[Changes caused by earmoulds in shape of the formation of the external auditory meatus (author's transl)].
The lateral part of the external auditory meatus is widened by hearing aids. This was found when comparing angles, diameters and volumes of the  external auditory meatus in two groups of children. One group of 56 children had bilateral hearing aids, the other group of 48 children of the same age had healthy normal ears and did not use hearing aids. The widening process is increased with the length of time that a hearing aid is used.
D002508:Cephalometry; D002648:Child; D002675:Child, Preschool; D004424:Ear Canal / Q000473:pathology*; D006310:Hearing Aids / Q000009:adverse effects*; D006801:Humans; D008961:Models, Structural; D013997:Time Factors
Formänderung der äusseren Gehörgänge unter dem Einfluss von Ohrpassstücken.