puzzling concept

[dental material]

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1 less vertical overlap of anterior teeth , the shorter the cusps must be .With little incisal guidance from this end to end relationship , the shorter cusps must be to allow smooth protusive movements.
2 the greater vertical overlap of anterior teeth , longer cusps must be.The anterior teeth contact immediately and dissocclude the posterior teeth.
3 the greater the horizontal overlap of anterior teeth , the shorter the cusp must be to allow for a smooth protusive movement untill the anterior teeth contact.
4 the less horizontal overlap of anterior teeth , the longer the cusp may be since the teeth contact immediately and dissocclude the posterior teeth.

Can somebody explain pls.

 

[dental material]

1 less vertical overlap of anterior teeth , the shorter the cusps must be .With little incisal guidance from this end to end relationship , the shorter cusps must be to allow smooth protusive movements.
2 the greater vertical overlap of anterior teeth , longer cusps must be.The anterior teeth contact immediately and dissocclude the posterior teeth.
3 the greater the horizontal overlap of anterior teeth , the shorter the cusp must be to allow for a smooth protusive movement untill the anterior teeth contact.
4 the less horizontal overlap of anterior teeth , the longer the cusp may be since the teeth contact immediately and dissocclude the posterior teeth.

Can somebody explain pls.need help!
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[dental material]

also anyone can tell what's NBDE CRACK 1 .
what's better kaplan online questions or nbde 1 ?