plastic model making techniques
Saturday, August 28th, 2010Plastic Model making techniques
class II (MO 16) preparation techniques?
I am currently a dental student and looking for advice on preparing a conservative class II (MO 16) cavity.
At the moment I am still only practicing on plastic Frazaco models in the phantom heads. I have an assessment coming up and I seem to be struggling achieve the following requirements expected:
1.extend the proximal box until it JUST barely clears the contact point with 15,
2. do not make ANY mark on the 15 (whether it be with a bur or hand instrument such as a GMT)
My main issue seems to be I can't seem to avoid hitting the 15 without making the proximal box too big mesio-distally (it is expected that it should only be the width of our smallest amalgam plugger). I am also currently placing a folded matrix band between the 15 and 16 to avoid hitting the 15 but this makes it hard gain good access of the box as I'm preparing it.
Any tips/personal techniques/ advice on how others out there would go about this preparation would be greatly appreciated.
ANTHONY when ever you start your proximal box,dont start it from the contact area b/w 6 and 5.instead start to make the box in the 6 inside the contact area so that there is tooth structure b/w bur and 5.slowly Cut Away the tooth structure of 6 moving your bur mesially till only a paper thin structure of 6 is left.You Can later break this with enamel hatchet or GMT.this way you will never touch 5.
hope you will understand this method.
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