View clinical trials related to Malocclusion, Angle Class II.
Filter by: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 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 present day social setup considers facial charisma as an important physical characteristic. The facial characteristics of an individual are measured through anthropometry, photogrammetry, computer imaging and cephalometric radiographs. Cephalometric radiographs offer significant diagnostic information regarding the association between the dental and skeletal structures. By means of photogrammetric measurements, a fresh diagnostic resource is accessible to the orthodontist which permits an intangible, radiation free attainment of measure points of soft tissue with no instrumental expense and radiation to the patient. Orthodontic patients range from adolescents to senior citizens and originate from an assortment of populations, thus an extensive series of representative norms will be ideal. Knowledge of the normal dentofacial outline of every group will make certain better success of treatment to set up the best possible facial agreement. Hence, it is extremely important to assess the soft tissue profile of a patient as it is one of the most vital components of orthodontic diagnosis and treatment planning. The purpose of the present study is to evaluate the photographic characteristics of soft tissue facial profile of patients with class II malocclusion as ethnic differences have been found to be reported in the literature. It is hypothesized that soft tissue facial characteristics on lateral profile photographs and lateral cephalometric radiographs in a sample of local population with class II malocclusion are closely related.
The current trial was designed to investigate the possible initial net skeletal and dental effects of treatment with FLMGM by a comparative evaluation of treated and untreated Cl II/1 malocclusion subjects. The null hypothesis stated that there were no significant differences in dentofacial changes between FLMGM group and control group.
Class II malocclusion (mismatch between the upper and lower jaw in which the lower jaw appears to be smaller from a profile point of view) are common in the general population. Around 1/3 of the population have some degree of this skeletal/dental problem and it is one frequent reason why patients decide to undergo orthodontic treatment. Treatment alternatives will basically depend on the facial skeletal development of the patient and also on the magnitude of the skeletal/dental discrepancy. For patients that are not yet fully skeletal mature, the treatment of mild to moderate Class II malocclusion involves a combination of a small skeletal growth modification effect and more significant dental movements. For skeletal mature individuals with a severe mismatch, the treatment usually involves jaw surgery to fully correct the malocclusion. For less severe cases orthodontic camouflage exclusively done by orthodontic movements is an option. If the case is not severe enough to warrant a surgical approach there are several treatment alternatives. One of the most commonly used options is the use of orthodontic loaded springs that apply forces through brackets and arch wires bonded into the teeth so that the teeth will interrelate better. A different alternative was proposed some years ago. The Xbow (spelled Crossbow) appliance differs from the above-proposed option in that no brackets are bonded or arch wires used. The orthodontic springs are applied to a metal framework cemented on some upper and lower teeth. Once the skeletal/dental problem is believed to have been significantly improved, fine tuning of the remaining dental problems is managed with brackets and arch wires. The theoretical advantage of such a design is that adverse effects, such as root resorption and decalcification from the long-term use of brackets and arch wires, are theoretically minimized as the brackets and arch wires have to be used for a shorter period of time. Although there are some retrospective reports about the skeletal and dental effects of the Xbow appliance and only one prospective trial comparing the skeletal and dental changes to a non-treated growing sample; no randomized clinical trial has yet evaluated the changes compared to a current standard of care alternative which is the simultaneous use of loaded springs concurrent with brackets and arch wires.