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Purpose: To establish the FEA models of unilateral maxillary defect and obturator retained with maxillary anterior attachment.Finish the FEA analysis through vertical and lateral loading.Methods: Use Mimics10.01 software to read and reconstruct the image data obtained by scanning a normal complete dentition volunteer to establish the 3-D solid model of unilateral maxillary defect and obturator.Cut the left maxilla by the software in order to build unilateral maxillary defect model.Use CATIA V5 software to establish 3-D model of SG mini slide-type attachment.Then,use ANSA software modify and assemble it to initial obturator to form the FEA model of attachment retained obturator.