Preparation
Once the case was enrolled based on the inclusion criteria mentioned above, the treatment teeth were prepared to receive ceramic veneers. Loupes magnifiers were used under chair lighting to ensure a suitable probing depth for preparation and to standardize preparation criteria as much as possible. Minimal preparation was resorted to by adopting the butt joint pattern that guarantees shortening the cutting edge to obtain the required translucent and esthetic aspect. The incisal edge was prepared by depth guide bur; this was followed by preparing the cervical region 0.1–0.3 mm and the mid‐region 0.3–0.5 mm. The cutting edge was also reduced by 1.0–1.5 mm. After removing the enamel via a cone round‐end bur to reach the required depth, the finishing lines were put under the gingival area to guarantee the esthetic aspect and the emanating appearance, adopting the light chamfer scheme. Moreover, the preparation was extended to a completely labial surface without exceeding the interproximal contact, rounding all the edges and linear angles. Later, manufacturing the veneers was achieved following the exact laboratory steps for both the zirconia group and the e.max group (Baldissara et al., 