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BDS2 OSCE Prep - Bonding To Teeth OSCE

Nursing10 CardsCreated 3 months ago

This deck covers key concepts related to dental bonding techniques, focusing on the differences between bonding to enamel and dentine, the role of etching, and the function of dental bonding agents.

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why is bonding to enamel easier than bonding to dentine?

Enamel is highly inorganic and dry
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Key Terms

Term
Definition
why is bonding to enamel easier than bonding to dentine?
Enamel is highly inorganic and dry
what is normally used to etch enamel and dentine?
35% Phosphoric Acid
what happens when enamel is etched?
The acid roughens the enamel surface and increases the surface energy by removing contaminants - better wettability of enamel allows resin to adapt in...
what is the composition of dentine?
20% organic (mostly collagen) 70% inorganic (mostly hydroxyapatite) 10% water
why is dentine so hard to bond to?
dentine is WET (because of permeable tubules) and has a LOW SURFACE ENERGY - presence of smear layer also makes it hard to bond to
why will composite materials not stick to wet dentine?
because wet dentine has a LOWER SURFACE ENERGY than composite materials - for composite to stick, you have to make the dentine surface energy higher t...
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BDS2 OSCE Prep - Bonding To Teeth OSCE
TermDefinition
why is bonding to enamel easier than bonding to dentine?
Enamel is highly inorganic and dry
what is normally used to etch enamel and dentine?
35% Phosphoric Acid
what happens when enamel is etched?
The acid roughens the enamel surface and increases the surface energy by removing contaminants - better wettability of enamel allows resin to adapt into the roughness
what is the composition of dentine?
20% organic (mostly collagen) 70% inorganic (mostly hydroxyapatite) 10% water
why is dentine so hard to bond to?
dentine is WET (because of permeable tubules) and has a LOW SURFACE ENERGY - presence of smear layer also makes it hard to bond to
why will composite materials not stick to wet dentine?
because wet dentine has a LOWER SURFACE ENERGY than composite materials - for composite to stick, you have to make the dentine surface energy higher than that of the composite material
what is the main purpose of dental bonding agents?
they INCREASE THE SURFACE ENERGY of dentine which allows composite to flow and stick to the surface
what is the Smear Layer?
an adherent layer of organic debris that remains on the dentine surface after preparation (usually contaminated with bacteria)
what does Acid Etching do to dentine?
REMOVES THE SMEAR LAYER - opens dentinal tubules by removing smear plugs
how is the HYBRID LAYER formed?
dentine is etched and the smear layer/smear plugs are removed primer is able to flow into demineralised dentine and form a micro mechanical bond (collagen + resin)