`Preliminary Amendment dated April 3, 2017
`
`Attorney Docket No.2 22773-826401
`
`Amendments to the Abstract:
`
`Please replace the Abstract with the following:
`
`A dental appliance for positioning a patient’s teeth includes a removable orthodontic
`
`tooth positioning appliance having teeth receiving cavities shaped to directly receive at least
`
`some of the patient’s teeth and apply a resilient positioning force to the patient’s teeth. The
`
`appliance includes a hard polymer layer having a hard polymer layer elastic modulus disposed
`
`between a first soft polymer layer having a first soft polymer layer elastic modulus and a second
`
`soft polymer layer having a second soft polymer layer elastic modulus. The hard polymer layer
`
`elastic modulus is greater than each of the first soft polymer layer elastic modulus and the second
`
`soft polymer layer elastic modulus. At least one of the first soft polymer layer and the second
`
`soft polymer layer has a flexural modulus of greater than about 35,000 psi.
`
`9069451_1.doc
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`Page 2 of 6
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