Attachment devices and method for a dental applicance

A method for producing a digital model, said method comprising:

• providing a digital model of at least one dental feature;
• providing a digital model of at least one attachment device;
• and
• positioning the digital model of the attachment device on the digital model of the dental feature to produce a combined computerized model.

A method for producing a dental positioning appliance which is removably attachable to at least one dental feature to effect or enhance dental positioning, said method comprising:

• providing a combined digital model of at least one dental feature having at least one attachment device;
• producing a mold from the combined digital model, wherein the mold has the attachment device on a surface thereof;
• forming a dental positioning appliance over the mold;
• and
• removing the appliance from the mold, wherein the appliance has a receptacle corresponding to the attachment device and cavities corresponding to the dental features.

A method for moving teeth, said method comprising:

• securing an attachment device on a dental feature;
• removably positioning a first dental positioning appliance over the dental feature wherein the appliance comprises an elastic polymeric shell having a cavity which receives the dental feature and a receptacle which receives the attachment device;
• and
• removably positioning at least a second dental positioning appliance over the dental feature, wherein the second dental positioning appliance comprises an elastomeric shell having a cavity which receives the dental feature and a receptacle which receives the attachment device, wherein at least one of the receptacle and the cavity has a different configuration than that of the first dental positioning appliance.