Effects of active and passive lacebacks on antero-posterior position of maxillary first molars and central incisors

Abstract

The purpose of this study was to compare the effects of active and passive lacebacks on antero-posterior position of maxillary first molars and central incisors during leveling phase. Twenty-three subjects with Class I and Class II malocclusion were treated with first premolars extraction using preadjusted appliances (MBT 0.022-inch brackets). The leveling phase was performed with stainless steel archwires only. The sample was divided into 2 groups: 14 subjects received active lacebacks (Group 1) and 9 subjects received passive lacebacks (Group 2). Lacebacks were made from 0.008-inch ligature wire. Lateral cephalometric radiographs were taken pre-and post-leveling phase. Student's t-test was applied to determine the differences between pre-and post-leveling mean values and to determine the mean differences between groups. In Group I, the first molars showed a significant mesial movement, whereas no change was observed in Group 2. In both groups, maxillary central incisor crowns moved to lingual side. In conclusion, active laceback produced anchorage loss of maxillary first molars whereas passive laceback did not affect the position of these teeth. Active and passive lacebacks were effective in preventing central incisor proclination.

Class I malocclusion with severe double rotrusion treated with first premolars extraction

“…Subsequently, first premolars extraction and mini-implant placement was performed on the four quadrants between second premolars and first molars, 8 mm away from the orthodontic arch on the attached gingiva and perpendicular to the buccal cortical bone. 5 , 6 , 7 Initially, mini-implants were used for partial canine retraction with active lacebacks 8 gaining space for alignment of incisors and preventing their buccal inclination.…”

Individual canine retraction: RCT comparing Mulligan bypasses arch and Active laceback ligatures

“…2 When these ligatures active causes retaction. 3 Mulligan bypass arch are usually made with .018" round stainless steel archwire. Here incisors are bypassed and anchor bend is given anterior to molar.…”