الفهرس 
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Abstract
This in vitro study was aimed to evaluate and compare the effect of two connector designs on the compressive strength of posterior inlay-retained fixed dental prostheses made from two different ceramic systems. Twenty-eight inlay retained fixed partial denture (IRFPDs) were used to replace missing lower right first molar. According to the IRFPDs materials (IPS e.max press and Zirconia), the specimens were divided into two main groups A and B (n=14). These groups were further subdivided into 2 sub-groups 1&2 (n=7) according to the connector designs used (large radius and small radius). The IRFPDs were manufactured using the hot press and CAD-CAM techniques respectively. All specimens were cemented using self-adhesive resin cement. Each specimen was placed on the test device, and compressive strength was applied till the fracture occurred. All the results obtained were statistically analyzed by two way ANOVA test and student t test (level of significance p < 0.05).
Results : Revealed that the highest mean value of compressive strength was for large radius connector with zirconia IRFPDs. While the lowest value was for small radius connector with IPS emax press IRFPDs. Within the limitations of this in-Vitro study the following conclusions could be obtained ; zirconia demonstrated high compressive strength than IPS e.max press. Large radius connector demonstrated high compressive strength than small radius one. Despite the IPS e.max press possessed the lowest compressive strength values for both types of connector designs; however these values were greater than the average occlusal force recorded in several studies.