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The retainer was like the mold and cast.

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The retainer was acting like a mold and cast.

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they created a mold/cast

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Making a retainer is kinda like using pressure to make a mold of your teeth just like how in the real world after an animal dies and over hundreds of years it gets fossilized.

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the paste and the retainer is like a mold and a cast of a fossil it makes a stone they had to fill it in

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They were taking an impression of the teeth which is like a mold fossil and a cast fossil. They take a mold of the teeth and then fill it in to get the cast.

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Impression, filling, copy, layered, stone, harden, material, pressure, heat

The retainers share similarities to real-world fossils. The impressions of the teeth are there as a copy to make a mold. This impression is then filled to make a cast in order to make the retainer, similarly how real-world cast fossils are made.

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The retainer was like the mold and cast fossil .

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They made a impression of the persons teeth, like a mold. And it looked like an almost exact copy.

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they made an impression which is like a mold / they filled it to make a retainerand it was like a cast becuase they filler the mold

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The retainer had to me molded like a cast or mold fossil

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The retainer was like a mold and cast fossil. They had to fill in the empty space with the stuff that makes the mold for the retainer (mold). The stuff then had to harden to make a perfect replica of the original mold which then would make a perfect cast.

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The Orthodontists were making an impression of the kid's teeth to make an exact copy. Fossils are impressions as well and both scenarios are similar. Much like molds and casts.

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The impression and new retainers are examples of both mold and cast fossils. The impression for the retainer is filled with a material that would replicate the hole once dried. This is like molds and casts as molds are used as a base to create casts. Casts are made using molds via filling the mold with sand/other materials.

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The Retainer had to be molded like a fossil to make secure and presentable. Another relation is almost all the words have the processes of a retainer.

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Impression-fossil shape, stone-the hardeing processing, heat and pressure- help finalize the form of the fossil