• To approve an ear impression, it must fully capture the ears, including the helix, crus of the helix, tragus, and antitragus, with no voids.
• The impression must extend entirely beyond the second bend of the ear canal.
• It should be taken with the jaw open, using a bite block.
• Ensure the impressions are sent in a hard box to provide extra protection during shipping.

Overall Guideline

Make sure the area corresponding to cable socket is properly filled:

Sample of properly take ear impression: