JMN
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They will stain as anything really will. They will not fracture without a LOT of intentional bending, but they will become less retentive and pull away from the tooth after a long enough period of time. Especially if the pt is a heavy hot coffee or hot tea drinker.I've never used acetal clasps. They're not common here, eg I've never seen them used ever. I was worried about trying them because I wasn't sure about long term success from staining and fracture etc etc, or even how effective they are. Would like to add them as an option so really interested in knowing how you've found them? Anything to be aware of when fabricating/finishing?
Re flexibles. I agree with what you guys have said, but my point was we seldom have problems with co/cr frames, so the need for flexibles should be practically non existent.
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I have one out that at 1 year recall was still looking quite good. A clear Flexite. A few others here and there, but not with docs that keep me informed, not a great demand around here. Those with higher esthetic demands usually have the money to go implant retained or supported.