fa Stability of quad-helix/crib therapy in dentoskeletal open bite: A long-term controlled study ارتودنسی Orthodontics پژوهشي Research <p> <strong>Introduction</strong></p><p>  The purpose of this study was to evaluate the long-term stability of quad-helix/crib treatment in subjects with dentoskeletal open bite. <strong></strong></p><p> <strong>Methods</strong></p><p>  Twenty-eight subjects (11 boys, 17 girls mean age, 8.2 ± 1.3 years) were treated consecutively with quad-helix/crib appliances. The patients were reevaluated at the end of active treatment with the quad-helix/crib (mean age, 9.7 ± 1.6 years) and at least 5 years after the completion of treatment (mean age, 14.6 ± 1.9 years). A control group of 20 untreated subjects with the same dentoskeletal disharmony was used for the statistical comparison (Mann-Whitney U test). </p><p> <strong>Results</strong></p><p>  In the long term, the quad-helix/crib group showed a significant reduction in the ANB angle (−1.3°), a downward rotation of the palatal plane (1.8°), a greater increase in overbite (2.1 mm), and a decrease in overjet (−1.5 mm) when compared with the controls. </p><p> <strong>Conclusions</strong></p><p>  In the long term, the use of the quad-helix/crib appliance led to successful outcomes in about 93% of the patients considered. Correction of dentoskeletal open bite was associated with a clinically significant downward rotation of the palatal plane. </p><hr><p></p><p> <strong>Source: </strong>American Journal of Orthodontics & Dentofacial Orthopedics </p><p><a href="http://www.ajodo.org/article/S0889-5406(13)00118-2/abstract" target="_blank"><font color="#0000ff"> Full Text</font></a></p> 0 0 http://idai.ir/browse.php?a_code=A-10-32-1788&slc_lang=fa&sid=1 Manuela Mucedero 10031947532846008425 10031947532846008425 No Department of Orthodontics, University of Rome “Tor Vergata,” Rome, Italy Lorenzo Franchi 10031947532846008426 10031947532846008426 Yes Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Mich Veronica Giuntini 10031947532846008427 10031947532846008427 No Department of Orthodontics, Università degli Studi di Firenze, Firenze, Italy Andrea Vangelisti 10031947532846008428 10031947532846008428 No Department of Orthodontics, Università degli Studi di Firenze, Firenze, Italy James A.McNamara 10031947532846008429 10031947532846008429 No Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Mich Paola Cozza 10031947532846008430 10031947532846008430 No Department of Orthodontics, University of Rome “Tor Vergata,” Rome, Italy