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Results for “Tooth Movement Techniques”

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At least 37 records · Page 2Linked to original sources
PubMed2003

Clinical measurement of force systems upon activation of transpalatal arch in the treatment of unilateral crossbite.

OBJECTIVES: in this study, forces and moments acting on the molars were theoretically determined by means of small-deflection analysis when an asymmetric third-order activation of the TPA was carried out. MATERIALS AND METHODS: the transpalatal arch (TPA) is used to correct unilateral crossbites through the application of buccal root torque to the anchorage molar and lingual root torque to the contralateral molar in crossbite, combined with expansion. Unfortunately, the complex force systems created at the molars upon activation of the TPA cannot be easily estimated. RESULTS: our computations revealed that the vertical forces developed on the molars when both ends of the TPA are inserted into the lingual sheaths (two-couple system) is four-times greater than those when only one end is tied to the lingual sheath as a single-point contact (one-couple system). CONCLUSIONS: we propose a method of clinical estimation of the force system in a two-couple system by directly measuring the vertical force produced by the one-couple system.

Algorithms↗
PubMed1980

Ankylosed teeth as abutments for palatal expansion in the rhesus monkey.

The maxillary permanent lateral incisors of three rhesus monkeys were intentionally ankylosed by a replantation and splinting technique. A 1-pound expansion force was applied to the ankylosed teeth for 5 to 15 weeks. The intermaxillary and interpremaxillary sutural expansion was monitored radiographically during the experimental period. Two animals were killed for histologic examination after 13 and 23 weeks, and the third animal was monitored radiographically for 21 weeks. Skeletal expansion of the maxilla was achieved without concomitant buccal tipping of the abutment teeth. Osteoid tissue was deposited on localized areas of the resorbed cementum and dentin of the ankylosed teeth. The periodontal ligament showed atrophic and degenerative changes similar to those found with increased age in human beings.

Animals↗
PubMed2004

Postpubertal assessment of treatment timing for maxillary expansion and protraction therapy followed by fixed appliances.

In this cephalometric investigation, we evaluated the correction of Class III malocclusion in subjects who had attained postpubertal skeletal maturity and considered whether treatment timing influenced favorable craniofacial modifications. All subjects (n = 50) were treated with an initial phase of rapid maxillary expansion and protraction facemask therapy, followed by a second phase of preadjusted edgewise therapy. The treated sample was divided into an early treated group (early mixed or late deciduous dentition, 33 subjects) and a late treated group (late mixed dentition, 17 subjects). Mean treatment duration times were 7 years 2 months for the early treatment group and 4 years 5 months for the late treatment group. The treated patients were matched to untreated controls (early control group, 14 subjects; late control group, 10 subjects) on the basis of race, sex, mean age at first observation, mean age at second observation, mean observation intervals, and type of malocclusion. A modified version of Johnston's pitchfork analysis, with additional angular and linear measures for mandibular size and shape and for vertical skeletal relationships, was performed. Analysis of variance was used to evaluate the difference in means for each cephalometric variable in the treated groups compared with the corresponding control groups. The findings showed that orthopedic treatment of Class III malocclusion was more effective when it was initiated at an early developmental phase of the dentition (early mixed or late deciduous) rather than during later stages with respect to untreated Class III control groups. Patients treated with rapid maxillary expansion and facemask therapy in the late mixed dentition, however, still benefited from the treatment, but to a lesser degree. Early treatment produced significant favorable postpubertal modifications in both maxillary and mandibular structures, whereas late treatment induced only a significant restriction of mandibular growth. Significant changes in mandibular size were associated with significant changes in mandibular shape only in early treated subjects. The main contribution to overall occlusal correction was related to skeletal modifications rather than dental changes in both early and late treated groups.

Adolescent↗
PubMed1992

[The initial morphological state in the basally pneumatized maxillary sinus--a radiological-histological study in man].

Twenty human autopsy specimens of the lateral maxilla with radiologically diagnosed extended basal maxillary sinus were prepared either in the horizontal, sagittal or transversal plane. Generally the cortical bone of the maxillary sinus showed a thickness up to 1000 microns. In areas with root contact histological findings could be described as follow: reduction of thickness, bone perforations, bone perforations combined with apical and or lateral root resorptions and root resorptions without bone perforations. These morphological findings could not be verified by X-ray examination.

