Question 129 (part 2) · LDEK · Etiology and pathogenesis of caries

Choose true statements describing translucent layer of early carious lesion in enamel:

1. AA. contents of pores in this layer are 2 to 4 %, pores are of various size; smaller pores are not penetrated by quinoline, thus remain empty; in this layer mostly remineralisation processes take place.
2. BB. it does not occur in every carious spot; it is adjacent to healthy tooth, visible only during immersing the tooth in quinoline, it is without structure and more porous than healthy enamel; loss of mineral part in this layer is 1% and concerns only magnesium and carbonates.
3. CC. it is the widest layer of early carious lesion; loss of mineral substance from 5% on circumference to 25 % in the centre of the lesion, its coloration results in the fact that water particles penetrating the pores are of other refraction index than enamel.
4. DD. its width is 20 to 50 μm; volume of pores is 1%; it arises as a result of alternate processes of demineralization and remineralization; it is visible in polarized light during immersing the preparation in water.
5. EE. diffusive canals for circulation and exchange of ions are present in this layer; mineral loss and pores volume is 1 %; small pores may be formed through demineralization of places up until now not infected or constitute places of big pores repair.