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The design that fills the entire concha and canal for optimal sealing is known as the Shell earmold design. This type of earmold is specifically crafted to provide a snug fit that encompasses the outer ear structure, known as the concha, and extends into the ear canal.

This comprehensive coverage ensures that there is minimal sound leakage, allowing for improved sound transmission from the hearing device to the ear. Such a design is particularly beneficial for users who require maximum amplification and clarity, as it enhances the effectiveness of the hearing aid while also providing comfort.

The other earmold designs, while useful for specific applications, do not achieve the same level of sealing and coverage. For example, the Half Shell design only covers part of the concha and canal, which can lead to less effective sound blockage and leakage. Semi Skeleton and Skeleton designs are also less enclosing, making them suitable for different preferences or levels of required amplification, but they do not provide the optimal sealing characterized by the Shell design.