IRCT20190705044102N1 IRCT 2019-09-26 Kermanshah University of Medical Sciences Clinical comparison of two Initial arch wires for amount of tooth alignment and perception of pain Clinical comparison of two Initial arch wires (A.NiTi and Cu.NiTi) for amount of tooth alignment and perception of pain: A Randomized Clinical Trial 2019-10-02 anticipated 88 Complete https://irct.ir/trial/41865 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The method of the randomization was stratified by age (12– 17.99 and 18–25 years) and sex, with permuted blocks (fixed block size of 8). Allocation was concealed with numbered, sealed and opaque envelopes containing the group allocation cards, Blinding description: In this clinical trial,outcome assessor is blind about how patients are assigned.Participants in the study are also blind toward their own group while they are aware of similar costs and benefits of each arch wires.In other words, the participants will be unaware of the nature of the arch wires used.Statistical analyst is unaware about the research hypothesis. N/A Dental crowding. Intervention 1: Intervention group: Application of A.NiTi 0.014 inch wires as initial arch wire. Intervention 2: Control group: Application of Cu.NiTi 0.014 inch wires as initial arch wire. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is No more information.