Week 5- Ch 9 Flashcards
advantages of composite
bonding to tooth structure preventing excess tooth structure removal
adequate strength
indications for class III, IV, V direct composite restoration
restoration of carious lesions
anterior enamel/dentin crown fracture
non-carious cervical defects (class V)
composites perform best when margins are tooth prep are:
in enamel
contraindications to class III, IV, V direct restoration
cannot isolate area class V that extends into root surface
why isn’t it ideal to use a non-enamel surface for composite?
composite binds best to enamel so other surfaces not as predictable or durable
area must be isolated to permit _______
effective bonding
when should shade be selected?
before tooth dehydrates and lightens
clinical procedures for class III, IV, V direct restoration
anesthetize to reduce saliva and patient comfort
occlusal assessment to determine prep design and adjust restoration’s function
select shade before tooth dries
isolate area
wedge if involving interproximal area
where should entry be in interproximal anterior tooth restoration?
lingual entry
why is lingual entry preferred?
facial enamel conserved for aesthetics
shade matching less critical
discoloration/deterioration of restoration less noticeable
when to use facial entry approach:
carious lesion positioned facially
teeth irregularly aligned
extensive carious lesion extending to facial
faulty restoration that was placed facially
mylar strip used for
class III and IV preps allows for appropriate axial tooth contours
if possible, do NOT
include entire proximal contact area
extend onto facial surface
extend subgingivally
class III tooth prep steps
remove infected dentin
pulp protection
bevel placement on accessible enamel margins
cleaning/inspecting
placement of adhesive
protect adjacent tooth with mylar strip or teflon tape
phosphoric acid gel applied to prep and extend 0.5mm beyond prepared margin
leave alone for 15s then rinse
