Excellent Combination of Tensile ductility and strength due to nanotwinning and a biamodal structure in cryorolled austenitic stainless steel.

Austenitic stainless steels are prominent materials for their superior corrosion resistance and a combination of strength and ductility. However, the relatively low yield strength limits its application in high strength structural applications. Cryorolling is one of the promising methods of enhancing the mechanical properties of sheet metals. In the present work, Cryorolling of UNS S31000 stainless steel resulted in five-fold enhancement in yield strength with a significant loss in ductility. However, flash annealing at 800 °C for 120 s could restore its ductility up to 50% of its original ductility. The enhancement in strength is attributed to the formation of deformation nano-twins during flash annealing along with a bimodal grain structure.

Nucleation and growth of TiAl3 intermetallic phase in diffusion bonded Ti/Al Metal Intermetallic Laminate.

A novel nucleation and growth phenomenon for TiAl3 intermetallic phase in Ti/Al diffusion couple is proposed based on diffusion kinetics. The interdiffusion and intrinsic diffusion co-efficients are calculated to make evident of dominant diffusion of Al towards Ti in Ti/Al diffusion couple obtained by solid state diffusion bonding. It was surprising to observe that the diffusion rate of Al was around 20 times higher than Ti with the formation of Kirkendall pores near the Al/TiAl3 interface. With such dominant diffusion of Al towards Ti, the nucleation and growth of TiAl3 intermetallic phase in Ti/Al couple happens mainly at the Ti/TiAl3 interface rather than Al/TiAl3 interface which is evident by the presence of very fine nearly nano-sized TiAl3 nuclei/grains near the Ti/TiAl3 interface. Even though the intermetallic phase is expected to nucleate at Al/TiAl3 interface, the relatively larger TiAl3 grains near that interface depicts grain growth with minimal nucleation. The theoretical calculations on diffusion parameters are in accordance with experimental observations of TiAl3 intermetallic growth phenomenon in Ti/Al system.

Angiographic predictors of success in antegrade approach of Chronic Total Occlusion interventions in a South Indian population in the contemporary era.

Chronic Total Occlusion (CTO) intervention is a challenging area in interventional cardiology. Presently about 70% of CTO interventions are successful. MATERIALS AND METHODS: This was a single center prospective study of a cohort of all patients undergoing percutaneous coronary intervention (PCI) as elective or adhoc procedure for CTO from August 2014 to June 2015. Only antegrade CTO interventions were included. In all patients the following data were recorded. RESULTS: A total of 210 (8.9% of total PCI (2353) during the study period) CTO patients were followed up. The mean age was 56.54±8.9. In the study sixty nine patients (32.9%) presented with chronic stable angina and rest of the patients had history of acute coronary syndrome of which 22.9% (n=48) had unstable angina (UA) or non ST elevation myocardial infarction (NSTEMI) and 44.2% (n=93) had ST Elevation Myocardial Infarction (STEMI). In those with history of ACS, 64.78% (n=92) had ACS during the previous year and remaining 35.22% (n=49) had ACS prior to that. Single vessel CTO was seen in 89.5% (n=188) and two vessel CTO in 10.5% (n=22). LAD was involved in 36.7% (n=77), RCA in 48.1% (n=101), and LCX in 15.2% (n=32). Procedural success in the first attempt was 68.1% (n=143), which increased to 71.42% (n=150) after the second attempt. CTO interventions were more frequently successful when the calcium was absent or minimal (p-0.05), CTO length was <10mm (p<0.01) and good distal reformation (p<0.01).

Hybrid Implant: A Novel Implant System.

INTRODUCTION: Replacement of missing tooth has evolved from removable dentures to fixed dentures and recently to dental implants. The need of sufficient bone around the endosseous implant is critical for the success of the implant. The present study was aimed to evaluate the efficacy of a novel implant (HYBRID IMPLANT-submitted for patency) for replacement of the missing teeth. MATERIALS AND METHODS: 1. Research design A prospective research design with a follow up after 1st week ,2nd week ,3rd week,1st month ,3rd month,6th month and 1st year postoperatively. 2. Sampling method Population: All patients who reported for replacement of missing teeth. Inclusion criteria 1. All patients above the age group of 16years 2. Patients who need replacement of single or multiple teeth in the anterior or posterior region of the maxilla and mandible. Exclusion criteria 1. Medically compromised patients. 2. Patients having craniofacial syndromes. 3. Sample size 5 patients were selected taking into consideration the inclusion and exclusion Criteria. Results PAIN All the patients were non symptomatic during the 1st month to 1st year postoperative periods. MOBILITY: We experienced mobility during the 1st and 2nd postoperative periods where the implants were inserted in the mandibular molar region. BONE LOSS: Radiographic assessment showed no bone loss during the postoperative periods. CONCLUSION: The novel implant (hybrid implant) showed good stability and minimum patient discomfort during one year postoperative period evaluation. The implant system leads to new prospect in the field of prosthetic rehabilitation.

