• SDN Site Updates

    Hey everyone! The site will be down for approximately 2 hours on Thursday, August 5th for site updates.

  • How To ACE Your Medical School Interview

    In this webinar hosted by SDN with experts from BeMo Academic Consulting, you will learn a simple five-step process to help you translate your interview invitation into an acceptance.

mesh

Junior Member
10+ Year Member
May 28, 2006
348
0
Status (Visible)
Which of the folllowing statements describe composite resins
I They can be placed and finished in the same appointment.
II. They are more color stable than unfilled resins.
III. They are similar to Amalgam with respect to coefficient of Thermal expansion.
IV. The finished surface tends to be somewhat rough.


3rd option is wrong for sure
so is the 4th. ......HELP
 

LKY

Full Member
10+ Year Member
Dec 23, 2006
146
0
Status (Visible)
Which of the folllowing statements describe composite resins
I They can be placed and finished in the same appointment.
II. They are more color stable than unfilled resins.
III. They are similar to Amalgam with respect to coefficient of Thermal expansion.
IV. The finished surface tends to be somewhat rough.


3rd option is wrong for sure
so is the 4th. ......HELP

Well, I am trying to answer this question
I. Yes..all you guys know that composite can be placed and finished in the same appontment.
II. Yes..Unfilled resin have a similar composition with a self-curing resin, because of its lack of color stability and strength, later on, in the development of the material, heat-curing resing were introduced for the material used for acrylic denture.
III. NO...Coef of thermal expansion is a tendency of a material to change in shape when it subject to temperature changes. Direct gold have almost similar coef of thermal expansion with tooth; Composite and amalgam are almost similar - but not similar (composite seems to be higher than amalgam - 28-35;22-28 ppm/cx10, respectively) and unfiller resin is the highest in term of coef of thermal expansion.
IV. Yes..Composite materials finishing surface tends to be rough because of it filler particle contain...

So the answer seems to be I, II and IV are right.
 
This thread is more than 14 years old.

Your message may be considered spam for the following reasons:

  1. Your new thread title is very short, and likely is unhelpful.
  2. Your reply is very short and likely does not add anything to the thread.
  3. Your reply is very long and likely does not add anything to the thread.
  4. It is very likely that it does not need any further discussion and thus bumping it serves no purpose.
  5. Your message is mostly quotes or spoilers.
  6. Your reply has occurred very quickly after a previous reply and likely does not add anything to the thread.
  7. This thread is locked.