preventive dentistry 2
Terms
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- Types of soft dental deposits
-
acquired pellicle
microbial plaque
materia alba
food debris - acquired pellicle
- thin protein film. derived supragingivally from saliva and subgingivally from gingival sulcus fluid. It is ACELLULAR and reforms in minutes after removal
- Characteristics of pellicle
- protective barrier against acids, lubrication, nidus for bacteria, mode for calculus attatchment
- biofilm
- dense, organized, non calcified. Adhere firmly to acquired pellicle. It reforms daily.
- Only way biofilm can be removed
- mechanically
- The basic steps of plaque formation
-
1. pellicle formation
2. bacterial colonization
3. plaque maturation - composition of plaque
-
80% water and 20% organic and inorganic solids
of the solis 70% is MO and 30% is intercellular matrix - What composes intercellular matrix of plaque
- Ca and P and flouride
- what composes organic elements of plaque
- Carbs made from sucrose, proteins, and lipids
- pathogenic effects of bacterial plaque (biofilm)
-
1. cariogenic
2. periodontal disease
3. calculoenic - caries formation
-
cariogenic food
plaque
acid formation
decalcification
caries - ways to detect bacterial plaque
-
1. direct vision
2. explorer
3. disclosing agent
4. gingival color change - material alba
- visible soft mix of salivary proteins, bacterial and epithelial cells. Loosely attached to plaque, or tooth surface. It can coome off with forceful water spray
- Where is food debris retained?
-
occlusion
anantomy of tooth
appliances
open contacts
restorations - hard dental deposits
- calculas
- what alwyas covers calculas
- plaque
- formation of calculus
-
1. pellicle formation
2. plaque formation and matureatin
3 mineralization - mechanism of mineralization
- same for supra and subgingival but they mineralize seperately.
- rate of calculus formation
-
12 days
but can begin within 24-48 hours!!!!! - What seperates calculus layers?
- seperated by a pellicle and the outer layer is covered by plaque
- source of supragingival calculus
- saliva
- color of supragingival calculus
-
white, creamy yellow
very bulky, moderatley hard - radiograph of supragingival calculus
- very dense visbile causes a calculus bridge
- source of subgingival calculus
- gingival sulcular flid and inflammatiory exudate
- color of subgingival calculus
- light or dark brown, greeen, or black. stain is due to blood pigments
- what is hard subgingival or supragingivla calculus?
- subgingival.
- Radiograph of subgingival calculus
- can see it interproximally
- composition of calculus
-
75-85% inorganic
Ca, P, carbonate, Na, Mg, K, crystals which is 2/3 of the inorgainic material - organic portion of calculas
- microbes, wbcs, epithelial cells, and salivary mucins
- does calculus cause pocket?
- NO calculus is the result of pockets. plaque causes pocket
- calculus detection
-
visulual with air
gingival color change
tactile
disclosant
transillumination
radiograph - purpose of plaque index
-
1. help recoginize oral problem
2. revel degree of oral hygiene effectiveness
3. motivate pt to eliminate disease
4. evaluate success over a period of time by comparison
5. make pt own his/her disease