Evaluation of compressive strength and sorption/solubility of four luting cements

Statement of Problem: Compressive strength [CS] and sorption/solubility of the luting cements are two associated factors. Searching a correlation between sorption/solubility and compressive strength of various luting cements is required

Objectives: To measure the water sorption/solubility, and compressive strength of three resin-based and one conventional glass ionomer [CGI] luting cement after 1 and 24 h of immersion in distilled water and to determine if there is any correlation between those properties found

Materials and Methods: Four luting cements were investigated. For each material, 10 disc shaped specimens were prepared for measuring the sorption/solubility. The specimens were cured according to the manufacturer's instructions, and the sorption/solubility were measured in accordance with the ISO 4049's. For testing the compression strength, for each material 16 cylindrical specimens were prepared by insertion of cements into a stainless steel split mould. The specimens were cured, divided into groups of 8, and then stored in distilled water at [37 +/- 1][degree]C for 1 and 24 h. The test was performed using the universal testing machine, the maximum load was recorded and CS was calculated. The data were analysed using SPSS software version 18. One-way ANOVA, post-hoc Tukey's test and Pearson's correlation coefficient were performed

Results: G-CEM had the highest mean CS [153.60 +/- 25.15] and CGI luting had the lowest CS [21.36 +/- 5.37] [p <0.001]. After 24 h, mean CS values showed an increase for almost all materials except for RelyXTM U200 which showed a slight reduction. However, no statistically significant difference was founded [all p > 0.05]. The lowest mean sorption/solubility value was for RelyXTM U200 and Panavia F, and the highest for CGI luting [all p < 0.001]

Conclusions: The compressive strength of all cements did not necessarily increase after 24 h and varied depending on the materials. There was a strong reverse correlation between sorption and CS values after both 1 and 24 h immersion. It may be practical for clinician to use those cements with the less sorption / solubility and more stable compression strength over time

Direct esthetic rehabilitation of teeth with severe fluorosis: a case report

This article describes an esthetic rehabilitation of a case of severe fluorosis associated with tooth mobility and gingival recession. Direct composite technique was applied to improve the color, shape and alignment of the teeth using direct composite veneering and replacement of the missing tooth by fiber-reinforced composite bridge. One year follow up have displayed acceptable outcomes and esthetic appearance

Cancer, recently known as the third mortality factor, is one of the health problems in Iran

This study was intended to record the number of endocrine cancer in four provinces of Iran. Patients in each province were classified according to their age, gender, sex, and tumor characteristics [site, morphology and behavior]. The obtained data were coded according to ICD-O. High-risk age was calculated for each province and the results presented as incidence rates by sex, age, age-specific rates and ASR per 100,000 person - years using standard statistical methods to the world population. Out of 319 cases of primary endocrine cancers found and recorded, 313 cases were thyroid carcinoma and 6 cases were adrensal cancers. In thyroid carcinoma group, the share of Papillary, follicular, medullary and anaplastic carcinomas accounted for 82.7%, 8.6%, 7.0% and 1.6% respectively. Also, the ASR of thyroid carcinoma for total, male and female cases were 1.289, 0.627 and 1.59 respectively. The highest incidence rate of the thyroid carcinoma was found in Kerman with the ASR of 1.643 for both genders and the lowest rate in Golestan with the ASR of 0.735. Mean age of patients was 43.9 years [SD=15.90] and their age ranged from 3 to 8 years. This figure for males was 45.21 [ +/- 17.13] and for females 43.49 [ +/- 15.51] [P=0.41]. Also, the female - male ratio was 3.1 to 1. In adrenal cases [n=6], 4 cases [66.7%] had neuroblastoma and 2 cases were pheochromocytoma [33.3%]. The mean diagnosis age was 16.17 [ +/- 7.05] years for the whole population of cases; 13.00 [ +/- 3.46] years for males and 19.33 [ +/- 9.07] for females [P=0.32]. Iran was considered as an endemic iodine-deficient region until fairly recently. However, iodinization of salt started 12 years ago and since then, this increase has caused an increase in the incidence of papillary cancer, compared to other thyroid carcinomas; its frequency and distribution closely correspond to the observed profile in areas with high iodine consumption

[Clinical and microscopic findings In 71 cases of craniopharyngioma referred to Tehran Shariati Hospital]

Craniopharyngiomas make up about 1-3 percent of primary tumors of the CNS. This tumor can develop at any time from birth to old age, but more than 50% of patients are younger than 20 years. Most of them are suprasellar, but nearly 25% have an intrasellar component. Most of the clinical manifestation of tumor are related to their compressive effects, and include headache, visual disturbance, hydrocephalus and endocrine abnormalities. Two distinct variants of craniopharyngioma are recognized, the classic adamantinomatous type and a recently described papillary form. In this study we describe clinicopathologic findings of 71 patients diagnosed with craniophayngioma. The majority of patients were male, patients age ranged between 4 to 51 years and headache was the commonest presenting symptom. Microscopically most of them were adamantinomatous type and only 5 cases were papillary type. The most common post operative complication was recurrence of disease, and all of them were adamantinomatous type