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915 impressions from an Oticon production site were inspected. The ear canal typically has two bends, and all impressions extending beyond the second bend were singled out, as these are most likely to include the CBJ. 84 impressions met this criterion and were subsequently laser scanned. The CBJ was then manually identified and marked on each scanned impression.
Examination of the individual ear scans showed that the average distance from the second bend of the ear canal to the CBJ is 1.8 mm, i.e. the CBJ is usually found beyond the second bend. The position of the CBJ ranged from -1 mm to 4 mm relative to the second bend. This implies that ear impressions must be taken well beyond the second bend to include the CBJ with certainty, while considerable individual variation must be expected.
Nielsen C, Darkner S (2011). The cartilage bone junction and its implication for deep canal hearing instrument fittings. Hearing journal, 64(3), pp. 35,36,40,42.
The Oticon Foundation established the Eriksholm Workshop series for gathering small groups of experts in audiology and hearing science.
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