By Gu Anlin & Wang Zongli
ISBN-10: 7511600425
ISBN-13: 9787511600424
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Extra info for Atlas of Rangeland Plants in Northern China
Sample text
Hypomaturation amelogenesis imperfecta The enamel is normal in form on eruption but opaque, white to brownish-yellow. 15). However, they are soft and vulnerable to attrition, though not as severely as the hypocalcified type. There are several variants of hypomaturation defects such as a more severe, autosomal dominant (type 4) of hypomaturation combined with hypoplasia. Hypocalcified amelogenesis imperfecta 22 Enamel matrix is formed in normal quantity but poorly calcified. When newly erupted, the enamel is normal in thickness and form, but weak and opaque or chalky in appearance.
In view of an incubation period of many years, this suggestion is consistent with the onset of the disease in adolescence. However, this theory is as yet unproven. Eruption of deciduous teeth starts at about 6 months, usually with the appearance of the lower incisors, and is complete by about 2 years. Mass failure of eruption is very rare. More often eruption of a single tooth is prevented by local obstruction. In the permanent dentition, delay in eruption of a tooth or, more frequently, too early loss of a deciduous predecessor tends to cause irregularities because movement of adjacent teeth closes the available space.
4) enables large concentrations of them to adhere to the teeth and, in stagnation areas, prevents effective buffering of bacterial acids by saliva. 3. The cariogenicity of S. 4. 2 • It forms large amounts of extracellular, sticky and insoluble glucan plaque matrix • It adheres to pellicle and contributes to plaque formation Fig. 5 This scanning electronmicrograph of plaque shows the large number of filamentous organisms and, in addition, many cocci clustered amongst them. ) BACTERIAL PLAQUE Fig.
Atlas of Rangeland Plants in Northern China by Gu Anlin & Wang Zongli
by Christopher
4.4
