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Conference Paper: Condylar effects with stepwise mandibular advancement versus maximum jumping

TitleCondylar effects with stepwise mandibular advancement versus maximum jumping
Authors
Issue Date2006
PublisherOxford University Press
Citation
The 81st Congress of European Orthodontic Society, Amsterdam, The Netherlands, 3–7 June 2005. In The European Journal of Orthodontics, 2006, v. 28 n. 2, p. e144-e145 Abstract no.312 How to Cite?
AbstractAIM: To compare, in a prospective clinical study, condylar changes during stepwise mandibular advancement and mandibular maximum jumping. SUBJECTS AND METHOD: The headgear activator group (HGA-S) had stepwise advancement (n = 24, mean age = 11.9 ± 1.2 years) for 4 mm every 3 months with individualised bite opening following the condylar translatory pathway, whilst the HGA-M group (n = 31, mean age = 11.2 ± 1.5 years) had maximum jumping to edge-to-edge with 6 mm interincisal opening. Active treatment was 12 months (T0-T12) for the HGA-S group and 6 months (T0-T6) for the HGA-M group followed by 6 months (T6-T12) of reduced appliance wear and headgear cessation. Superior and posterior condylar changes were analysed from full mouth opening lateral cephalograms (Pancherz and Hägg, 1985) taken at the start (T0) and 6 (T6) and 12 (T12) months after treatment. The results were adjusted to the same observation lengths. Growth changes were obtained from the untreated control group, i.e. HGA-M group (10.3 ± 2.4 years) before treatment. RESULTS: There was similar sagittal condylar treatment effect with both devices during the initial (T0-T6), late (T6-T12) and total treatment (T0-T12) phases. There was no statistically significant vertical condylar effect with HGA-M during either the initial (T0-T6) or late (T6-T12) phases, whereas HGA-S resulted in a statistically significant effect during both phases. CONCLUSION: Both mandibular maximum jumping and stepwise advancement resulted in a sagittal condylar effect. However, there was a vertical condylar effect only with mandibular stepwise advancement. This indicates that the amount and frequency of bite jumping seem to be decisive factors for treatment effects on the condyles.
Persistent Identifierhttp://hdl.handle.net/10722/94676
ISSN
2015 Impact Factor: 1.44
2015 SCImago Journal Rankings: 1.090

 

DC FieldValueLanguage
dc.contributor.authorWey, MCen_HK
dc.contributor.authorHagg, EUOen_HK
dc.contributor.authorBendeus, SAMen_HK
dc.date.accessioned2010-09-25T15:38:33Z-
dc.date.available2010-09-25T15:38:33Z-
dc.date.issued2006en_HK
dc.identifier.citationThe 81st Congress of European Orthodontic Society, Amsterdam, The Netherlands, 3–7 June 2005. In The European Journal of Orthodontics, 2006, v. 28 n. 2, p. e144-e145 Abstract no.312-
dc.identifier.issn0141-5387-
dc.identifier.urihttp://hdl.handle.net/10722/94676-
dc.description.abstractAIM: To compare, in a prospective clinical study, condylar changes during stepwise mandibular advancement and mandibular maximum jumping. SUBJECTS AND METHOD: The headgear activator group (HGA-S) had stepwise advancement (n = 24, mean age = 11.9 ± 1.2 years) for 4 mm every 3 months with individualised bite opening following the condylar translatory pathway, whilst the HGA-M group (n = 31, mean age = 11.2 ± 1.5 years) had maximum jumping to edge-to-edge with 6 mm interincisal opening. Active treatment was 12 months (T0-T12) for the HGA-S group and 6 months (T0-T6) for the HGA-M group followed by 6 months (T6-T12) of reduced appliance wear and headgear cessation. Superior and posterior condylar changes were analysed from full mouth opening lateral cephalograms (Pancherz and Hägg, 1985) taken at the start (T0) and 6 (T6) and 12 (T12) months after treatment. The results were adjusted to the same observation lengths. Growth changes were obtained from the untreated control group, i.e. HGA-M group (10.3 ± 2.4 years) before treatment. RESULTS: There was similar sagittal condylar treatment effect with both devices during the initial (T0-T6), late (T6-T12) and total treatment (T0-T12) phases. There was no statistically significant vertical condylar effect with HGA-M during either the initial (T0-T6) or late (T6-T12) phases, whereas HGA-S resulted in a statistically significant effect during both phases. CONCLUSION: Both mandibular maximum jumping and stepwise advancement resulted in a sagittal condylar effect. However, there was a vertical condylar effect only with mandibular stepwise advancement. This indicates that the amount and frequency of bite jumping seem to be decisive factors for treatment effects on the condyles.-
dc.languageengen_HK
dc.publisherOxford University Press-
dc.relation.ispartofThe European Journal of Orthodonticsen_HK
dc.titleCondylar effects with stepwise mandibular advancement versus maximum jumpingen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailHagg, EUO: euohagg@hkusua.hku.hken_HK
dc.identifier.emailBendeus, SAM: sambende@hkusua.hku.hken_HK
dc.identifier.authorityHagg, EUO=rp00020en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1093/ejo/cjl019-
dc.identifier.hkuros114438en_HK

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