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| The Masserann kit consists of a series of hollow trepans of differing sizes that can be used to cut around obstructions in the root canal. |
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| The right hand trepan shows flaring out of the edges. Use of this trepan would lead to unnecessary removal of dentine, weakening the root further. |
A trepan holding a removed core. It can be activated either manually or with the slow speed handpiece. |
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