lectures Flashcards
How to do a class II prep
Set out armamentarium sit correctly look at prep isolate clean and dry check for base or liner need Place sectional matrix Place wedge place sectional matrix ring use ball burnisher for proximal contact do marginal ridge first, then everything else remove ring, wedge, and matrix band to check for proximal contact
when to place a liner
Deep filling
why place a liner
Protect the pulp and reduce post-operative sensitivity
what liner is used in clinic
Resin-modified glass-ionomer cement (vitrebond)
How to condense composite
you cannot
How long to light cure
20 seconds
how does one remove any gingival flash
a number 12 blade
what is a contra-indication for using composite
Operating field that cannot be isolated
High caries risk
what determines the preparation features
Choice of restoration material
what must be done for an amalgam restoration
Adequate depth of 1.5-2mm for compressive strength
diverting walls
what must the cavosurface margin do for an amalgam restoration
Enamel and amalgam must have amarginal configuration of 90 degrees and
How is amalgam head to the tooth
Mechanically locked inside the tooth
how is composite held into the tooth
by micro-mechanical retenetion of the bonding agent
Roll of Primary restistance form
Helps the restoration and tooth resist fracture due to occlusal forces
Parts of Primary resistance form
Conserving sound tooth structure, cusps, and marginal ridges
Preparing pulpal and gingical walls perpendicular to the occlusal forces when possible
Rounding internal prep angles
removing unsupported weak tooth strucutre
Roll of Conveneince form
Makes the procedure easier and more accessible
What does Convenience form consist of
Clearance from the adjacent teeth
Extension of the walls to provide greater access for caries excavation
how does one prep for a composite
Pulpal and axial depth are directed by the depth of the lesion
Proixmal extensions dictated only by the extent of the lesions
Removal of undermined cavosurface margin
burs to use for a composite
first use round bur to get out defects
removal undermined cavo-surface margins with a straight bur
How to see interproximal caries
Bitewing radiographic examination
Clinical examinations (adjunct to radiographic exam)
(transillumination also)
when to use a box only prep
When only the proximal surface is defective with no lesion on the occlusal surface
are leaks worse for composite or amalgam
worse for amalgam
when is it good to use flowable composite
little occlusion with deeep grooves
what should be used if pulp exposure
Dical (CaOH)
why use a liner
releases F
Block tubules
breaking contact for composite slot preps
no need to break contact because compoite already binds to the tooth
when would one do a small II small restoration slot prep
indicated when access to the lesion can be obtained directly from facial or lingual
when final cavity doesn’t undermine the marginal ridge
how does a class II moderate/large restoration look
like a Traditional class II amalgam prep
do you go through the marginal ridge when doing a slot prep from the facial and lingual
no!
how to get contact with composite
use an advanced sectional matrix system
when can a tofflemire retainer be used for composite
when the prep doesn’t break call contacts
