Active clinical trials for "Retrognathia"

Research studies continues to attempt testing modifications to refine the treatment protocols through computer assisted design or computer-generated surgical Wafer splints, have greatly revolutionized the incorporation of digital imaging and 3D design in Orthognathic surgery. Integrating computer guided technology in orthognathic surgery aims to to simplify workup and reduce surgical errors, eliminate occlusal discrepancy, increase the realignment accuracy of the distal segments according to the preoperative plan. Implementing a waferless technique raised the question of efficiency versus the use of occlusal wafers and whether it has a significant measurable effect on the surgical outcome and objectives. Rationale for conducting this study is to assess the difference between the effect of computer guided waferless technique and computer guided technique with occlusal wafer on accuracy of postoperative occlusion and condylar position. .

The aim of this study will be directed to the assessment of dentoskeletal effects concomitant with skeletally anchored maxillary protraction in orthodontic skeletal Class III patients.

Aim of the study: To compare radiographically the morphometric changes in the nasal airway after using three types of rapid maxillary expansion (RME) conventional hyrax (CH), hybrid hyrax (HH) and maxillary skeletal expander (MSE) using cone beam computed tomography (CBCT).

The bilateral sagittal split osteotomy (BSSO) of the mandible is one of the most used surgical techniques to achieve a harmonious jaw relation in the context of orthognathic surgery. Nevertheless, one of its main complications is neurosensory damage to the inferior alveolar nerve, which can cause severe impact in the quality of life on patients who suffer from it permanently. The purpose of this randomized clinical trial is to provide rigorous scientific evidence of the pharmacological effect of 1) Melatonin, 2) combination uridine triphosphate (UTP), cytidine monophosphate (CMP), and hydroxycobalamin (UTP/CMP/hydroxycobalamin) and 3) hydroxycobalamin regarding neurosensory disturbances incidence and persistence after BSSO.

Background: Some head and facial abnormalities are rare and present at birth. Others are more common, and may not show up until puberty. These conditions have different causes and characteristics. Researchers want to learn more about these conditions by comparing people with face, head, and neck abnormalities to family members and to healthy volunteers without such conditions. Objectives: To learn more about abnormal development of the face, head, and neck. To determine their genetic variants. Eligibility: People who have not had surgery for facial trauma: People ages 2 and older with craniofacial abnormalities (may participate offsite) Unaffected relatives ages 2 and older Healthy volunteers ages 6 and older Design: Participants will be screened with medical history and physical exam focusing on head, face, and neck Participants may be followed for several years. Visits may require staying near the clinic for a few days. A visit is required for the following developmental stages, along with follow-up visits: Age 2-6 Age 6-10 Age 11-17 Age 18 and older Visits may include: Medical history Physical exam Questionnaires Oral exam Blood and urine tests Cheek swab: a cotton swab will be wiped across the inside of the cheek several times. Cone beam CT scan (CBCT): x-rays create an image of the head, face, teeth, and neck. Participants will stand still or sit on a chair for about 20 minutes while the scanner rotates around the head. Photos of the head and face Offsite participants will provide: Copies of medical and dental records Leftover tissue samples from previous surgery Blood sample or cheek swab

The correction of Class II malocclusion is one of the most common problems facing the orthodontist, with an estimated one-third of all orthodontic patients treated for this condition. Many strategies are available for Class II treatment on growing patients, and most orthodontists tend to choose a treatment protocol based on what part of the craniofacial deformity they believe the appliance will affect the most. A number of authors have described the dentoalveolar and skeletal changes induced by the Herbst appliance. The dentoalveolar effects consist of distalization of the maxillary molars and forward movement of the mandibular dentition. The main skeletal change "mandibular stimulation" is acceleration of a patient's inherent mandibular growth rather than increased growth beyond what would occur without treatment. Maxillary molar distalization, is one of the Class II treatment. Mini-implants have become popular in recent years, and various kinds of mini-implant-borne distalization approaches have been described. Because Class II correction appears to be achievable with either appliance, a follow-up question is whether there is a difference in the esthetic outcomes. However, because of the complexity of the human face and the subjectivity of facial beauty, a simple set of measures of lines or angles cannot quantify facial beauty. With the advances in 3-dimensional imaging, it is now possible to capture and superimpose digital images and measure the changes in the soft tissues from 3-dimensional images. Such advances in facial imaging allow a more thorough investigation of changes in 3 dimensions and prevent the inherent loss of information that results from 2-dimensional imaging. Optical scanners with short shutter speeds are convenient for clinicians and patients for capturing soft-tissue records. Bearing in mind that the aim of orthodontic treatment is to achieve facial harmony along with excellent occlusion, one of the most important objectives of an orthodontist should be the improvement of facial appearance. Therefore, it is important to gain a better understanding of how or whether orthodontic procedures affect the appearance of the soft tissues. Thus, the aim of this clinical trial is three dimensional evaluation of soft tissue facial changes on late mixed dentition patients following maxillary arch distalization with palatal screws one group and acrylic split herbst patients on other group and to compare these changes.

This study aims at evaluating the effects of mandibular advancement on pharyngeal airway space and nocturnal breathing in children with skeletal class II division1 malocclusion. Fifty patients will be enrolled in the study divided into control and experimental groups.

Patients with class II malocclusion and retrognathic mandibles will be treated using functional appliances and asses the remodeling that is expected to occur in the temporomandibular joint (TMJ) using cone-beam computed tomography (CBCT) images and we will register mandibular movements using electronic axiograph ( a specific apparatus used to record jaw movements in three dimensions). There are three groups : Activator Group Twin block Group Control Group with no treatment. Patients will be allocated to the three groups randomly. Data will be collected using three different approaches: CBCT images before treatment and 12 months after treatment Axiograph registrations before treatment and 12 months after treatment

Diverse viewpoints exist regarding the correlation between the conventional rapid maxillary expansion (RME) and facemask approach and the alternative RME and facemask hybrid technique (Alt-RAMEC) in terms of the degree of maxillary protraction. The findings of the study may offer a novel approach to protocol selection based on the anomaly's degree of severity. The objective of this investigation is to assess and contrast the skeletal and dentoalveolar outcomes of three distinct Alt-RAMEC techniques.

patients were enrolled by the inclusion criteria and were undergo lefort 1 maxillary osteotomy. after the latency phase the distraction was done in anterior- posterior vector. patients were divided by randomized allocation in 2 groups. in group 1 the distractor was removed after consolation phase, and in group 2 fixation devices were placed immediately after removal of distractors. data regarding relapse were analyzed by lateral cephalogram X-ray taken in 3 different phases of the trial. change of occlusal plane and the "A point" of the cephalometric analysis were determined as reference point of the study.