Modified Orthodontic Bone Stretching for Ankylosed Tooth Repositioning: A Case Report.

Background: Different approaches were proposed in the literature for the treatment of malpositioned ankylosed teeth. The present case report describes a modification of Orthodontic Bone Stretching Technique (OBS) for the repositioning of ankylosed teeth, consisting of dentoalveolar segmental osteotomies performed with piezoelectric instruments followed by orthodontic and orthopedic traction. Case Report: A 22-year-old female in good general health was referred by her orthodontist due to an infraoccluded and ankylosed maxillary upper left canine. Attempts of conventional and corticotomy-assisted orthodontic alignment of the tooth were previously performed with no success. After elevating a full-thickness flap, three osteotomies were performed by using piezoelectric inserts (Piezotome Cube, Acteon, Merignac, France). Mesial and distal cuts were full-thickness osteotomies, parallel to the long axis of the tooth, through the buccal and palatal cortical plates. The apical osseous incision was a horizontal corticotomy, involving only the buccal plate, and connecting the vertical osteotomies two millimetres over the apex of the tooth. Heavy orthodontic forces were immediately applied by using both dental and skeletal anchorage. The initial movement of the dentoalveolar segment was observed three weeks after surgery and case finishing has been completed in two months. At a one-year follow-up, the repositioned canine showed good periodontal conditions, no discoloration and positive pulp response to the electric test. Conclusion: Modified OBS technique was effective in repositioning an infraoccluded and ankylosed maxillary canine, providing satisfactory function and esthetics with short treatment time.

Treatment of traumatic knee stiffness with Ilizarov stretcher

Objective To explore the clinical application of Ilizarov stretcher in the treatment of traumatic knee joint stiffness, and to compare the efficacy of soft tissue release around knee joint with CPM machine exercise. Methods In this study, 36 patients with ankylosis after operation for periarticular fracture from March 2012 to March 2017 were treated with Ilizarov stretcher after soft tissue lysis. The therapeutic effect was excellent. Results According to Judet method, the knee joint function was evaluated in the experimental group: excellent in 22 cases, good in 12 cases, fair in 2 cases, the excellent and good rate was 94.4%; in the control group, excellent in 3 cases, good in 18 cases, fair in 12 cases, the excellent and good rate was 63.6% Conclusions Ilizarov stretcher is an effective method for the treatment of traumatic knee joint stiffness, which has the advantages of short treatment time and good function of knee joint after operation.

Synthesis of Binderless ZK-4 Zeolite Microspheres at High Temperature

Binderless zeolite macrostructures in the form of ZK-4 microspheres were prepared using anion-exchange resin beads as shape-directing macrotemplates. The particles were synthesized under hydrothermal conditions at different temperatures and treatment times. The influence of the different synthesis parameters was investigated by X-ray diffraction, scanning electron microscopy, fluorescence X, nitrogen adsorption measurements and 29Si solid-state NMR. Fully crystalline spheres similar in size and shape to the original resin beads were obtained by a hydrothermal treatment at the highest temperatures (150–180 °C) for a short treatment time of 24 h. The synthesized microspheres showed to be promising in the molecular decontamination of volatile organic compounds (VOCs).

Treatment of Class I Malocclusion with a Lower Incisor Extraction: A Case Report

A case report is presented with Class I malocclusion, moderate lower anterior crowding, maxillary dental midline shift with missing right lateral incisor. The adult orthodontic case was treated comprehensively with the extractions of lower lateral incisor, and upper and lower left first premolars as the balancing extraction. Remarkable improvements were achieved in facial profile, axial anterior inclination, esthetic smile and midline correction in short treatment time. Thus, it is concluded that lower incisor extraction in moderate lower anterior crowding and midline shift yield better and stable results with minimal intervention in select cases.

Synthesis of Binderless ZK-4 Zeolite Microspheres at High Temperature

Binderless zeolite macrostructures in the form of ZK-4 microspheres were prepared using anion exchange resin beads as shape directing macrotemplates. The particles were synthesized under hydrothermal conditions at different temperatures and treatment times. The influence of the different synthesis parameters was investigated by X-ray diffraction, scanning electron microscopy, fluorescence X, nitrogen adsorption measurements and 29Si solid NMR. Fully crystalline spheres similar in size and shape to the original resin beads were obtained by a hydrothermal treatment at the highest temperatures (150 - 180 °C) for a short treatment time of 24 h. The synthesized microspheres showed to be promising in the molecular decontamination of Volatile Organic Compounds (VOCs).

Research Status of High-Intensity Pulsed Electric Field (PEF) Equipment and its Application on Food Processing

Due to short treatment time, the quality change of food caused by heat can be reduced, high-intensity pulsed electric field (PEF) has been widely used, especially in food industry. PEF system consists of PEF generator, treatment chamber, pump, cooling coil, container and monitoring system. The research status of PEF generator, pulses waveforms, treatment chamber and electrodes were discussed. And the application of PEF on food processing was summarized.

Mechanical Flow Restoration in Acute Ischemic Stroke: A Model System of Cerebrovascular Occlusion

Stroke is the leading cause of disability and the third cause of death in the United States. About 20% of acute ischemic strokes (AIS) are caused by a large artery occlusion, and restoration of blood flow in a reasonable time is the principle goal of treatment. FDA-approved recombinant tissue plasminogen activator (tPA) administration for treatment of stroke is efficacious, but it has short treatment time window and risk of symptomatic hemorrhage that result in only 3–5% patients of who receive this treatment. Alternatively, endovascular treatment using thrombectomy devices, MERCI and Penumbra systems, has been cleared by the FDA. Without adjunctive therapies, the recanalization rate and clinical outcome associated with these devices could be improved.