Is this correct? Regarding RPD

[Spee]

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Hi everyone,

I have a question regarding something i noticed the other day in a clinic. An old lady came in with an upper RPD. This RPD (Class III) had an artificial crown (i think a PM) that was broken and needed to be fixed by the technician. The dentist then took an impression of the upper arch with the RPD in place (!) and then finally the lower arch and occlusion.

Something that bothers me is; Why do we take an impression with the RPD in place when it is going to be sent to the lab anyway? Would it be wrong to take an impression of the patient without the RPD in place and then send it to the lab and let the technician ajust the RPD to the cast?

What am i missing? Or did the dentist do it just to have the full occlusion?

Thanks in advance!

 

[kuzichan]

When you take an impression with the rpd in in place it's called a pick-up impression. The lab then pours the model with rpd in the impression and that yields a more accurate model than doing it in 2 steps like you said. Hope that helps.

 

[Spee]

When you take an impression with the rpd in in place it's called a pick-up impression. The lab then pours the model with rpd in the impression and that yields a more accurate model than doing it in 2 steps like you said. Hope that helps.

Thanks, helps a lot