3-D finite element study on maxillary body protraction using implant anchorage / 实用口腔医学杂志

ABSTRACT

Objective:To explore the stress change rule of craniofacial bone suture and the interface of bone-implant against differ-ent strength and direction of protraction on the implant anchorage in alveolar bone.Methods:The original DICOMdata of 2-D image of craniofacial complex were obtained by high resolution CT scanning.3-D finite element models of craniofacial complex were devel-oped according to the DICOMdata.Forces of 1 -1 0 N inclined at 0 -60°to Frankfort horizontal plane in the anterior and inferior di-rections were respectively applied on the implant anchorage in the alveolar bone at 32 23 .Data of principle stress and Von Mises Stress of each mode of each simulaton was caculated.Results:The change rule of the effectiveness of different force value of protrac-tion in the same direction was the same in different stress zone;that of the same force value of the protraction in differente direction differed in different stress zone.When the protraction angle was less than 30°,the maxillary complex will spin up.In the 30°,the maxillary complex showed the forward growth.Between 40°-50°,the growth direction was the same with the protraction direction. When the protraction angle was more than 50°,the maxillary complex showed down spin.Conclusion:Protraction force of 1 -1 0 N at 30°-50°to Frankfort horizontal plane on implant anchorage in the alveolar bone at 32 23 can induce maxillary complex grow for-ward.