Fabrication of dental appliances from phase-separated compositions

A method for fabricating an orthodontic appliance configured to reposition a patient's teeth, the method comprising:

• providing a polymerizable composition, the polymerizable composition including an initial ratio of a first polymerizable component to a second polymerizable component;
• and
• applying a holographic pattern of radiation to the polymerizable composition to form a portion of the orthodontic appliance, the portion comprising:
• a first region including a first ratio of the first polymerizable component to the second polymerizable component, the first ratio being different from the initial ratio, and
• a second region including a second ratio of the first polymerizable component to the second polymerizable component, the second ratio being different from the initial ratio and the first ratio.

A method for fabricating an orthodontic appliance configured to reposition a patient's teeth, the method comprising:

• providing a polymerizable composition, the polymerizable composition including an initial ratio of a first polymerizable component to a second polymerizable component;
• and
• applying a holographic pattern of radiation to the polymerizable composition to form a portion of the orthodontic appliance, wherein the holographic pattern comprises:
• a light region configured to form a first region of the orthodontic appliance having a first ratio of the first polymerizable component to the second polymerizable component, the first ratio being different from the initial ratio, and
• a dark region configured to form a second region of the orthodontic appliance having a second ratio of the first polymerizable component to the second polymerizable component, the second ratio being different from the initial ratio and the first ratio.