Can forces be applied directly to the root for correction of a palatally displaced central incisor with a dilacerated root?

Simplifying two-vector mechanics calculations for challenging tooth movements

The purpose of this article was to describe a simple graphical driven method for determining the necessary two-vector mechanics (TVM) as an alternative solution to the ideal or single force. In orthodontics, some tooth movements are difficult to achieve, mainly because of the impossibility of getting the point of application for the necessary force system. Given two points in biomechanically accessible areas, adding together two vectors applied to those points will result in an equivalent force system. The method was developed based on previous research, 3,880 hypothetical cases were analyzed to determine the trends between the resulting forces and their relative locations. A graphical driven TVM method (GTVM) for establishing the necessary TVM is presented in a manner that combine different procedures from the traditional method that simplify the analysis and may allow the user to perform more complex orthodontic cases making easier to compare systems of force equivalents.

An Orthodontic Approach for the Correction of Transposition along with Multiple Impacted Teeth

Impaction of teeth affects patients' esthetics, speech, and masticatory efficiency. In addition, the transposition of teeth makes a case difficult to manage. This case report describes a case of a 14-year-old boy with the impaction of the maxillary right central incisor and canine along with the transposition of the right canine and lateral incisor. The impacted teeth were surgically exposed and guided into the arch using orthodontic traction. Likewise, the transposition was corrected orthodontically by moving the teeth to their desired position without any detrimental effect on the adjacent teeth. The patient's esthetics and occlusion improved substantially after the orthodontic intervention.

Traction of impacted and stacked maxillary anterior teeth with precise biomechanics followed by torque control using gate spring

Impaction of multiple maxillary anterior teeth is a rare condition; when it occurs, it impacts the patient's chewing function and smile esthetics, and it has always been problematic for clinicians. This case report presents an 11-year-old girl with impaction of 3 adjacent maxillary anterior teeth, including labiopalatally oriented maxillary right central and lateral incisors and a mesially inclined maxillary right canine. These 3 impacted and stacked teeth were sequentially aligned after surgical exposure and orthodontic traction, and the surrounding dentigerous cyst healed simultaneously. Precise and delicate biomechanics will control root movement and prevent root collision. Gate spring, a novel torquing auxiliary, was used for highly efficient root torque movements of the previously impacted incisors. After 32-month treatment, the patient's occlusion and esthetics greatly improved.