Adhesion, Acid Etch and Dentine Bonding Flashcards
what do adhesive materials offer potential to do in dentistry?
- seal vulnerable pits and fissures
- conserve tooth tissue
- reduce microleakage
what are the 3 approaches to achieving adhesion?
- micromechanical attachments via acid etch
- chemical adhesion to enamel/dentine via coupling agents
- wetting, penetration, formation of interface via dentine bonding agents
what does applying acid etch achieve microscopically?
selective decalcification of enamel prisms
what are the benefits of acid etching?
increases surface roughness
removes surface contaminants
what are the steps for etching?
etch, wash, dry
what occurs if the etch is left for too long?
it will allow re-precipitation of calcium and phosphate
what is the ideal etch time?
10-60 seconds
what the chemical composition of acid etch?
37% phosphoric acid
describe the ideal dental adhesive
- high bond strength to enamel and dentine
- immediate, durable and reliable bond
- prevent bacterial ingress
- safe and simple to use
what occludes the dentine tubules after cavity preparation?
a smear layer
what must not be done to remove the smear layer on dentine and why?
air dry because dentine is a vital tissue and this will hurt the patient A LOT
what is a dentine conditioner?
an acidic substance that opens the dentine tubules
what is a primer?
acts as an adhesive, MRX dissolved in volatile solvent
what is the name of the material that flows into the dentine tubules?
sealer - resin
