There are two types of implant design for the upper central incisors.  The first one is to place implants as large as possible (Fig.2), i.e., place the implants in the middle of the alveolar bone, irrespective of the occlusion with the opposing. 

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Xin Wei, DDS, PhD, MS 1st edition 08/13/2014, last revision 08/13/2014