Table-1.

List of the composition of the used materials in this study.

Material (Manufacturer)	Composition	Direction of use
GLUMA bond universal (Heraeus Kulzer)	4-META, 10-MDP, acetone, methacrylate monomers and Silane.	1. Apply and rub the adhesive for 20 s. 2. Air dry with a gentle oil-free air flow until the adhesive film is immobilized and the surface become glossy. 3. Light cure for 10 s.
Charisma flow composite (Heraeus Kulzer)	2,2-dimethoxy-1,2-diphenylethan-1-one, TEGDMA, CQ, Ba–Al–B–F–Si Glass and Pyrogenic SiO2 inorganic fillers (62% wt). The filler particle size is between 0.005 μm and 5 μm.	1. Apply Charisma flow in thin layers (max. 2 mm thickness). 2. Photoactivate the composite for 20 s.

Abbreviation: 4-META; 4-methacryloyloxyethy trimellitate anhydride, 10-MDP; 10-methacryloyloxydecyl dihydrogen phosphate, TEGDMA; triethylene glycol dimethacrylate, CQ; camphorquinone.