The 3D CBCT analysis of dentoskeletal changes in Class II pubertal patients treated with removable, fixed and bone-anchored functional appliances have not been previously investigated. This presentation will answer the following questions: Which were the 3D effects of the Twin-Block, Herbst and bone-anchored Herbst appliances on the position of the maxilla, mandible, central incisors and 1st molars in Class II patients during the peak of pubertal spurt? Were the predominant effects dental or skeletal? Was there a difference of amount of overjet and molar correction among the 3 types of appliances?
Learning Objectives:
After this session, attendees will be able to:
Show that the effects of Twin-Block, Herbst and bone-anchored Herbst were predominantly skeletal in Class II patients treated in the peak of pubertal spurt.
Demonstrate that the main dental effect in the 3 groups was the mesialization of lower 1st molars (1.0-1.7mm). The projection of lower incisors was lower than 1 mm in all 3 groups. There was a minimal movement of upper incisors and 1st molars in the 3 planes of space, lower than 1mm.
Show that the bone-anchored Herbst had the highest efficacy in Class II treatment, with anteroposterior mandibular growth (4.2mm) greater than the Herbst (3.5mm) and Twin Block (1.3mm) after 1-year treatment in the peak of pubertal spurt.
