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Understanding developmental groove in teeth

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Akam ahz

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Hello,
I'm a first year dental student, and in my dentition book I came across the topic of "crown depressions" in which the author says about the developmental groove in posterior teeth:

"Grooves act as spill ways for cusps during lateral and protrusive jaw motions."

I don't get the sentence above, so an explanation in a simple language would be great.

Thanks in advance!

 
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