Introduction: Many Class II mandibular deficiency growing patient have deep bite malocclusion. The early intervention by only correcting the vertical problem to treat has not been thoroughly examined in the orthodontic literature via well designed controlled trials. The aim of the current research was to investigate the possible effects of early bite opening in growing Class II patients.
Materials and Methods: A total of 40 growing Class II patients with deep overbites were equally and randomly distributed into 2 groups, treatment and control. The treatment group was treated by intrusion of the upper anterior segment by the use of segmented approach where the anchorage unit of the intrusive force was accomplished by the aid of 2 labial mini-screws applied between the upper central and lateral incisors on both sides. The results were extracted using Cone Beam Computed Tomography images.
Results: Concerning the TMJ There was a significant increase in the anterior mandibular joint space and the condyle was posteriorly repositioned in the treatment group. As for the skeletal growth, the treatment led to a significant increase in mandibular effective length and body length in the treatment group than the control group. Also The chin point moved forward significantly. Dentally there was a significant intrusion of the upper incisors and extrusion of the lower incisors.
Conclusions: The early treatment of deep bite in growing Class 2 deep bite patients, by upper incisors intrusion, had an influential effect on changing the growth of the TMJ and the mandibular skeletal structures.