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AIM: To compare changes in overjet and jaw base relationship during treatment and follow-up ofskeletal Class II malocclusion subjects.MATERIALS AND METHOD: A series of lateral cephalograms obtained from a group ofconsecutive male patients treated with headgear-activator (RFA) for 12 months was compared with amatched group treated with a Herbst appliance for 6 months, followed by ‘retention’ with an Andresenactivator for six months (FFA). The patients were then followed for a further 24 months. Lateralcephalograms were obtained at start of treatment, after 6 and 12 months of treatment, and after another24 months, and analysed (Pancherz, 1982). Interpolations were made to obtain data representingexactly the same length of observations periods.RESULTS. During the initial 6 months of treatment the jaw base relationship improved significantlymore in the FFA than the RFA group; the difference of 1.5 mm being statistically significant (P <0.05). After 12 months of treatment (RFA) and treatment and retention (FFA), there was nosignificant difference in the change of jaw base relationship between the two groups, and neither so at24 months follow-up. After 6 months of treatment the overjet reduction was 5.7 mm greater (P <0.001) in the FFA group than in the RFA group. At 12 months the RFA group showed a continuedreduction in overjet whereas relapse occurred in the FFA group, the difference of 3.4 mm wasstatistically significant (P < 0.001). At the 24 month follow-up the difference in overjet change was1.6 mm (ns).CONCLUSION: The FFA seems to offer only short-term advantages with regard to changes inoverjet reduction and jaw base relationship compared with the RFA. The observed superiority in theinitial phase did not persist long-term.link_to_subscribed_fulltex

Abstracts of Lectures and Posters from the European Orthodontic Society 81st Congress at Amsterdam, The Netherlands 3–7 June 2005