Dental Materials - Bonding systems Flashcards
What chemicals interact with resin?
eugenol
hydrogen peroxide
alkaline
How can some chemicals effect resin?
interact with the camphorquinone light inhibitor
What needs to be etched for longer, dentin or enamel?
enamel
What are the advantages to a self-etching system?
combine conditioning (etching), priming and bonding in a single step
reduce work time
no post-conditioning rinsing hence less technique-sensitive
less sensitive to the wet/dryness of dentine surface
What do self-etch systems consist of?
acidic etchant to demineralise the tooth surface
linking molecule or primer and the bonding agent
solvent to carry the mixture to its site of action
What has a greater bond strength, self-etch or etch and bond system?
etch and bond system
but self-etch is fit for purpose
What do most bonding agents contain?
10-MDP
Is 10-MDP acidic or alkaline?
acidic
pH 2-2.5
What do bond strengths depend upon?
acid-etched enamel
What is a popular laboratory test for bond strength?
microtensile testing
When is the final bond strength achieved?
24hrs to 1 week
Why are the initial bond strengths lower?
due to polymerisation shrinkage
What are the 3 types of bonding agents?
three stage
two stage
one stage presentations
What is the 1 stage bonding agent?
etchant (conditioner) and mixing the primer and sealant together (1 bottle)
What are the reasons for bond failures?
