en ارتودنسی Orthodontics پژوهشي Research <p> Lip bumper treatment has been shown to successfully increase arch width, procline the incisors, and distalize molars. However, few studies have been performed showing the long-term stability of lip bumper treatment. In this study, mandibular casts taken by a single practitioner from 51 patients treated with lip bumpers without rapid palatal expansion were analyzed at pretreatment, post-lip bumper treatment, posttreatment, and long-term out of treatment. Measurements of arch width, arch depth, arch length, and anterior crowding were made. During treatment, there was a mean decrease in irregularity of 3.73 mm, with a posttreatment increase of 0.76 mm, for a net decrease of 2.97 mm. Despite posttreatment decreases, significant gains in arch width were maintained for extended periods of time. The intercanine width had a net increase of 1.78 mm (19% relapse), first premolars 3.39 mm (26% relapse), second premolars 2.58 mm (34% relapse), and first molars 2.17 mm (20% relapse). Lip bumper treatment along with fixed appliances is an effective means to obtain long-term increases in arch width and decreases in the irregularity index. </p><hr><p></p><p> <strong> Source: </strong><strong></strong>Angle Orthodontists </p><p><a href="http://www.angle.org/doi/abs/10.1043/0003-3219%282006%29076%5B0036%3ALSOLBT%5D2.0.CO%3B2"><font color="#0000ff">  Full text</font></a> </p> Lip bumper, Retention, Stability, Arch width 0 0 http://idai.ir/browse.php?a_code=A-10-32-518&slc_lang=en&sid=1 Michael Joseph Solomon 10031947532846002118 10031947532846002118 No School of Dentistry, University of Texas, Houston, Tex Jeryl D. English jeryl.d.english@uth.tmc.edu 10031947532846002119 10031947532846002119 Yes School of Dentistry, University of Texas, Houston, Tex W. Bonham Magness 10031947532846002120 10031947532846002120 No University of Texas, School of Dentistry, Houston, Tex Chris John Mckee 10031947532846002121 10031947532846002121 No University of Texas, Houston, Tex