Cerec Porcelain inlay

A couple of questions for the group:

I just started seeing a new dentist 3 months ago and on the initial
visit , he and his assistant convinced me that I need to replace the
old metal fillings on 3 teeth with porcelain inlays. I never usually
question a doctor or dentist I just assume they are recommending
necessary treatment.

After talking to some people I'm starting to wonder, especially since
he has the cerec (?) machine in his office, if he didn't push me to do
the procedures because of this. Anyway...

1) If the insurance co. pre approves a procedure is it more likely to
be necessary?

2) I had 2 of the 3 done last week and now I have a sesitivity to hot
or cold liquids, is this normal? It seems like I am having more
problems with the teeth now then before the procedure.

3) I'm wondering if it is really necessary to do the third. The
previous dentist I went to never suggested that I needed the fillings
replaced, and I saw him 6 months proir to seeing the new guy. I
changed dentist due to a cross country move.

4) Are these inlays going to last the rest of my life(i'm 46)?

Believe it or not I can't get straight answers from the dentist, when I
am in the "chair" he only comes in the room to do the procedure or to
tell you the news from an xray. This is the good part or just
paranoia, the dental assistant is young and atractive and spends time
chatting while the dentist is away. The conversation is like picking up
a young lady in a bar, etc.. so naturally I get distracted. If I do
try to steer the conversation toward the negatives of a procedure she
suddenly is called away from the room. When she returns the blather
starts over, like she is interested in you personally. I know it is
all BS because when the visit is over she tells you to meet her at the
front desk, but she never shows up, you do your papper work and leave.

.

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