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Should I Use Bite Blocks When Making An Impression?

Yes, Westone recommends using a Bite Block during impressions.  But there are a few reasons why not to as well.

It is Westone's opinion that an open-jaw impression using a Bite Block is appropriate for the majority of fittings. We base this opinion on the abundant research by Chester Pyrzanski from Starkey Laboratories. We recommend placing the Bite Block in the front, center of the mouth, with the jaw resting on the Bite Block.

Using a Bite Block will help facilitate a better acoustic seal and will result in an improved fit overall. We recommend the Bite Block on custom earmold fittings as well as custom earplugs for hearing protection and all custom musician products.

Research also indicates that using a higher viscosity impression material will improve acoustic seal and is the preferred material when taking open jaw impressions. Westone's SiliClone Firm®, Pink Silicast®, Blue Silicast®, and Silicone Singles® are ideal for this application. As always, regardless of the technique used, the accuracy of the earmold/earplug fit relies largely on the accuracy of the impression provided to the laboratory.

Here are some circumstances when a bite block might NOT be best choice when making an impression:

  1. When Open Jaw Impressions Are Not Needed: A bite block is typically used to keep the jaw open, which helps create a slightly larger ear canal impression. However, not all ear molds require this. For standard hearing aids, closed-jaw impressions are often sufficient and preferred.
  2. For Patient Comfort: Some patients may find using a bite block uncomfortable or difficult to keep in place, particularly if they have jaw or dental issues. In such cases, taking an impression without the bite block may be more comfortable for the patient.
  3. For Specific Types of Hearing Device: Certain types of hearing devices, like canal or in-the-ear hearing aids, do not always require the use of a bite block, as the natural shape of the ear with the mouth closed provides an adequate impression.
  4. Specific Audiologist Preferences: Some audiologists may feel that, based on their experience, a bite block isn't necessary for achieving the right fit for the device or mold they are creating, especially for patients who don't require extended jaw movement accommodations.
  5. For Jaw Position Stability: If the hearing aid or ear mold is for normal everyday use and doesn't require adjustments for jaw movements, an open-jaw impression might not be necessary. In fact, it could lead to a looser fit when the patient has their mouth closed.