week four Flashcards
(22 cards)
what percentage of 5-9 year olds have cavities?
50%
what is the formula for hydroxyapatite?
ca10(po4)6(oh)2
what bacteria produce acid?
streptococcus mutans
what causes the progression of the lesion?
lactobacilli
what factors affect the rate at which acid is produced in plaque?
- the microbial composition of the dental plaque
- the density of plaque
- the speed at which bacteria are able to metabolize the carbohydrate
what does demineralization come from?
acid from bacteria and bad home care
what can help remineralize the teeth
fluoride, healthy snacks, good home care
what does saliva help with?
buffer ph, cleanses the oral cavity of food and debris helps with remineralization
what is the resting plaque ph
6 to 7
incipient caries
the initial stage of tooth decay that has not penetrated the outer surface of the tooth
rampant caries
rapidly progressive decay process
arrested caries
characterized by light or brown color and firm and glass like appearance
recurrent caries
new decay alone existing restorations
what are the four zones of incipient lesions?
surface zone, body of the lesion, dark zone, translucent zone (deepest zone)
compound cavity
involves two tooth surfaces
complex cavity
involves more than two surfaces
class one
- pits and fissures of occlusal surfaces of molars and pre
- buccal and lingual pits of molars
- lingual pits of maxillary incisors
class two
proximal surfaces of premolars and molars
class three
proximal surfaces of incisors and canines
class four
proximal surfaces of incisors and canines INCLUDING incisal angle
class five
gingival third of facial or lingual surface of any tooth
class six
incisal edge of anterior tooth and cusps tips of posterior teeth
