The best replacement for twin block is bionator.

The best alternatives to twin block are rated as following:
★★★★★  bionator
★★★★  herbst appliance
★★★  herbst

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Speaking about twin block, one probably shouldn't forget about headgear.

Other search terms related to twin block and their ratings are:
★★★★★ headgear
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twin block
bionator
herbst appliance