True or FalseA nonabrasive dentifrice is indicated to prevent the possibility of abrasion when pontic or crown facings are made of acrylic, when the gold of the partial denture is highly polished and could be scratched, and when areas of root exposure are on abutment teeth. A fluoride-containing dentifrice is important for protection of remaining tooth surfaces, particularly exposed cementum; acidulated fluoride preparations are contraindicated for porcelain and composite restorations.

Both statements are true.

Explanation:

A  nonabrasive dentifrice is indicated in order to to prevent scratching of gold prostheses and acrylic. It is indicated to prevent the possibility of abrasion when pontic or crown facings are made of acrylic, when the gold of the partial denture is highly polished and could be scratched, and when areas of root exposure are on abutment teeth.

For caries protection for remaining tooth structures, fluoride dentifrice is recommended as it  is important for protection of remaining tooth surfaces, particularly exposed cementum.

Due to acidity Acidulated Fluoride Preparation is contraindicated in an oral cavity with porcelain and composite restorations.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.