الفهرس 
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Abstract
The aim of this study was to evaluate the torque maintenance and the fracture resistance of zirconia, glass-ceramic and PEEK non-segmented implant-supported restorations after artificial aging. Thirty implant fixtures and their titanium bases were divided into three groups (n=10) according to the type of abutment material into: group Z: non-segmented zirconia abutments. group G: non-segmented glass-ceramic abutments. group P: non-segmented PEEK abutments. Zirconia non-segmented abutments (1567.17±111.39 N) followed by PEEK group (556.76±95.32 N), while IPS e.max CAD group (460.26±43.08 N). Conclusions: 1. Thermal aging affected the torque maintenance of all tested non-segmented abutments. 2. The abutment material (zirconia, IPS e.max CAD and PEEK) didn’t affect the torque maintenance of non-segmented abutments. 3. All tested non-segmented abutments could withstand the maximum intra oral masticatory forces in the maxillary premolar region.