Treating Class II Caries Flashcards
Class 2 caries involve the ______ surface of ____ teeth.
proximal
posterior
Radiographic exams are an adjunct to clinical examination. How often are anterior radiographs needed?
- every 5 years as part of Full mouth series
- on an individual basis as needed based on symptoms
How many radiographs are in a full mouth series? How many bitewings?
8 posterior PA’s, 4 bitewings, 7 anterior PA’s, 1 pano = 20
4
How often are bitewings taken?
every 2 years ( more frequently if caries are high)
Give a method that can assist with clinical examination of caries.
transillumination
How do proximal caries appear clinically?
opaque white
Deciding whether or not to treat caries will depend on direct evidence and clinical _______.
judgement
- past caries experience
- rate of caries progression
- location and surrounding teeth
What are the possible consequences of the “decision to treat” caries?
- damage to adjacent teeth (especially with small preps)
- restorations have limited lifetime (all eventually fail)
- weakening of the remaining tooth structure
What are the three approaches for class 2 preparations? Which is most common? Which is used more often for root caries?
- Occlusal
- Facial
- Lingual
- Occlusal is most common
- Root caries: Facial or Lingual because the FGM recedes and provides better access and maintains the marginal ridge.
True or False: The marginal ridge must be removed for the occlusal approach to class 2 preparation.
True
True or False: The occlusal approach removes significant amounts of unaffected dentin.
True
For a conventional Box-Only preparation, start in the center of the B-L width of the contact area, then move the bur in a direction _________ to the proximal surface.
perpendicular (parallel to enamel rods)
For the box of a class 2 preparation, which contact is usually left much tighter? What is the minimal clearance amount (ideal)?
buccal
0.5 mm (or extend to encompass all affected dentin)
For retention, the box _______ occlusally.
converges
True or False: Retention grooves may be placed to aid in retention and resistance.
True
What is the “primary function” of the matrix band?
restore anatomic contour and contact
by acting as a “form” into which the material is placed
The open face of the matrix band clamp is placed ______ the gingival sulcus.
toward
What is placed after the matrix band, prior to amalgam placement?
WEDGE
- adapts to gingival area
- prevents extrusion of material
- slightly opens contact
True or False: For proper amalgam placement, a coronal force is required to properly adapt into retentive groves.
False, need LATERAL forces to adapt into grooves
The ______ must be carved down prior to removal of the matrix band. Why?
marginal ridge
- form the embrasure
- create a MR height similar to adjacent tooth
What are the three steps in initial tooth preparation?
- Outline Form & Initial Depth
- Primary Resistance Form
- Primary Retention Form
(“s” before “t”…resistance before retention)
Which “form” prevents movement during occlusal forces?
resistance form (oblique and apical movement, occlusal)
For step one of tooth preparation (Outline/depth), where do you place the margins? What is the initial depth?
-margins placed where they will be in the final prep
-initial depth = 0.2-0.8mm into dentin
(axial PM: 1 mm, axial molar: 1.5mm, gingival: 3mm)
What is the difference between a conventional Class II amalgam and conventional Class II composite?
similar preparations
However…the walls for a composite can be more parallel and breaking contact on the buccal wall is not required
