The aim of the study is to compare morphological features and to evaluate wetting capabilities of two fiber-reinforced composites (FRCS); group A: Stick Tech®, by Stick Tech Ltd, Turku, Finland, and group B: Ribbond®, by Ribbond Inc., Seattle, Washington, USA, used in orthodontic retention, by scanning electron microscope (SEM). 6 groups were identified in relation to the fiber used, A: Everstick®, B: Ribbond®, and to the different times of exposition to a fluid wetting resin (Heliobond®, by Schaan, Liechtenstein): A1-B1=0 seconds, A2-B2=5 seconds, A3-B3=5 minutes. Wetting was followed by 40 seconds of light curing with a conventional halogen curing light Optilux 501® d with a light intensity of 930 mW|cm2 and a wavelength range of 400-505 nm Samples were SEM analyzed both in cross section and lengthwise. SEM observation revealed a lengthwise direction of cylindrically shaped fibers immersed in a metacrylate matrix in group A1 and straight but woven fibers in group B1. In both control groups voids ranging between 0 μm and 20 μm were visible between the fibers and groups of fibers. Groups A2 and B2 showed uniform coverage with Heliobond® and microcracks were visible. In cross section views it is apparent that wetting with Heliobond for just 5 seconds was not sufficient for the adhesive to impregnate the fibers deeply. Groups A3 and B3 revealed a deeper penetration of Heliobond®; voids ranging between 5 μm and 15 μm could be observed only in the deepest portion of the fiber. The fiber’s preparation plays a decisive role: a longer fiber wetting time with fluid resin before curing, enhances the morphological features of FRC, making them more suitable for passive and active orthodontic systems, periodontology or prosthetic dentistry