Glad you are happy with your end result and that you want to keep it that way. I would not be concerned with the models being broken as that is often a consequence of the manufacturing process.These models are called the working models and are often modified to allow for a more comfortable fit. As Dr Alford said, the orthodontist should have a final copy of the models anyway. However, these are usually manufactured of a different type of stone, not ideal for moulding of new retainers, more to use as a 3D record of your final alignement.
Your main concern is that if you lose or break your retainers, that you will need new ones and that your teeth will move. This is correct, IF you don't get new ones made. If you make a new appointment straight away and have moulds taken once they are broken or lost, this is a new record of your teeth, in approximately the same position, before any relapse.
It will never be exactly the same, even if you take them now. The material distort over time, including your retainer. Taking the mould causes slight movements in your teeth also due to the amount of pressure on them.
So, relax, wear your retainer as advised and be careful not to lose it or break them. If you do break or lose them, get a new set made straight away.
I personally would always take a new set of impressions for any retainer, even if you had the originals. There is not usually any extra charge for this. The charge you are talking about now, I imagine, is an additional charge to take moulds or duplicate models that the orthodontist does not feel you need. If you were getting new retainers either way, you would have to pay for them.
Hope this helps
Dr Frank Farrelly
30 Burton St, Darlinghurst NSW 2010
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