Zach,
I just got my bonded retainers this past week after almost five months of having only removable ones. In addition to the bonded retainers, my ortho trimmed my Vivera retainer to fit around them so that my back teeth can also be retained. We've gone ahead and ordered new Vivera retainers that will completely cover the bonded retainers and I'll use those when they arrive.
I finally went with bonded retainers because my teeth were not settling well with only removable, and the idea of wearing those most of the time for many more months at the least did not appeal to me. I did get used to the constant tightness in my front teeth when reinserting them after a few hours of leaving them out. It seemed as if the tightness was only with the front teeth; however, after getting the bonded retainers, I realize that there is a tiny bit of tightness in the back teeth when I put the removable ones in (I only wear them at night). Soooo... it seems to be that although there is no visible change in the back teeth during the day, they are clearly shifting around a bit. As a result, I am convinced that it is important to retain the back teeth as well. It looks as if night time wear will work for me (and I may eventually be able to lessen that wear to only a few nights weekly) so I suspect that may be the case with everyone.
I had very little movement in my back teeth during treatment, and my bite was fine before getting Invisalign, so I wonder if people who have had even greater movement during treatment are even more susceptible to relapse.
Hope this makes sense (and helps!)


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