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Results for “Tooth Movement Techniques”

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At least 55 records · Page 3Linked to original sources
PubMed2005

Cleidocranial dysplasia: diagnostic criteria and combined treatment.

Cleidocranial dysplasia (CCD) is an uncommon, generalized skeletal disorder characterized by delayed ossification of the skull, aplastic or hypoplastic clavicles, and serious, complex dental abnormalities. There are many difficulties in the early diagnosis of CCD because a majority of the craniofacial abnormalities becomes obvious only during adolescence. In the present case, a hypoplastic midface, a relative prognathia of the mandible, and close approximation of the shoulders in the anterior plane were the conspicuous extraoral findings. Prolonged exfoliation of the primary dentition, unerupted supernumerary teeth, and the irregularly and partially erupted secondary dentition produced occlusional anomalies. The presence of the second permanent molars together with the primary dentition and wide spacing in the lower incisor area were typical dental signs. Gradual extraction of the supernumerary teeth and over-retained primary teeth was the first step of oral surgery. This was followed by a surgical exposure of the unerupted teeth by thinning of the cortical bone. Orthodontic treatment was aimed at parallel growth of the jaws. Removable appliances were used to expand the narrow maxillary and mandibular arches, and a Delaire mask compensated for the lack of sagittal growth of the upper jaw. Temporary functional rehabilitation was solved by partial denture. When the jaws have been fully developed, implant insertions and bridges are the therapeutic measures. The reported case and the literature data support the importance of the early diagnosis and interdisciplinary treatment of CCD.

Adolescent↗
PubMedDate not supplied

Management of median diastema.

In mixed and early permanent dentitions, median diastema can be a major esthetic concern for patients and/or their parents. The space can be transient or created by developmental, pathological, or iatrogenic factors. Different treatment techniques have been proposed to manage the situation. This paper reviews the common causes of median diastema and presents four cases to illustrate a range of restorative and orthodontic options.

Adolescent↗
PubMed1995

Treatment and prognosis of a vertically fractured maxillary molar with widely separated segments: a case report.

This is a report of the treatment and prognosis of a maxillary second molar exhibiting a complete vertical crown-root fracture. The buccal and palatal segments were widely separated by as much as 2 mm and were immobile. To restore this tooth, it was essential to bring the segments into close apposition. This was accomplished by application of orthodontic elastics to the tooth crown in combination with a wire splint. After approximately 1 month of continuous use of the orthodontic elastics, the dislodged segments were suitably repositioned close to their original positions. The tooth was then endodontically treated and restored with a cast complete crown. The restored tooth has been functioning well, with periodic periodontal maintenance, for more than 3.5 years, indicating a promising prognosis.

Adult↗
PubMed1996

[Tooth movement by biomechanical technique in orthodontic treatment].

The purpose of this study was to analyze tooth movement by measuring the electric impedance of the wire and by using the nonlinear finite element analysis. In this study, the HP4338A Milliohmmeter was used and the model consisted of a metal tooth, silicone bath, bracket, and orthodontic wire. Then, the two-dimensional finite elements were used and the model consisted of tooth, periodontal ligament, alveolar bone, bracket, and orthodontic wire. There were two analyses. The first was the contact nonlinear finite element analysis of elastic deformation in the displaced tooth at the slide points between the bracket and wire where two gap element areas existed, and the second was the material nonlinear finite element analysis of the stress relaxation in bone at the fixing points between the bracket and wire where two rigid element areas, differing from the gap element areas, existed. The results were as follows: 1. The linear proportion between the electric impedance and the orthodontic wire was found. Therefore very minute tooth movements became measurable with changes of the wire electric impedance. 2. During tooth movement, the stick between the bracket and the wire altered with the slip ones repeatedly. 3. The movement of the displaced tooth at the center of rotation was counterclockwise. 4. The movement of the displaced tooth at the bracket position was clockwise.

Biomechanical Phenomena↗
PubMed2005

Dental team management for a patient with cleidocranial dysostosis.

Cleidocranial dysostosis is a rare autosomal condition that affects ossification. The dental abnormalities associated with it present a remarkable challenge in orthodontic treatment planning. Early diagnosis is extremely important to give the patient the best treatment options. Patients with cleidocranial dysostosis require a team approach with good communication and cooperation from the patient. Timing of the intervention is critical, and many surgeries might be required. The patient in this report was treated with a team effort that involved several dental specialties to achieve an optimal result.

Child↗
PubMed1999

Surgically assisted rapid palatal expansion: orthodontic preparation for clinical success.

Close root proximity between the maxillary central incisors presents a problem in the surgical management of a maxillary palatal expansion. During the surgical fracture of this interdental area, the possibility exists for a separation to occur between the root surface and the bone. If this does occur, it is paramount that the gingival attachment remain intact. Asymmetric separation places more stress on the mesial gingival attachment because of the anatomy of the gingival fiber apparatus. Gingival detachment results in epithelial downgrowth in an apical direction, which in turn prevents bone apposition in a coronal direction. The resulting osseous defect is difficult to treat with an osseous graft procedure, as there are few if any intrabony walls. Treatment planning should include analysis of a recent periapical radiograph of the incisor roots to determine the need for orthodontic root separation before surgery. A postsurgical periapical radiograph should be taken to determine where the interdental separation has occurred. The expansion schedule should be adjusted depending on the symmetry of the separation and the health of the gingival attachment.

Adult↗
PubMed2005

Validation of two-dimensional measurements of root resorption craters on human premolars after 28 days of force application.

The aims of this study were to develop a three-dimensional (3D) mathematical model of a typical root resorption crater and to correlate two-dimensional (2D) surface area measurements to 3D volumetric measurements of root resorption craters created under light and heavy orthodontic forces. Data were obtained from a previous study of 36 first premolars from 16 subjects requiring extraction of these teeth as part of their orthodontic treatment. Buccal tipping forces of 25 or 225 g were applied for an experimental period of 28 days. After extraction, the samples were prepared for scanning electron microscopy (SEM) imaging, image processing and analysis. Surface area (2D) and volumetric (3D) measurements of all craters were obtained. A mathematical analysis of the 2D/3D relationship enabled the determination of an appropriate digital model for the shape, type and dimensions of resorption craters, which was also able to distinguish between a 'hemispheric' model versus a 'layered' model of craters. The results demonstrated that 2D and 3D measurements were strongly correlated (r = 0.991**). Within the light and heavy force groups, the measurements were also strongly correlated (r = 0.978** and r = 0.994**, respectively). For a 28 day experimental period, 2D measurements of root resorption craters were found to be as reliable as 3D measurements.

Adolescent↗