conservation Flashcards
difference between secondary and tertiary dentine
secondary = deposited with aging tertiary = deposited as a response
when should bitewings be taken to monitor careis
low risk = 2year
moderate risk = annually
high risk = 6month
why is dentine bonding variable
living, wet, mutable tissue
how does enamel etching + bond work
etch means bond can micromechincally bond to tooth
bond then chemically bonds restorative material
when should etching time of dentine be increased? and the surface roughened?
if dentine exposed to oral cavity for long time (e.g. TSL) sclerosed dentine will have been played down (glassy + dark)
why must early bond strength be high
to resist polymerisation shrinkage of restorative materials
advantages of fillers being added to composite
reduces polymerisation shrinkage
improves strength, rigidity, wear, fracture resistance, reduce thermal expansion
which are the functional cusps
buccal of lower
palatal of upper
except in cross bite
minimum thickness of RBB wing
0.7mm to reduce flexure + risk of debonding
