Abstract The aim of this study is to examine the repair bond strength of three different 5‐year water‐aged and non‐aged computer‐aided design/computer‐aided manufacturing (CAD/CAM) ceramics (leucite‐reinforced, lithium disilicate, and feldspathic ceramic) on which four different surface treatments (bur‐grinding, sandblasting, acid‐etching, and laser irradiation) have been applied with composite resin. Note that 360 ea. samples have been attained from CAD/CAM blocks. Each CAD/CAM ceramic has been randomly separated into two sub‐groups depending on aging procedure. The designed 5‐year water‐aged and non‐aged samples have been separated into four sub‐groups. Ceramic surfaces were repaired then the samples have been placed into shear test device. Three‐way variance analysis has been used in the comparison of the repair bond strengths depending on the ceramic type, surface treatment, and aging. Results have revealed that the repair bond strength values show differences depending on CAD/CAM ceramic type, surface treatment, and the aging of the surface (p < .001). While the aged and laser‐irradiated feldspathic CAD/CAM ceramics showing the highest shear bond strength, the lowest shear bond strength values were in aged and bur‐grinded feldspathic CAD/CAM ceramics. Irradiation with erbium chromium: yttrium scandium gallium garnet (Er,Cr:YSGG) laser has significantly increased the repair bond strength in leucite‐reinforced and feldspathic CAD/CAM ceramics, acid‐etching is suggested surface treatment for the lithium disilicate CAD/CAM ceramics.
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