PURPOSE: Finite element study on the effect of abutment length and material on implant bone interface against dynamic loading. MATERIALS AND METHODS: Two dimensional finite element models of cylinderical implant, abutments and bone made by titanium or polyoxymethylene were simulated with the aid of Marc/Mentat software. Each model represented bone, implant and titanium or polyoxymethylene abutment. Model 1: Implant with 3 mm titanium abutment, Model 2: Implant with 2 mm polyoxymethylene resilient material abutment, Model 3: Implant with 3 mm polyoxymethylene resilient material abutment and Model 4: Implant with 4 mm polyoxymethylene resilient material abutment. A vertical load of 11 N was applied with a frequency of 2 cycles/sec. The stress distribution pattern and displacement at the junction of cortical bone and implant was recorded. RESULTS: When Model 2, 3 and 4 are compared with Model 1, they showed narrowing of stress distribution pattern in the cortical bone as the height of the polyoxymethylene resilient material abutment increases. Model 2, 3 and 4 showed slightly less but similar displacement when compared to Model 1. CONCLUSION: Within the limitation of this study, we conclude that introduction of different height resilient material abutment with different heights i.e. 2 mm, 3 mm and 4 mm polyoxymethylene, does not bring about significant change in stress distribution pattern and displacement as compared to 3 mm Ti abutment. Clinically, with the application of resilient material abutment there is no significant change in stress distribution around implant-bone interface.
Dental Implants ; Displacement (Psychology) ; Finite Element Analysis ; Titanium

In this report, we present a case of 35-year-old lady who had presented with atypical chest pain and exertional breathlessness for past six months. Transthoracic and transesophageal echocardiograms showed a well-circumscribed, echo-dense mass in the right atrium, attached to the interatrial septum at the level of atrioventricular junction and in the vicinity of coronary sinus ostium. She underwent successful resection of the cardiac mass. Histopathology revealed paraganglioma, which was reconfirmed by immunohistochemistry study. This represents an extremely rare presentation as primary cardiac tumors are 20-times less common than metastatic tumors and paraganglioma is one of the rarest primary cardiac tumors, accounting for < 1% of all cases.
Adult ; Chest Pain ; Coronary Sinus ; Dyspnea ; Heart Atria ; Heart Neoplasms* ; Humans ; Immunohistochemistry ; Myxoma* ; Paraganglioma* ; Pheochromocytoma

Thyroid tumors display diverse spectrum of histopathological groups with geographic variation in its prevalence. Influence of iodine deficiency (a major causative factor) in its etiology, prevalence, or aggressiveness is debatable which reflects the existence of various genetic events in pathogenesis. The present study was undertaken to study the role of Microsatellite instability (MSI) or LOH (loss of heterozygosity), an indicator of defective mismatch repair system as a genetic change and to explore it as a prognostic marker in thyroid tumors. Tumor tissues from total thyroidectomy surgical specimens and blood (matched control) of 36 patients from iodine deficient areas (10 benign; 26 malignant) were obtained after their consent. Urinary iodine analysis was done by alkali ash method for which 10 ml of urine was collected from 18 patients before surgery. Genomic DNA, isolated from tumor tissue and blood was amplified by polymerase chain reaction (PCR) using mono and dinucleotide markers - BAT-26, BAT-40, TGF(RII, IGFIIR, hMSH3, BAX, D2S123, D9S283, D9S851 and D18S58. PCR products were analysed on 8% denaturing polyacrylamide gel followed by autoradiography. Of total, 66.6% of tumors [70% (7/10) benign and 65.4% malignant cases (17/26)] showed MSI/LOH. Strong association of MSI/LOH with low iodine (P=0.01) and with AMES risk groups i.e. age (P=0.02), tumor size (P=0.04) and metastases (P=0.002) in thyroid tumors was observed. This may help in predicting the biological behaviour and strengthening the hypothesis that iodine deficiency has influence on MSI in thyroid tumors. Our results further substantiate the risk group classification and help in deciding the treatment modality in particular patient.
Adult ; Aged ; DNA, Neoplasm/*genetics ; Female ; Genomic Instability/*genetics ; Humans ; Iodine/*deficiency/urine ; Loss of Heterozygosity/genetics ; Male ; Microsatellite Repeats/*genetics ; Middle Aged ; Predictive Value of Tests ; Prevalence ; Research Support, Non-U.S. Gov't ; Risk Factors ; Thyroid Neoplasms/epidemiology/etiology/*genetics/pathology/therapy/urine ; Thyroidectomy ; Tumor Markers, Biological/*genetics

Objective: Short stature can be caused by a great variety of congenital and acquired conditions, some of which present with additional symptoms and signs. Overall, the number of patients seeking medical attention for short stature may be considered as the tip of the iceberg. The objective of this study was to determine the pattern and etiological factors of short stature in children. Methodology: A cross-sectional study was carried out in the Department of Endocrinology at a tertiary care health center in north India from August 2012 to June 2015. Four hundred and fifty one children (280 boys and 171 girls), ranging from 4 to 18 years presenting with short stature were studied. Anthropometric measurements were plotted on Indian standard growth charts. Results: In this study, the male to female ratio was found to be 1.6:1, with mean chronological age of 11.6+3.2 years, and mean bone age of 7.8+2.8 years. The common etiologic factors in the order of frequency were constitutional delay in growth and puberty (41.2%), familial short stature (15.9%), type 1 diabetes mellitus (9.9%), and hypothyroidism (8.6%) while growth hormone deficiency (2.4%) was a relatively uncommon cause. The most common pathological cause for proportionate short stature was type 1 diabetes and for disproportionate short stature was hypothyroidism. Hypothyroidism caused the maximum retardation of bone age while the least bone age retardation was noticed in familial short stature. Conclusion Physiological/normal variants outnumbered the pathological causes of short stature. Endocrinological causes were found in almost one fourth of children with short stature; however, growth hormone deficiency was found in only 2.4% of the children.
Diabetes Mellitus, Type 1 ; Growth Hormone