The occlusal force does not load only on the screw. The internal conical connection interface also helps to transfer and distribute the loading force to the implant [13]. The axial compressive component of occlusal force during oral function causes axial displacement of the abutment to the implant connection, increasing the frictional resistance and screw joint stability of the dental implant [7, 8]. Three factors that may lead to the axial displacement of the implant-abutment connection are machining tolerance, the wedge effect, and the settling effect. Firstly, machining tolerance is a dimensional variation characteristic of machined components. The precision of every implant component varies during manufacturing due to machining tolerance [14]. Secondly, the wedge effect occurs when tightening torque or loading force is applied to the abutment [15]. The abutment acts as a wedge transferring the axial force directly to the implant. Lastly, the settling effect occurs when rough spots on the contacting surfaces of the connection are flattened under load [16]. It causes the two surfaces to come closer together and leads to axial displacement. This axial displacement causes the length of the abutment screw to shorten, diminishing the screw preload [17]. The settling effect is the main cause of screw loosening. When the abutment is fastened to the implant body with the abutment screw, a settling phenomenon occurs in which the implant body and the abutment are deformed. Even if fastened at 30 N cm, depending on the implant system, the loosening torque becomes smaller than the 7 to 10% fastening torque. After 5 min from this point, it is necessary to loosen it twice [18]. The degree of settling depends on the surface roughness, surface hardness, and magnitude of the tightening torque and of the occlusal loading force [16]. On the one hand, the settling effect [17] causes the axial displacement leading to the decrease of the screw preload. On the other hand, the axial displacement causes the cone connection surface adaptation providing frictional resistance and screw-joint stability [7, 8].