title: Clinical Efficiency of Two Sequences of Orthodontic Wires to Correct Crowding of the Lower Anterior Teeth.
abstract: This study compared time to correction of mandibular anterior crowding using two arch wire sequences, one with conventional nickel-titanium (NiTi) arch wires and the other with conventional and NiTi heat-activated arch wires. Twenty-two boys and girls (mean age: 16.68 ± 2.66) with moderate crowding (3-6 mm) were assigned randomly to one of two groups and followed up for five months (six assessments) when arch wires were changed. Time to crowding correction was analyzed statistically using the Kaplan-Meier method. Data were collected during the five-month follow-up, and time to correction was compared between groups using the log rank test. At the end of follow-up, mandibular crowding was corrected in 100% of the cases in the group treated with the sequence that included NiTi heat-activated arch wires, whereas about 30% of those treated with NiTi arch wires were not completely corrected. There was a significant difference in time to complete treatment between groups (log rank = 5.996; p < 0.05). In the group treated with the sequence that included heat-activated wires, alignment and leveling of mandibular anterior teeth were completed earlier than in the group treated only with conventional NiTi arch wires. Clinical trial registration is found at RBR-7g5zng.
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Cláudia Maria de Castro
authors.initials: CM
authors.lastname: Serafim
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Júlio de Araújo
authors.initials: Jde A
authors.lastname: Gurgel
authors.affiliation: FACIT Dental School, Rua D 25, Qd 11, Lt 10, Avenida José de Brito George Yunes, 77818-650 Araguaína, TO, Brazil.
authors.forename: Carollyne Mota
authors.initials: CM
authors.lastname: Tiago
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Rudys Rodolfo de Jesus
authors.initials: RR
authors.lastname: Tavarez
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Etevaldo Matos
authors.initials: EM
authors.lastname: Maia Filho
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D009532:Nickel; D009969:Orthodontic Wires; D009971:Orthodontics, Corrective; D014025:Titanium; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium