Comparison of anterior retraction and anchorage control between en masse retraction and two-step retraction: A randomized prospective clinical trial

Autor(es)

Schneider, Patricia Pigato ^[1] ; Gandini Junior, Luiz Gonzaga ^[1] ; Monini, Andre da Costa ; Pinto, Ary dos Santos ^[1] ; Kim, Ki Beom ^[2]

Afiliação do(s) autor(es)

^[1] UNESP Sao Paulo State Univ, Sch Dent Araraquara, Dept Orthodont, Araraquara, SP - Brazil

^[2] St Louis Univ, Dept Orthodont, Ctr Adv Dent Educ, St Louis, MO 63103 - USA

• Tipo de documento: Artigo Científico
• Fonte: ANGLE ORTHODONTIST; v. 89, n. 2, p. 190-199, MAR 2019.
• Citações Web of Science: 1

Resumo

Objectives: The purpose of this two-arm parallel trial was to compare en masse (ER) and two-step retraction (TSR) during space closure. Materials and Methods: Forty-eight adult patients with bimaxillary protrusion who were planned for treatment with extraction of four first premolars were enrolled. All patients were randomly allocated in a 1: 1 ratio to either the ER (n = 24) group or the TSR (n = 24) group. The main outcome was the amount of posterior anchorage loss in the molars and the retraction of the incisors between ER and TSR; the difference in incisor and molar inclination was a secondary outcome. Lateral cephalometric radiographs and oblique cephalometric radiographs at 458 were taken before retraction (T1) and after space closure (T2). Cephalograms were digitized and superimposed on the anatomic best fit of the maxilla and mandible by one operator who was blinded to the treatment group. Results: Neither incisor nor molar crown movements showed any significant differences between the ER and TSR. There were no significant differences in the tipping of incisors and molars between the two groups. Conclusions: No significant differences existed in the amount of retraction of incisors and anchorage loss of molars between ER and TSR. Changes in incisor and molar tipping were similar, with the crowns showing more movement than the apex. (AU)

• Processo FAPESP: 08/57644-9 - Avaliacao do tempo de tratamento e perda de ancoragem entre duas formas de retracao anterior
• Beneficiário: Luiz Gonzaga Gandini Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Regular