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05). RESULTS Group zirconia crown (G1) showed significantly higher fracture strength than Group (G2) lithium disilicate endocrown (p less then 0.05). CONCLUSION The zirconia crown showed higher fracture resistance than lithium disilicate endocrown. However, both tested zirconia crown and lithium disilicate endocrown withstood the application of axial occlusal forces greater than the reference values for posterior occlusal loads. Copyright © 2019 Yasmine El Makawi, Nagwa Khattab.AIM To evaluate and compare the effect of enamel preparation