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25 Cards in this Set
- Front
- Back
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compare actual decay to that seen on a radiograph
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usually about 50% more than what is seen on the radiograph
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what radiographs do you use to diagnose interproximal caries
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bitewings
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describe incipient caries
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less than 50% through the enamel - we don't restore these lesions
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describe moderate caries
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more than half way through the enamel but not into the dentin - generally not restored
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describe advanced caries
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spread through the DEJ. usually conical through the DEJ, but then spreads once it hits the dentin - less than half the distance to the pulp
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describe severe caries
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more than half way through the dentin
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describe moderate occlusal caries
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a thin band of decay along the DEJ
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describe severe occlusal caries
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large radiolucent hole
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what is the best way to identify buccal or lingual caries
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by examination - radiographs are ineffective for buccal/lingual caries because of all the enamel and dentin on top of it
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what must happen in order for there to be root caries
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bone loss
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recurrent caries
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caries that occur under margins of restorations
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name a few things that may be confused as caries
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- composite
- attrition - abrasion - cervical burnout |
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how can you distinguish composites from caries
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they will have a normal geometric outline, and may have a radioopague cement
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what is the usual cause of abrasion
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tooth brushing
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where is abrasion usually found
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at the gum line
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what causes cervical burnout
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since the center of the teeth are thicker than the interproximal areas, the interproximal areas appear more radiolucent than the center
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when is cervical burnout a diagnosis
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never
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how does decay appear on radiographs
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as radiolucent zones, since not as many photons are absorbed as in normal tooth structure
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how do remineralized lesions appear
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as demineralized scars - because remineralization only occurs on the outermost surface
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PA's are more useful for what purpose
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detecting changes in periapical bone
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what size film is used for bitewings? starting at what age?
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size 2 - from age 7 upwards
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describe the typical shape of interproximal lesions
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usually triangular with the broad base on the interproximal surface and apex towards the DEJ; after it breaks through the DEJ, it forms another triangle with a much broader base at the DEJ and the apex pointing towards the pulp chamber
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where is the most common site for interproximal decay
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the area between the contact point and the free gingival margin
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how may you distinguish caries from cervical burnout
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remember that a lesion does not begin below the gingival margin
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at what point are proximal lesions evident on radiographs
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at about 30-40% demineralization - this is why most lesions are larger than they appear on radiograph
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