title: Comparative distalization effects of Jones jig and pendulum appliances.
abstract: BACKGROUND
  In this study, we compared the dentoalveolar changes of Class II patients treated with Jones jig and pendulum appliances.
  
  
  METHODS
  The experimental group comprised 40 Class II malocclusion subjects, divided into 2 groups: group 1 consisted of 20 patients (11 boys, 9 girls) at a mean pretreatment age of 13.17 years, treated with the Jones jig appliance for 0.91 years; group 2 comprised 20 patients (8 boys, 12 girls) at a mean pretreatment age of 13.98 years, treated with the pendulum appliance for 1.18 years. Only active treatment time of molar distalization was evaluated in the predistalization and postdistalization lateral cephalograms. Molar, second premolar, and incisor angular and linear variables were obtained. The intergroup treatment changes in these variables were compared with independent t tests.
  
  
  RESULTS
  The maxillary second premolars showed greater mesial tipping and extrusion in the Jones jig group, indicating more anchorage loss during molar distalization with this appliance. The amounts and the monthly rates of molar distalization were similar in both groups.
  
  
  CONCLUSIONS
  The Jones jig group showed greater mesial tipping and extrusion of the maxillary second premolars. The mean amounts and the monthly rates of first molar distalization were similar in both groups.
authors.affiliation: Department of Orthodontics, Bauru Dental School University of São Paulo, Bauru, SP, Brazil. mpatel@superig.com.br
authors.forename: Mayara Paim
authors.initials: MP
authors.lastname: Patel
authors.forename: Guilherme
authors.initials: G
authors.lastname: Janson
authors.forename: José Fernando Castanha
authors.initials: JF
authors.lastname: Henriques
authors.forename: Renato Rodrigues
authors.initials: RR
authors.lastname: de Almeida
authors.forename: Marcos Roberto
authors.initials: MR
authors.lastname: de Freitas
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Pinzan
authors.forename: Karina Maria Salvatore
authors.initials: KM
authors.lastname: de Freitas
mesh_terms: D000293:Adolescent; D000497:Alloys; D001641:Bicuspid / Q000473:pathology; D002508:Cephalometry; D002648:Child; D003722:Dental Alloys; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D008963:Molar / Q000473:pathology; D016382:Orthodontic Appliance Design; D009969:Orthodontic Wires; D010159:Palate / Q000473:pathology; D013193:Stainless Steel; D014087:Tooth Movement Techniques / Q000295:instrumentation* / Q000379:methods
chemical_list: D000497:Alloys; D003722:Dental Alloys; D013193:Stainless Steel; C013616:nitinol