Fig. 1. Measurements on the upper and lower jaws

Fig. 2. Bone tissue area measurement

Fig. 3. Root-length measurement

Fig. 4. Measurement of interdental septum height

Fig. 5. Measurement of mandibular and maxillary incisor inclination

Fig. 6. The schematic representation of maxillary linear tooth movement in the surrounding bone tissue in the event of retrusion. Is is the cutting edge of the maxillary incisor; Ias is the apex of the maxillary incisor; Ias–Is is the incisor long axis; NL is a line in the maxillary plane; ∠Is–Ias–NL is the angle of maxillary incisor inclination; BD is a long tooth axis in the event of a normal (standard) incisor position; AA1 is the long axis of a retruded incisor (actual position); O is the center of resistance; ∠BOA is an angle between the normal (standard) and actual axes; ∠COD is an angle between the normal (standard) and actual axes; AC means that the line BA is perpendicular to the line AC; ∠ Is–Ias –L (∠Is–Ias to NL) is an angle that characterizes the normal position of the incisor relative to the maxillary plane NL; Ias–Is is the long axis of a normally positioned (inclined) incisor; AA1 is the long axis of a retruded incisor; point B is the projection of the apical point A of a retruded maxillary incisor to the axis of a normally inclined tooth; point D is the projection of the deepest point of the cementoenamel junction in the upper cervical region of the root of a retruded incisor to the long axis 12 of a normally inclined incisor; point С is a point in which the perpendicular drawn from the deepest point of the cementoenamel junction in the upper cervical region of a retruded tooth to the tooth axis of a normally inclined incisor and the line AA 1; O is the center of resistance; ∠BOA = ∠COD is an angle between the normal (standard) and actual axes; triangles АОВ and СОD are right-angled triangles

Fig. 7. Schematic representation of mandibular incisor retrusion