View clinical trials related to Malocclusion, Angle Class II.
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The correction of a deep overbite is assumed to involve incisor intrusion and the extrusion or eruption of premolars and molars. The latter is also assumed to be the major contributor for growing patients where the vertical facial growth increase accommodates for the additional eruption of posterior teeth with anterior bite plane appliances. In this study the nature and rate of adaptation of the occlusal changes following insertion of a fixed anterior bite plane for the reduction of a deep overbite in growing patients will be investigated.
Thirty six patients needs therapeutic extraction of the maxillary first premolars with subsequent retraction of the maxillary canines will be divided randomly into two groups : piezocision group and the ER:yttrium aluminum garnet (YAG) laser group. In each group, piezocision or hard laser-assisted flapless corticotomy will randomly assigned to one side of the maxillary arch at the first premolar region, and the other side served as the control. Canine retraction will be initiated after completion of the leveling and alignment phase via closed nickel-titanium coil springs applying 150 g of force per side, soldered trans-palatal arch will be used as an anchor unit. Pre- and post distalization dental casts will be evaluated to study rate of canine distalization, canine rotation and anchorage loss over a follow-up period until a Class I canine relationship is achieved. The levels of pain and discomfort will be self-reported using a questionnaire with visual analog scales administered at four assessment times during the first month after the minimally invasive procedure.
The purpose of this study is to provide evidence on the effectiveness, the efficiency and efficacy of Peizo-Corticission in accelerating orthodontic tooth movement and reducing orthodontic treatment time.
The purpose of this study is to determine if the Forsus Fatigue resistant Device appliance with direct skeletal mini plates anchorage is capable of achievement of skeletal mandibular effects while preventing the excessive proclination of the lower incisors at the end of the treatment when compared to the conventional Forsus Fatigue resistant Device appliance applied to the upper and lower dental arches in female patients with skeletal Class II malocclusion
The aim of the study is to perform a three-dimensional (3D) evaluation of the dentoskeletal changes in pubertal Class II malocclusion subjects treated with the Herbst appliance (HAG), in comparison with a Class II comparison group (CG). 3D virtual models generated from three time-point CBCTs (T0, baseline; T1, immediately after Herbst insertion; and T2, 8 months after) of 25 HAG patients will be evaluated. Virtual models obtained from 25 Class II malocclusion patients, in the same stage of biologic maturation and skeletal abnormality, but with no orthopedic treatment will be constructed for the CG subjects. These CG patients are under orthodontic treatment, but only with teeth alignment. Voxel based registration on the anterior cranial fossa will be used to assess maxillary and mandibular displacement/articular fossa remodeling; regional registration on the mandibular corpus will be performed to evaluate mandibular growth and mandibular dental changes; and regional registration on the anterior region of the maxilla will be performed to evaluate maxillary growth and maxillary dental changes.
Herbst appliance is one of the most popular fixed functional appliances to treat orthodontic patients with small lower jaws. Since small lower jaws are reported to be one of the main reasons to induce sleep disordered breathing(SDB) of children, Herbst appliance can be used to treat SDB children. Previously no study compared the effects of Herbst appliance therapy with removable functional appliance on airway dimension, so it still remains unclear which kinds of functional appliance is more suitable for improving airway dimension. This study will assess the effect of Herbst appliance on airway dimension and compare the effects with those of twin block appliance (a popular 24 hours used removable functional appliance, and also commonly used to treat adult sleep apnea).
The aim of this prospective, multicentric, randomized, open-label study is to assess the efficacy of the removable Twicare® as mandibular propulsive appliance in children aged from 7 to 12 years old in the course of their orthodontic treatment, showing its noninferiority with the removable Herbst. One untreated group will be included to control the internal validity of the study as recommend in noninferiority trials. Patients will have a follow-up every two months during 6 to 12 months as planned in routine care.
The purpose of this study is to determine if the Herbst appliance with indirect skeletal anchorage in mini-implants is capable of preventing excessive inclination of the lower incisors at the end of the treatment when compared to the Herbst appliance with dental anchorage and Twin-Block appliances in patients with Class II malocclusion and overjet ≥ 6 mm.
The aim of this longitudinal randomized investigation is to determine the long-term effects of early headgear treatment on craniofacial structures and dental arches, compared to treatment started later, during the most active growth period in Class II patients. The aim was further to find out the possible benefits and the burden of early treatment to the patients and parents of these common malocclusions, when compared to groups treated later, but with the same methods as much as possible. The hypothesis is that the timing of treatment has significant effects on orthodontic treatment total time, the general outcome of the treatment, and the compliance of the patient.