Lab 1 Flashcards
T/F. The conservative class I restoration is indicated for small carious lesions that progress into dentin.
True.
What is needed be considered a restoration?
the preparation must extend into dentin
If the preparation does not extend into dentin, then it is a ___.
sealant
What are the indications for conservative class I composites?
- small, well-defined carious lesions
- enamel defects
- incipient lesions
- suspected carious lesions
What is the technique for doing a conservative class I composite?
- LA
- rubber dam
- remove caries
- remove debris (rinsing and drying)
- etch (15 secs)
- rinse (5 secs), dry tooth
- bond (prepped AND un-prepped pits and fissures)
- composite
- sealant
- check voids
- remove rubber dam
- occlusion
- post-op instructions
Dry tooth until the entire etched surface has a ___, ___ appearance.
dull; whitish
T/F. Bond is only applied to the prepped pits and fissures.
False, apply it to prepped and unprepped pits and fissures
Primary teeth have ___ enamel and dentin thickness than permanent teeth.
thinner
T/F. the pulps of primary teeth are larger in relation to crown size than permanent pulps.
True.
The ___ ___ of primary teeth are closer to the outer surface of the tooth than permanent pulps. The ___-___ pulp horn is the most prominent.
pulp horns; mesio-buccal
In primary teeth, the enamel rods to the ___ third of the crown extend in an ___ direction from the DEJ.
gingival; occlusal
This is in contrast to the permanent dentition in which the rods extend in a cervical direction
Primary teeth have ___, ___ proximal contacts.
broad, flat
T/F. Primary teeth are whiter in color than their permanent successors.
True.
Primary teeth have relatively ___ occlusal surfaces compared to their permanent successors.
narrow
T/F. It is necessary to break contact at the buccal and lingual proximal line angles.
False, it is not necessary
T/F. Three surface (MOD) restorations are preferred.
False, in primary teeth many practitioners limit class II composite restorations to relatively small TWO surface restorations.
What is used because it is a more durable and predictable restoration for large and multisurface caries restorations?
stainless steel crowns
T/F. Buccal or lingual retentive grooves should be placed in the proximal box.
False, NO buccal or lingual retentive grooves should be placed in the proximal box.
The buccal and lingual walls should create a ___ degree angle with the enamel.
90
The mesio-distal width of the gingival floor should be ___ mm, which is approximately equal to the width of a No. ___ bur.
1; 330
The ___ margin should be placed out of stress-bearing areas, with no ___.
cavosurface; bevel
The box should be __ of the intercuspal width, and the bucco-lingual walls should ___ slightly in an occlusal direction.
1/3rd; converge
What are some common errors in class II composite preparations?
- walls that don’t converge due to improper angulation of the bur
- box too wide
- box too deep, resulting in pulpal exposure
- penetration of the tooth at the constriction
Why are primary molars often penetrated at their constriction?
because of the prominent cervical bulge, increasing the depth of the gingival floor can result in this.
