Stepwise advancement versus maximum jumping with headgear activator

Wey, M.C. and Bendeus, M. and Peng, L. and Hagg, U. and Rabie, A.B.M. and Robinson, W. (2007) Stepwise advancement versus maximum jumping with headgear activator. The European Journal of Orthodontics, 29 (3). pp. 283-293. ISSN 0141-5387

[img] PDF
Restricted to Registered users only

Download (443kB) | Request a copy

Download (28kB)


The aim of this study was to compare the effects of stepwise mandibular advancement versus maximum jumping and extended treatment versus early retention. The material was obtained prospectively and consisted of lateral cephalograms taken at the start (T0), after initial (T1), and at the end (T2) of treatment, from two groups of consecutively treated skeletal Class II patients who had undergone therapy with headgear activators. The first headgear activator group, HGA-S (n = 24; mean age 11.9 +/- 1.2 years), was treated for 13 months and had 4-mm mandibular advancement every 3 months. The second headgear activator group, HGA-M (n = 31; mean age 11.2 +/- 1.5 years), had maximum jumping, 6-8 mm interincisal opening, for a total of 15.4 months, and with reduced wear for the last 6.9 months. The dropout over 12 months was 41 and 46 per cent, respectively. Pre-treatment growth changes were obtained as a reference. An independent t-test was used to determine differences in baseline dentofacial morphology between the groups, a paired t-test for intra-group comparisons, and an independent t-test to evaluate differences between the groups. The results, in both groups, showed enhanced mandibular prognathism during the initial phase (T0-T1), followed by normal growth (T1-T2), and lower face height enhancement throughout treatment (T0-T2). For both groups, the mandibular plane and occlusal angle increased, possibly enhanced by 'extrusion' of the lower molars. For both groups, maxillary forward growth was restrained only during the initial phase, but the effect remained significant at T2 for the HGA-S group. In the HGA-M group, the lower incisors were protruded, while in the HGA-S group, they were unaffected. The findings indicate that both modes of mandibular jumping resulted in skeletal and dental effects. The length of active treatment seemed to be decisive in maintaining the treatment effects; stepwise advancement had less dental effects.

Item Type: Article
Additional Information: ISI Document Delivery No.: 181YB Times Cited: 2 Cited Reference Count: 39 Cited References: Altenburger E, 1998, EUR J ORTHODONT, V20, P389, DOI 10.1093/ejo/20.4.389 Banks P, 2004, AM J ORTHOD DENTOFAC, V126, P583, DOI 10.1016/j.ajodo.2004.03.024 Basciftci FA, 2003, EUR J ORTHODONT, V25, P87, DOI 10.1093/ejo/25.1.87 Bendeus M, 2002, AM J ORTHOD DENTOFAC, V121, P376, DOI 10.1067/mod.2002.122177 BJORK A, 1947, FACE PROFILE ANTHR X Bookstein F L, 1997, Med Image Anal, V1, P225, DOI 10.1016/S1361-8415(97)85012-8 BRANDAO M, 2006, AM J ORTHOD DENTOFAC, V129, P230 Chayanupatkul A, 2003, EUR J ORTHODONT, V25, P465, DOI 10.1093/ejo/25.5.465 DERMAUT L R, 1992, European Journal of Orthodontics, V14, P140 Du X, 2002, EUR J ORTHODONT, V24, P167, DOI 10.1093/ejo/24.2.167 Ghafari J, 1998, Clin Orthod Res, V1, P107 GRABER TM, 1997, DENTOFACIAL ORTHOPED HAGG U, 2003, SEMIN ORTHOD, V9, P57, DOI 10.1053/sodo.2003.34025 Hagg U, 2002, AM J ORTHOD DENTOFAC, V122, P477, DOI 10.1067/mod.2002.128218 Haralabakis NB, 2003, AM J ORTHOD DENTOFAC, V123, P296, DOI 10.1067/mod.2003.20 Illing HM, 1998, EUR J ORTHODONT, V20, P501, DOI 10.1093/ejo/20.5.501 JAKOBSSON SO, 1990, EUR J ORTHODONT, V12, P174 Keeling SD, 1998, AM J ORTHOD DENTOFAC, V113, P40, DOI 10.1016/S0889-5406(98)70275-6 Lau JWP, 1999, BRIT DENT J, V186, P188, DOI 10.1038/sj.bdj.4800059a Meikle MC, 2005, EUR J ORTHODONT, V27, P105, DOI 10.1093/ejo/cji038 NELSON C, 1993, AM J ORTHOD DENTOFAC, V104, P153, DOI 10.1016/S0889-5406(05)81005-4 O'Brien K, 2003, AM J ORTHOD DENTOFAC, V124, P234, DOI 10.1016/S0889-5406(03)00352-4 O'Brien K, 2003, AM J ORTHOD DENTOFAC, V124, P128, DOI 10.1016/S0889-5406(03)00345-7 OMBLUS J, 1997, EUR J ORTHODONT, V19, P85 PANCHERZ H, 1990, EUR J ORTHODONT, V12, P209 PANCHERZ H, 1985, AM J ORTHOD DENTOFAC, V88, P273, DOI 10.1016/0002-9416(85)90126-5 Pancherz H, 2004, AM J ORTHOD DENTOFAC, V126, P153, DOI 10.1016/j.ajodo.2003.07.015 PANCHERZ H, 1979, AM J ORTHOD DENTOFAC, V76, P423, DOI 10.1016/0002-9416(79)90227-6 Pancherz H, 1982, Swed Dent J Suppl, V15, P189 PANCHERZ H, 1986, EUR J ORTHODONT, V8, P215 PANCHERZ H, 1982, AM J ORTHOD DENTOFAC, V82, P104, DOI 10.1016/0002-9416(82)90489-4 Phan KLD, 2006, EUR J ORTHODONT, V28, P594, DOI 10.1093/ejo/cjl052 Rabie ABM, 2003, ANGLE ORTHOD, V73, P457 Rabie ABM, 2003, AM J ORTHOD DENTOFAC, V123, P40, DOI 10.1067/mod.2003.45 Ruf S, 2001, ANGLE ORTHOD, V71, P4 Tulloch JFC, 1998, AM J ORTHOD DENTOFAC, V113, P62, DOI 10.1016/S0889-5406(98)70277-X VANBEEK H, 1982, EUR J ORTHODONT, V4, P279 WIESLANDER L, 1993, AM J ORTHOD DENTOFAC, V104, P319, DOI 10.1016/S0889-5406(05)81328-9 Wong GWK, 1997, EUR J ORTHODONT, V19, P195, DOI 10.1093/ejo/19.2.195 Wey, Mang Chek Bendeus, Margareta Peng, Li Haegg, Urban Rabie, A. Bakr M. Robinson, Wayne Oxford univ press Oxford
Uncontrolled Keywords: Class-ii malocclusions twin-block appliances herbst appliance long-term controlled-trial condylar growth clinical-trial skeletal bite orthopedics
Subjects: R Medicine > RK Dentistry
Divisions: Faculty of Dentistry > Dept of Children’s Dentistry And Orthodontics
Depositing User: Mr Ahmad Azwan Azman
Date Deposited: 11 Jan 2013 02:01
Last Modified: 11 Jan 2013 02:01

Actions (login required)

View Item View Item


Downloads per month over past year