The Importance of the ImpressionAn ear is like a fingerprint – it is one of a kind. For this reason,
we at Mid-States believe that the most critical factor in achieving a satisfactory, and hopefully better than satisfactory, hearing instrument fitting is the ear impression.
The accuracy of the impression will determine the comfort, seal, fit, and in part the function of the earmold or hearing instrument itself. Each of these factors will play a major role in the success of your fitting.
When taking an impression, and when reading through this information, remember the importance of the impression. We know we are good at what we do, but we can’t perform magic. To produce our best earmold, we need your best impression!
Thoughts and Preparation
As you begin the impression procedures outlined in this section, always keep the following thoughts in mind:
Exhibit Professionalism
- make sure your materials are organized and ready for use
- insure that everything meets good hygiene standards, including your hands
- put the client at ease by explaining what you will be doing and why
Use Care and Caution- perform a thorough otoscopic exam prior to the impression to check placement of the block, and again after removal
- during the otoscopic pay attention to the length, diameter, and the direction of the canal
- also take notice of any problems (wax, discharge, inflammation, eardrum abnormalities etc.)that need to be discussed or referred for medical advice
Critically Examine the Impression- after completing the impression, check to determine that all areas are adequately filled
- if you are not satisfied, now is the time to remake the impression – everyone will be happier
Before the Impression
As mentioned above, initially do an otoscopic exam of the canal and then place your block. Of critical importance is the size and placment of the foam or cotton block. Both types are available in a variety of sizes. In some cases it may be necessary to combine more than one block to achieve the necessary size. If your are working with a surgical ear, it is best to have the blocks placed by a physician. When there is a large amount of hair, it may be necessary to trim some using blunt tip scissors to reduce the possibility of injury. Once the correct size is chosen proceed as follows:
- insert block into the canal (use an earlight or other tool of choice and be sure to brace the hand holding the tool to prevent injury should there be any sudden head movement
- insert the block past the second bend in order for the sound direction to be determined
- perform another visual check to insure that the block is completely occluding the canal and that it is positioned so as to provide a ‘flat’ canal tip showing the full diameter (as a precaution, be aware that foam plugs placed at an angle may be compressed ‘sideways’ by the flow of the material which can then bypass the block!)