View clinical trials related to Mandibular Retrognathism.
Filter by:The aim of this prospective study is to analyze the postoperative paresthesias experienced in patients who undergo bilateral sagittal split osteotomies (BSSO) using an ultrasonic saw, versus a reciprocating saw. Patients included in the study are ages 15-45 scheduled to undergo BSSO surgery at the University of California, San Francisco. One side of the patient's mandible will be instrumented with either the Stryker Sonopet ultrasonic saw or traditional reciprocating saw, while the other side will receive the remaining intervention (determined via randomization on the day of surgery). Patient paresthesias will then be analyzed on each side for 3 months postoperatively (at postoperative days: 1, 7, 14, 28, and 84). Sensory examinations will be carried out by blinded examiners using von Frey hairs and two point discrimination testing. Patients will also subjectively rate their sensation on each side. The results will then be analyzed to determine if patient paresthesias, including the severity and duration, differed depending on which instrument was used, the ultrasonic or reciprocating saw.
To compare dentoskeletal changes in patients with skeletal class II malocclusion induced due to treatment with orthodontic appliances; removable twin block appliance and fixed AdvanSync2 appliance in two different age group patients.
The aim of this study is to compare to different protocols to treat Class II malocclusion in growing subjects using the twin block appliance
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.
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.
Deliberate hypotension is defined as lowering the systolic blood pressure to 80-90mmHg, or the mean blood pressure to 50-65mmHg. This technique is usually employed for operations that have a high risk of intraoperative hemorrhage, such as orthognathic surgery. Several different regimens are used to lower the patient's blood pressure, such as vasodilators, autonomic nervous system inhibitors, opioids and inhalation anesthetics. However, the effects that these agents have on the QTc and Tp-e intervals during deliberate hypotension is not known. Virtually every kind of anesthetic is reported to have some effect on the QTc and Tp-e intervals. Because orthognathic surgery usually takes 3-4 hours to complete, the amount of anesthetics and drugs used to maintain low blood pressure is not small. Therefore, the effect that these agents may have on the QTc and Tp-e intervals may not be negligible. The investigators of the present study found that the high dose of commonly used hypotensive agents tend to prolong these variabilities to some extent. This study will be able to provide insight as to which hypotensive anesthesia regimen has the least effect on the QTc and Tp-e intervals, and therefore will be helpful in minimizing cardiovascular risks of deliberate hypotensive anesthesia.