Best retainer for relapse-prone teeth?

As an adult, I had an impacted canine that my orthodontist brought down. However, when my braces were removed and I was wearing my Essix retainer (24/7), the canine relapsed and essentially bent the plastic retainer and I had to be retreated. I also had a fiberotomy on that tooth during the retreatment. My orthodontist doesn't want to use a permanent retainer because of the pressure it will put on that canine. How do we prevent relapse of that tooth again? Is the Essix retainer still the best option?

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