Enamel Bonding at National College For Medical And Technical Studies | Flashcards & Summaries

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Lernmaterialien für enamel bonding an der National College for Medical and Technical Studies

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what is enamel made up of
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96% mineral
1%organic 
3% water
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the major crystals found in enanel are
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hydroxyapatite crystals which are packed tightly to form prisms
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what is acid etching used for
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to dissolve the hydroxyapatite crystals in the outer surface of enamel
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what are the main effects of etching
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-increase the surface roughness of enamel at microscopic level
-raising the surface energy which improves wettability
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how many patterns of etching enamel are there and which is the most common type?
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3 types the most common typr being type 1
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describe type 1 pattern of etching enamel 
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involves removal of enamel prism cones where the prism peripheries remain intact
 -enamel surface etched with 35% and 10% phosphoric acid for 15 and 60seconds
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describe type 2 pattern of etching enamel
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the opposite of type 1, involves removal of the peripheries with the cores being left intact 
-enamel surface etched with 10% maleic acid gel for 15 seconds
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describe type 3 pattern of etching enamel
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contains areas which resemble both type 1 and type 2 along with some less distinct areas
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how long should acid etch be applied for?
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-application of acid ranges from 15 to 60 seconds
-15 seconds for dentin, 30 for enamel , 60 deciduous teeth
 -30-40% phosphoric acid used with 37% being most common

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clinical procedure of acid etch
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-acfter acid application the acid shoukd be washed and surface dried 
-white chalky appearance of enamel is the result
-adhesive applied to wey the high surface energy enamel and penetrate micro cavities and fill it
-adhesive is polymerized and interlock in these micro cavities 
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what to do if etched enamel is contaminated (by blood, saliva, etc)
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-re etch for 10seconds
-teeth with flourosis require longer etching time
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why are adhesives composed of bis-GMA and TEGDMA
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to decrease the viscosity to facilitate resin tags formation
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  • 740 Karteikarten
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  • 13 Lernmaterialien

Beispielhafte Karteikarten für deinen enamel bonding Kurs an der National College for Medical and Technical Studies - von Kommilitonen auf StudySmarter erstellt!

Q:
what is enamel made up of
A:
96% mineral
1%organic 
3% water
Q:
the major crystals found in enanel are
A:
hydroxyapatite crystals which are packed tightly to form prisms
Q:
what is acid etching used for
A:
to dissolve the hydroxyapatite crystals in the outer surface of enamel
Q:
what are the main effects of etching
A:
-increase the surface roughness of enamel at microscopic level
-raising the surface energy which improves wettability
Q:
how many patterns of etching enamel are there and which is the most common type?
A:
3 types the most common typr being type 1
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Q:
describe type 1 pattern of etching enamel 
A:
involves removal of enamel prism cones where the prism peripheries remain intact
 -enamel surface etched with 35% and 10% phosphoric acid for 15 and 60seconds
Q:
describe type 2 pattern of etching enamel
A:
the opposite of type 1, involves removal of the peripheries with the cores being left intact 
-enamel surface etched with 10% maleic acid gel for 15 seconds
Q:
describe type 3 pattern of etching enamel
A:
contains areas which resemble both type 1 and type 2 along with some less distinct areas
Q:
how long should acid etch be applied for?
A:
-application of acid ranges from 15 to 60 seconds
-15 seconds for dentin, 30 for enamel , 60 deciduous teeth
 -30-40% phosphoric acid used with 37% being most common

Q:
clinical procedure of acid etch
A:
-acfter acid application the acid shoukd be washed and surface dried 
-white chalky appearance of enamel is the result
-adhesive applied to wey the high surface energy enamel and penetrate micro cavities and fill it
-adhesive is polymerized and interlock in these micro cavities 
Q:
what to do if etched enamel is contaminated (by blood, saliva, etc)
A:
-re etch for 10seconds
-teeth with flourosis require longer etching time
Q:
why are adhesives composed of bis-GMA and TEGDMA
A:
to decrease the viscosity to facilitate resin tags formation
enamel bonding

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