Stuff... Flashcards
High speed handpiece RPM
> 200,000
Low speed handpick RPM
<12,000
Water fluoridation ppm
.7-1.2 ppm
Most cost effective
Bacteria that causes smooth surface caries (not root caries)
Streptococcus mutano
Lactobacillus
Streptococcus sobrinus
Root caries bacteria
Actinomyces
Bacteria that dominates dentin caries
Lactobacillus
Protective components of saliva
- Glycoproteins
- Buffering
- Antimicrobial - lysozyme, lactoferrin, lactoperoxidase, IgA
- Remineralization - Ca, P, K, F
If the tooth is cavitated the caries must be where?
into the DENTIN
** if caries is in the dentin it does not mean it is cavitated**
Hand instrument labeling
BW - CEA - BL - BA
BW - blade width in tenths of mm
CEA - cutting edge angle. % of 360
BL - blade length in mms
BA - blade angle (always 50 or less)
10 - 8.5 - 8 - 14
1 mm BW
8.5% Cutting edge angle
8 mm long
14 degrees
Postive rank angle bur
HARD material
Cutting action
* bur dulls faster*
Cutting edge is pointed in the SAME direction as rotation.
Negative rank angle bur
SOFT material
Scrape action
*Endo files - smooth the surface)
Rank Angle
Determined by angle between leading edge and radius.
What size of ditching can be present on a restoration before it needs to be replaced?
(AMALGAM)
Can have .5 mm deep
Is self sealing
What are early colonizers for supra gingival plaque? (2)
Strep Sanguines
Actinomyces viscous
