Assessment of Deciduous Dentition in 6-10 Year Old School Children
نویسندگان
چکیده
Deciduous teeth (dentes lactales, dentes decidua, dentes caduci) differ from permanent teeth by morphological and histological characteristics. Of the morphological characteristics, the most pronounced differences are in number, shape, size and color of teeth. A special fea ture is the existence of enameldentin ridge located on the vestibular surface of molars, which protects gingiva from food impaction. Deciduous teeth are smaller than permanent, enamel rarely exceed an average thickness of 1 mm. Due to poorer mineralization, tooth color is milkywhite while cutting edge often shows attrition [1]. Of histological features, the most pronounced changes are in teeth mineralization. The part of enamel syn thesized before birth shows better mineralization. The number of tubules is smaller but wider and irregular in shape. Cement is thin and poorly mineralized while pulp chamber is voluminous with prominent horns. Sharpey’s fibers are irregular and their number is lower than in permanent teeth [1]. The first deciduous tooth erupts usually at age 68 months, while complete deciduous dentition is formed around age 3. With the eruption of teeth, there is a change in oral microflora, and microorganisms that primarily live on teeth appear (Streptococcus sanguis, Streptococcus mutans and Actinomyces viscosus) [2]. Today, tooth decay is the most prevalent chronic disease in children [3]. Due to the frequency and distribution of tooth decay it has become a public health problem [4]. New findings in the field of biochemistry, microbiology, scanning electron microscopy and other sciences, have led to the current view that caries is an infectious disease, directly depend ent on diet [5]. Most of studies and national surveys carried out in dif ferent geographical areas and different countries about the prevalence of caries have been focused on children age 6, 12 and 15. However, data about the status of teeth in Assessment of Deciduous Dentition in 6-10 Year Old School Children
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