Dental caries prevalence and its association with fluoride level in drinking water in Sana'a, Yemen.

Objectives: Dental caries is the most prevalent chronic condition affecting schoolchildren worldwide. This study is aimed to assess the prevalence of dental caries among schoolchildren in urban and rural districts of Sana'a governorate, Yemen, and to investigate the correlation between caries experience and level of fluoride in drinking water, age, gender, and residence.

Materials And Methods: This school-based survey involved 17,599 schoolchildren (aged 6-12 years), of whom 9623 were boys and 7976 were girls.

Khat a drug of abuse: roles of free radicals and antioxidants.

Many articles have reviewed the health impact of Khat consumption; however the role of free radicals in the pathogenesis associated with short- and long-term consumption of Khat is absent in the literature. As free radicals and antioxidants converge across various mechanisms in normal physiological function and in disease, this review attempts to uncover the role of endogenous free radicals and the mechanism of cellular injury associated with Khat consumption.

Free radicals are present in human serum of Catha edulis Forsk (Khat) abusers.

Objective: Khat (Catha edulis Forsk) is a naturally occurring drug with an amphetamine-like structure and action. It has been postulated that amphetamine induces free radical formation. On this basis, we have hypothesized that Khat may promote synthesis of reactive oxygen and nitrogen species in the same way that amphetamine promotes free radical production.

Pneumatic dilation of cardiac achalasia using low compliance balloon: University-Hospital experience.

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