Dental plaque 2

Dental plaque is mostly composed of...

Dental plaque's chemical composition is mostly...

Bacteria store glucose intracellularly as...

Which enzyme breaks down sucrose into glucose and fructose and produces Glucan/Dextran?

Which enzyme breaks down sucrose into glucose and fructose and produces Fructan/Levan?

What bonds are found in fructan?

What bonds are found in glucan?

The ability of bacteria to form plaque is directly related to their ability to synthesise extracellular polymers

What soluble glucan is known as...

Resting plaque pH is around...

It takes at most 20 minutes for the pH of the mouth to return to normal after rinsing with a sugar solution.

The majority of acid produced by plaque bacteria is..

The critical pH of the mouth is [blank_start]5.7[blank_end]. Below this value enamel begins to [blank_start]dissolve[blank_end].

Sucrose intake leads to early plaque containing high numbers of bacteria capable of synthesising glucans

Plaque is less bulky with sucrose rich diets

Which option is the least cariogenic?

What acid(s) have the highest concentration in plaque?

Plaque pH drops dramatically after sugar consumption. This is thought to be because of [blank_start]sugar[blank_end] diffusing into the plaque and [blank_start]hydrogen[blank_end] ions diffusing out of it.

What are the main buffering systems in saliva?

In periods of [blank_start]carbohydrate[blank_end] starvation, plaque metabolises urea into [blank_start]ammonia[blank_end]. It does this by breaking urea down into amino acids then into [blank_start]ammonia[blank_end]. This causes an [blank_start]increase[blank_end] in pH

Which components are important in host tissue destruction?

Which components are important in host tissue inflammation?

For calculus to form, seeding agents must be present. These are usually dying bacteria, lipids and g[blank_start]lycoproteins[blank_end]. [blank_start]Calcium phosphate[blank_end] crystals form and these are derived from saliva (become incorporated in plaque). These crystals merge together on the seeding agents to form a large mass of calculus.

Bacteria accelerate plaque mineralisation by...

Compared to supragingival calculus, subgingival calculus has...

Which has higher mineral content?

The surface of calculus is r[blank_start]ough[blank_end] and p[blank_start]orous[blank_end].

The predominant flora of outer layer of calculus consists of...

Bacteria near the enamel surface of calculus tend to have a reduced cytoplasm to cell wall [blank_start]ratio[blank_end]. This is because they are metabolically [blank_start]inactive[blank_end].

The [blank_start]palisade[blank_end] effect of bacteria in calculus is due to filaments orientating themselves at [blank_start]right[blank_end] angles to the enamel surface