Final Exam Flashcards
When to place indirect restorations (inlays/onlays/veneers/crowns/etc.):
- when margin exceeds 2/3 the distance between the central groove and cusp tips
- when the margin ends 1/2 distance between the central groove and cusp tips
When to use an only instead of an inlay:
- when buccal-lingual width of cavity prep is:
- 1/2 way between the central groove and cusp tips: consider onlaying the cusp
- 2/3 way between central groove and cusp tips: should onlay the cusp
Inlay dimension:
1) isthmus must be atleast 2.0 mm wide and diverge
2) facial, lingual, and gingival margins must have clearance of atleast 0.5mm
Principles of gold onlays:
A) ___ bevel of ___ mm on cusps of ___ occlusion
B) ____ mm on cusp of ____ occlusion
C) Gold onlay- ____ reduction on functional cusp and ____ reduction on non-functional cusp
A) reverse bevel; 1-2mm; supporting
B) 0.5mm; non-supporting
C) 1.5 mm; 1.0 mm
Wears the opposing teeth the most and has the highest resistance to wear:
porcelain
List the following materials in order of most to least wear on opposing dentition:
- direct resin composites
- porcelain
- lab processed composites
- porcelain
- lab processed composites
- direct resin composites
Describe the reduction needed for a porcelain onlay:
functional cusp: 2.0 mm
non-functional cusp: 1.5 mm
Describe the reduction needed for a gold onlay:
functional cusp: 1.5 mm
non-functional cusp: 1.0 mm
T/F: there should be NO bevel on porcelain margins
True
When considering a provisional, use a ____ cement.
eugenol-free
____ will interfere with bonding with a provisional
eugenol
If you must use eugenol when doing a provisional, you should:
pumice the tooth well to remove eugenol
____ prep is needed for porcelain veneers
minimal
When preparing for porcelain veneers, try to keep the prep within ____ for ____
enamel for optimal bond strength
What is the minimum depth that pins go into the dentin?
0.5 mm
Why don’t you want a pin on the mid mesial of #5?
concavity of the root
Why do you use increments when using composite?
to minimize polymerization stress
Dentist restores a lesion with resin infiltration by:
etch only
With two adjacent preps…
you should prep the largest first, but restore the smallest first
What bacteria is found in advanced dental caries?
Lactobacilli
0.5 mm dentin between the pulp and restoration, what should be used?
CaOH liner then RMGI
What does the oxygen inhibited layer do?
allows for wetablilty and allows adding more composite
1 mm above crestal bone you want to use:
amalgam
What is the minimum depth that pins must go into the dentin?
2 mm
Why wouldn’t you use a pin on the mid mesial of #5?
concavity of the root
Why do you place composite in increments?
to minimize polymerization stress
Dentist restores a lesion with resin infiltration by:
etch only
If you have two adjacent preps/restorations, you should:
prep largest first but restore smallest first
What type of bacteria is found in advanced dental caries?
lactobacilli
If you only have 0.5 mm of dentin between the pulp and restoration you should use:
CaOH liner (dycal or life) and then RMGI (vitrebond)
Increases wetbablity and allows adding more composite:
oxygen inhibited layer
If you are 1mm above crestal bone you want to use:
amalgam
The least desirable finish for porcelain veneer is
(maybe lingual something)
Pins increase which of the following?
retention
Emax is also known as:
lithium discilcate
T/F: MO #3 gold onlay always break mesial proximal contact:
???
What does adding more filler do?
increases strength
Textbook author:
Dr. Sturdevant
Demineralization of occurs at pH:
4.5
Patient comes in with sensitivity and you had a and you have done a class V the day before and margins are sealed:
dentin tubules exposed during polishing
Patient comes in with a small DO what do you recommend ad why?
composite to conserve tooth structure
What increases surface area for bonding?
???
Which of the following determines the success of a class II restoration?
moisture control
Which liner do you use if your class II went too deep?
vitrebond
Which of the following is most damaging to the periodontium?
overcountouring of a class V
To increase dentin bonding you would use:
35% phosphoric acid
Where does adjeasibe bond best?
intertubular dentin
What tooth # would have pulp exposure if prepared perpendicular to long axis of tooth?
28
Highest bonds achieved on enamel etching?
type I honeycomb
From occlusal view, axial wall I class I prep looks:
convex
Unfilled resorption is caused by:
overreaching
Dr. Murphy likes to use what for class III with inflammation?
tofflemeyer
What preparation would you use for a typical chipped front tooth
Class IV
What type of prep would be used for a carious lesion in the gingival 1/3 of the tooth?
class V
When do we not bevel in a class V preparation?
when we are below the CEJ
Flexure and fatigue of enamel and dentin, caused by occlusal forces:
abfraction
Feldspathic porcelain examples:
Vita and sirona blocks (tied)
Leucite reinforced example:
IPS Empress (tied)
Lithium discilicate example:
E MAX (tied)
Should teeth whitening be done before or after veneer placement?
before!
Where can you NOT put veneers?
highly fluorinated teeth or primary teeth
With direct composite veneers what polishes best?
microfill composite resin
What would you use for a class II Sub-G with bleeding?
tofflemire
Which of the following should you NEVER bevel at the gingival margin?
porcelain inlay
What is the LEAST desirable finish for a porcelain veneer?
lingual with feathered edge
What is the single best risk factor for caries?
current caries
What hypothesis do we currently believe?
specific plaque hypothesis
What is the best prevention for pit and fissure caries?
fluoride and sealants
Enamel dimineralization occurs at what pH?
5.5
Dentin demineralization occurs at what pH?
6.2
describe the progression of caries at the smooth surface: Describe the progression of caries at the root surface:
slow; fast (because of dentin)
Put the following in order:
- pummice
- shade selection
- rubber dam
- etch
- shade selection
- pummice
- rubber dam
- etch
What should be done if the prep exceeds 2/3 distance between central groove and cusp?
onlay
Material to be used to build up on top of a a pin that is 1 mm above the alveolar crest
amalgam
You would find the unbeveled sides in a class II prep at the enamel rods at the ___. The highest bond strength is at enamel ___.
sides; ends
Check occlusion before you prep. Check occlusion after restoration is completed.
both statements true
least common finish line for porcelain veneers:
supragingival
Why do you do dovetails for inlays?
prevents proximal dispalcement
What is true about dentin and what we want to bond to it:
dentin with sound collagen fibrils
What is in your saliva that helps remineralization?
phosphate