Adult↗
PubMed1992

Vertical extrusion: literature review and report of a case.

To date, the scientific literature has documented, primarily, successful methods and techniques of treatment involving vertical extrusion. The purpose of this article is to review the literature and report on a case that demonstrates the multidisciplinary approach required to successfully manage a reversible complication involving the restoration of an adult maxillary central incisor that had sustained an oblique crown-root fracture.

Adult↗
PubMedDate not supplied

Management of cervical root perforation: report of a case.

The case reported here demonstrates, in the planning and treatment of this patient, a good example of teamwork among different dental specialities. The clinical examination of a healthy, sixteen-year- old Swedish boy produced the diagnoses of osteitis periapicalis resorptiva chronica and root perforation, after unsuccessful treatment by the school dentist who had referred the patient. Orthodontic extrusion was preferred to a surgical approach. The prosthetic treatment was completed immediately after finishing the endodontic procedures.

Adolescent↗
PubMed2004

Multidisciplinary approach to the immediate esthetic repair and long-term treatment of an oblique crown-root fracture.

This case report describes the esthetic management of a dental trauma at the first visit and its subsequent treatments to restore the esthetics and function. Today, patients expect adequate esthetics and the ability to confidently smile immediately after the first appointment. In addition, they require that esthetics is maintained throughout the definitive treatment phase as well. After the use of the fractured crown as a temporary replacement crown, an orthodontic extrusion was undertaken to restore the physiological periodontal attachment. The tooth was then splinted for 6 months and at completion of this orthodontic stage, the permanent restoration was fabricated.

Adult↗
PubMed1978

Extrusion of endodontically treated teeth.

Extrusion in a vertical direction was used in efforts to retain 14 teeth that had subcrestal fractures, perforations, or caries below the gingival tissue. Indications for the procedure, techniques, and complications are discussed.

Acid Etching, Dental↗
PubMed2001

Mandibular bone graft material for reconstruction of alveolar cleft defects: long-term results.

OBJECTIVE: To analyze the long-term effect of mandibular bone as donor material in bone grafting of the alveolar process defect in patients with unilateral cleft lip and palate (UCLP), compared with iliac crest cancellous bone. METHOD: During a 7-year period, 101 UCLP patients were bone grafted, 57 cases with iliac crest cancellous bone and 44 with mandibular symphyseal bone. The long-term results with an observation time of more than 4 years were analyzed with respect to marginal bone level and dental and gingival condition in the grafted area. Complications were recorded. RESULTS: The bone level in the grafted area was satisfactory in both groups. Impaction of cleft-side canines was found in 35% of the patients in both groups. Patients with agenesis of the cleft side lateral incisor had significantly more impacted canines, compared with patients with a cleft-side lateral situated in the lesser maxillary segment, probably due to the fact that the lateral incisors help in guiding the canine down through the grafted area. The number of complications was scarce, although both groups demonstrated some gingival retraction with a longer crown length at the cleft side central incisor. CONCLUSION: The findings of this study have changed our strategy in bone grafting. Timing of orthodontic treatment and bone grafting has been more varied depending on the position and presence of teeth in the cleft area. Bone grafting of the alveolar process is not just a local treatment of a bony defect, but in respect to the burden of treatment, bone grafting of the alveolar process has to be planned in accordance with orthodontic treatment and maxillofacial growth.

Alveolar Process↗
PubMed2000

Orthodontic, genetic, and periodontal considerations in the treatment of impacted maxillary central incisors: A study of twins.

Treatment of twins each with one impacted maxillary central incisor and a mesiodens is described. Treatment included rapid expansion, extraction of the mesiodens, surgical exposure of the impacted central incisor, and its forced eruption. The impacted incisor was brought into functional position in one patient but was lost in the other because of insufficient root length and high mobility. Orthodontic, genetic, and periodontal considerations of these 2 cases are evaluated.

Adolescent↗
PubMed2005

Tooth preparation for post-retained restorations.

Failure of root canal treatment and/or post crowns can be avoided in many cases if appropriate tooth preparation is carried out. This paper discusses the rationale for the timing of post placement following root canal treatment and appropriate methods for removal of gutta-percha prior to post space preparation. The basic principles of post space preparation are described, which should reduce the risk of weakening the root unnecessarily, causing damage to the periodontium and post perforation.

Biocompatible Materials↗