case?

By giving gingival bevel, a lap sliding fit is produced at gingival margin. This helps improve fit of the casting in this region. So I think yes it increases retention as well, but I am not sure though....
Considering this, answer may be A... Is that correct???


140. Composite resin is CONTRAINDICATED as a
posterior restorative material in cases of
1. cusp replacement.
2. bruxism.
3. lack of enamel at the gingival cavosurface
margin.
4. inability to maintain a dry operating field.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above
IS E THE ANSWER?

Yes the answer is E.

120. Smooth surface caries begins at localized areas on
the
A. outer surface of enamel and dentin.
B. inner surface of the enamel.
C. outer surface of the dentin.
D. outer surface of the enamel.
E. inner surface of the dentin

Answer is D.

 

[toothie]

140. Composite resin is CONTRAINDICATED as a
posterior restorative material in cases of
1. cusp replacement.
2. bruxism.
3. lack of enamel at the gingival cavosurface
margin.
4. inability to maintain a dry operating field.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above
IS E THE ANSWER?

yup , e is definately the answer

120. Smooth surface caries begins at localized areas on
the
A. outer surface of enamel and dentin.
B. inner surface of the enamel.
C. outer surface of the dentin.
D. outer surface of the enamel.
E. inner surface of the dentin.[/QUOTE]

ANS: d

 

[treasure]

hi,
My query is why is composite contraindiated in the case of lack of enough enamel at cavosufrace margin....??
It would really appreciate if anyone could explain...
treasure.

 

[ahmead]

HI GUYS
i'm posting few of my doubts.plz help me choosing right answers

123. For a cast gold restoration, a gingival bevel is used
instead of a shoulder because a bevel
1. protects the enamel.
2. increases retention.
3. improves marginal adaptation.
4. increases the thickness of gold.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

does bevel leads to increase retention in this case?

bevel will increase the surface area and decrease the thickness of gold in the margin which will lead to increaseretention and incease the elongation of gold particles (better polishing and adaptation)

i think that, please correct me if im wrong 😉
best wishes
ahmad

 

[G.P]

HI GUYS
i'm posting few of my doubts.plz help me choosing right answers

123. For a cast gold restoration, a gingival bevel is used
instead of a shoulder because a bevel
1. protects the enamel.
2. increases retention.
3. improves marginal adaptation.
4. increases the thickness of gold.
A. (1) (2) (3)
B. (1) and (3)
C. (2) and (4)
D. (4) only
E. All of the above.

does bevel leads to increase retention in this case?

bevel will increase the surface area and decrease the thickness of gold in the margin which will lead to increaseretention and incease the elongation of gold particles (better polishing and adaptation)

i think that, please correct me if im wrong 😉
best wishe
ahmad

Yes you are correct,the gingival bevel increases marginal adaptation and decreases the thickness of gold at the margin.So I am guessing that #3 is correct and #4 is not in the answer that means option A as the correct guess 🙂 .Any opinions on the A?If someone has read that it protects enamel then A might be the answer.

 

[hanan]

hi,
My query is why is composite contraindiated in the case of lack of enough enamel at cavosufrace margin....??
It would really appreciate if anyone could explain...
treasure.

Hi treasure!
Well, like all bonded materials, composites require the presence of a tissue of a high rate of mineral component (such as enamel).

 

[gag]

hi guys
bevel in cast gold restorations improves the marginal fit and it comensates for casting inaccuracies but it does'nt improve retention[just came to know]
gag

 

[civil]

Yes i also agree to the statement that gingival bevel in cast gold restorations increases the marginal fit but it has nothing to do with overall retention of the restoration.

 

[civil]

Hi treasure!
Well, like all bonded materials, composites require the presence of a tissue of a high rate of mineral component (such as enamel).

Morover, lack of enamel at gingival cavosurface margins means preparation extends of root surface. composite restoration extensions on the root surface may exhibit gap formation at the junction of restoratrion and root cementum.