Operative Flashcards
Etching function
37% phosphoric acid
removes the smear layer, creates micro porosities, and widens dentinal tubules, all of which help create a micromechanical bond between the tooth and composite.
Opalescence
describes the effect of a translucent material appearing blue in reflected light and red-orange in transmitted light.
What’s buttjoint
90 degree
Composite shade 1-4 represents
1 = least chroma and highest value
4 = high chroma and low value
Cracked Tooth syndrome
- Mandibular second molars
- Mandibular first molars
- Maxillary premolars
Galvanism
of the amalgam refers to the generation of an electric shock due to the contact of the metal amalgam with another metal
What’s sandwich technique
the subgingival portion is restored with a glass ionomer cement, which creates a floor above the gingiva that can be isolated properly for a resin composite restoration.
What’s the role of CaOH2 liner
to rebuild dentinal bridge
- it is alklaine (12.5)
Does abfraction have caries?
they are non-carious cervical lesions caused by occlusal forces
How many phases of gamma in amalgam
3
gamma 1 phase
2nd phase
with the silver alloy. It is not as strong as the gamma phase, but it is still relatively strong and resistant to corrosion.
Gamma-2
the third phase of the reaction and is the result of mercury reacting with tin. This phase is quite weak and easily corrodes.
gamma
1st phase
the strongest phase is the gamma phase, which is the silver alloy. The gamma phase also has the least amount of corrosion.
type of margin type
1. gold
2. PFM
3. All ceramic
Gold:Knife-edge
Porcelain-fused metal (PFM); Deep chamfer
All-ceramic: Rounded shoulder
Tooth flexure causes?
abfraction or wedge shape cervical lesions. results from excessive occlusal forces
