part of part of intersects midsagittal plane of adjacent to adjacent to upper jaw region skeleton of upper jaw upper central incisor tooth diastema between central incisors diastema between upper central incisors 2 midline maxillary diastema interdental space, upper central incisors interdental space between maxillary central incisors A space or gap between the left and right central incisors on the upper jaw. UBERON:0035116