phenotype affects entity abnormal jaw morphology syngnathia 2017-09-11T10:41:00Z MP:0030085 maxillomandibular fusion MPheno.ontology fusion of the upper and lower jaw; fusion can range from simple mucosal bands (synechiae) to complete bony fusion (synostosis); syngnathia can occur in the midline, or laterally, and it can be uni- or bilateral fusion of the maxilla and mandible abnormal midface morphology upper jaw region fused upper jaw region and lower jaw region