Eosinophilic granuloma of mandibular condyle: resection and complete regeneration.

Eosinophilic granuloma is a rare disease of abnormal proliferation of Langerhan cells affecting the jaws of young individuals. We report a case of complete regeneration of condyle in a 13 year old boy with eosinophilic granuloma condyle, who had undergone condylectomy.

Management of Cleft Maxillary Hypoplasia with Anterior Maxillary Distraction: Our Experience.

Maxillary hypoplasia is a common developmental problem in cleft lip and palate deformities. Since 1970s these deformities have traditionally been corrected by means of orthognathic surgery. Management of skeletal deformities in the maxillofacial region has been an important challenge for maxillofacial surgeons and orthodontists. Distraction osteogenesis is a surgical technique that uses body's own repairing mechanisms for optimal reconstruction of the tissues. We present four cases of anterior maxillary distraction osteogenesis with tooth borne distraction device-Hyrax, which were analyzed retrospectively for the efficacy of the tooth borne device-Hyrax and skeletal stability of distracted anterior maxillary segment.

Polymorphous low-grade adenocarcinoma--management and reconstruction with temporalis myofacial flap.

Polymorphous low-grade adenocarcinoma is a rare, malignant salivary gland tumor, which is found almost exclusively in minor salivary glands. It is more frequent in the third-seventh decade of life, with a clear female predilection in a 2:1 ratio. It is usually located in the hard or soft palate, although it may be found in the rest of the oral cavity too. It is rare in major salivary glands. In general it has good prognosis, with recurrence rates in the range of 17-24%. Although rare, metastasis to regional lymph nodes has been reported. We report a case of 38 year old female patient who reported with recurrent low grade polymorphous adenocarcinoma in the hard palate, who has been treated with wide excision of the lesion, with reconstruction of the defect using temporalis myofacial flap.

Thrombectomy with rescue percutaneous thrombectomy catheter: our initial experience.

Plaque rupture and subsequent thrombus formation inside the coronary arteries has been known for years. Mechanical devices have been used for the extraction or dissolution of thrombus inside the coronary arteries. This report illustrates the use of the Rescue Percutaneous Thrombectomy Catheter in a right coronary artery loaded with thrombus. Following thrombectomy, the stenosis in the artery was well delineated. Successful balloon angioplasty was performed, which resulted in TIMI 3 flow and no distal embolization. Rescue Percutaneous Thrombectomy Catheter has been successfully used in the setting of acute myocardial infarction. The present case illustrates that the Rescue Percutaneous Thrombectomy Catheter can be used for removing thrombus even one month after acute myocardial infarction.

A system to measure a pilot's temporal pulse pressure during acceleration.

This paper describes the design and capabilities of a noninvasive system to record the superficial temporal artery (STA) pulse pressure during diving scenarios in pilots. The Piezoelectric Pulse Pressure Monitoring System (P3) records the "best" waveform from an array of piezoelectric benders in contact with the skin above the STA during +1 Gz acceleration and then continuously monitors it during +Gz acceleration for determination of G-LOC conditions. Results indicate that P3 may be used in a cockpit environment and may be the controller in an aircraft autorecovery system.

Simulations of arterial pressure pulses using a transmission line model.

Transmission of pressure pulses from the aorta to the central retinal artery is studied under normal and stenotic conditions. A convenient model for the study is obtained by replacing the arteries with a network of distributed electrical transmission lines. By using boundary conditions and a voltage-pressure analogy, the transmitted pulse is obtained. Stenosis of varying degrees were simulated at different locations and the characteristics of the transmitted pulse was studied by examining its peak value, the dicrotic notch and the systolic slope. The dependence of the characteristics of the transmitted pulse on the physical parameters were also studied.