Need solutions for these--Part 2 Questions

[Cutie Pie]

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Hello everyone,
I m sorry to start the same kind of thread but i think my questions got unnoticed.I shall be really thankful to someone who solve these
Problems
There is a question which says---If flouride conc of an area is 0.6% & the person has moved to an area where flouride conc.is increased by 0.4% what will be the flouride conc. at the end of seven years?



Pliz if anyone can tell me the answers & the reason ( why ) is that the answer---
for making retentive grooves in Cl 2 preparation in mand left second premolar which is the bbest hand instrument used
A. 10-7-14
B. 15-8-8
C. 13-80-8-14
D. 13-95-8-14

Arrange in the order of Lowest to highest Density
Gold
Dentin
Enamel
Amalgam
Porcelain
Composite
Thnaks in advance.

 

[explorer2010]

Arrange in the order of Lowest to highest Density
Gold
Dentin
Enamel
Amalgam
Porcelain
Composite

Composite: 1.6-2.3
Dentin: 2.1
Porcelain: 2.4
Enamel: 2.9
Amalgam: 11.6
Gold: 19.3

All g/ cu cm.

Density of composite resins varies, depending upon type and manufacturer. ( flowable/packable, Anterior/posterior).

There is one very good website for dental materials, properties
http://www.lib.umich.edu/dentlib/Dental_tables/Density.html

Can you elaborate your first question ? I feel something is missing.

second one- OMG, you need to see textbook. If I have to make retentive groove on # 20, I will use a fine bur. 🙂

 

[Cutie Pie]

Hi Explorer 2010,
Thanks for the reply.I had thought nobody is free to answer the questions since i was waiting for a long time.Thanks a lot. The exact questions r
The water supply of a mid west town has a natural flouride conc. of 0.6ppm.If flouride conc. is raised by 0.4ppm,tooth decay among grade school children is expected to decrease by what percentage after 7 years
0.2
0.4
0.6
0.7
Pliz tell me how to solve all these kind of qustions


2. Which of the following hand instruments r used to place retentive grooves in distal box of class 2 amalgam preparation on a mandibular left second premolar?
10-7-14
15-8-8
15-8-14
13-80-8-14
13-95-8-14
what is the basis for selecting the instruments & on which tooth & which class?
Thanks in advance.

 

[docontherun]

Hi Explorer 2010,
Thanks for the reply.I had thought nobody is free to answer the questions since i was waiting for a long time.Thanks a lot. The exact questions r
The water supply of a mid west town has a natural flouride conc. of 0.6ppm.If flouride conc. is raised by 0.4ppm,tooth decay among grade school children is expected to decrease by what percentage after 7 years
0.2
0.4
0.6
0.7
Pliz tell me how to solve all these kind of qustions


2. Which of the following hand instruments r used to place retentive grooves in distal box of class 2 amalgam preparation on a mandibular left second premolar?
10-7-14
15-8-8
15-8-14
13-80-8-14
13-95-8-14
what is the basis for selecting the instruments & on which tooth & which class?
Thanks in advance.

normally you would use a a low speed bur 38 but it can also be made by a high speed one, if it is with a had instrument you would use a marginal trimmer ...that is the ones that have 4 angles normally you have two ( right and left

 

[Cutie Pie]

Hi Docuntheran,
Thanks for the reply.This was the question in ASDA papers.The answer to this is 13-95-8-14.I wanted to know why not 13-80-8-14 or any other no.The question does not say anything abt the bur no.But thanks if they ask abt the bur no. ,it shld be in our knowledge.Thanks again.