Zirconia Implant Abutment Prepared By DLP 3D Printing Technology And Performance Characterization

The zirconia all-ceramic dental implant abutment was prepared by DLP(Digital Light Processing)3D printing technology,and the orthogonal test with 9 sets of heat treatment process parameters was designed.The influence of various parameters on the sintering quality of zirconia was investigated.Various testing methods were used to characterize different properties of the zirconia abutment.According to the TG-DSC(thermal analysis data),all the photosensitive resin was substantially decomposed at 400 ° C.And sufficient holding time should be given at five critical temperature nodes.According to the shrinkage rate,crystal quality and microstructure of the zirconia,we could determine that best sintering heat treatment process parameters was at 1450 °C for 1.5 h.The zirconia test blocks prepared by the best sintering process parameters were characterized.The zirconia composition obtained by Raman and EDS analysis has a single component and no other impurities.The microstructure of the zirconia test block is observed by SEM analysis.With good morphology,sufficient grain bonding,no voids,voids and other defects,the relative density of the density is 99.48%.The zirconia test strips printed in different directions have obvious anisotropy.The threepoint bending strength of the strips printed in the horizontal direction is better than that of the vertical direction,and the strength is 600 MPa.Finally,29 different pre-angled implant abutments were designed by finite element simulation method,and the fatigue loading simulation experiment was carried out.The results show that the smaller the pre-angle,the smaller the maximum stress and the higher the safety factor.When using it,it should be fully taken care of,and the pre-angle should be reduced as much as possible.