Lecture 6 Flashcards
When do pit and fissure carried pass through the enamel?
they don’t (they are base to base)
How do caries spread at the DEJ?
laterally
T or F? S. surface carries penetrates the full thickness of the enamel.
T (2 pyramids, apex to base)
What will caries in developmental defects look like?
pyramids base to base (just like pit and fissure)
T or F? Both smooth surface carries and pit and fissure caries spread laterally along thee DEJ.
T
What class are pit and fissure caries?
Class I
T or F? All Classes of caries besides Class I can be categorized as smooth surface caries
F. Class VI was not on list
Who coined the phrase, “extension for prevention.”
G.V.Black
Explain what “extension for prevention” means.
pits and grooves should be included in the outline form to prevent them from becoming carious (not still done, we are more conservative now)
How would you classify a carious lesion on the mesial surface of tooth 30 on a developmental defect?
Class I because it is caries of a developmental defect
What class would be a lesion on the lingual surface of the Maxillary Lateral Incisor be?
Class I
How would you classify a lesion in the buccal pit of the first mandibular molar?
Class I
What types of teeth can be involved in Class II lesions?
premolars and molars
How would you classify a carious lesion that is on the proximal surfaces bw the canine and the 1st premolar?
Class II or Class III?
This caries class invovles the incisal edge corner:
Class IV
These are smooth surface caries originating in the gingival 1/3 of the facial or lingual surfaces of anterior and posterior teeth:
Class V
Incisal or occlusal wear can lead to the exposure of the dentin leading to the formation of caries, what class?
Class VI
Which class was not part of the original classification system of G.V.Black but was added later?
Class VI
Blacks steps in cavity preps:
Outline form, resistance form, retention form, convenience, form, remove remaining carious dentin, finish enamel walls and margins, cleanse cavity preparation
What is the final form of the cavity prep determined by?
extent of lesion, proximity to pis and grooves, approximating and opposing teeth, soft tissue, esthetics, restorative material
What is resistance form?
the shape and placement of the cavity walls that best enable both the restoration and the tooth to withstand occlusal forces WITHOUT fracture
What is retention form?
the shape or form given to the cavity prep that best allows the restoration to resist displacement through TIPPING or LIFTING forces
What is convenience form?
the shape or form of the cavity that allows adequate observation, accessibility and ease of operation in preparing and restoring the cavity.
When would addition carious dentin need to be removed after obtaining the convenience form?
if it were medium or large in size
How do you finish the enamel walls and margins?
unsupported enamel rods are removed, to make the lbest marginal seal bw the restorative and tooth structure, provide maximal strength of both enamel and restorative material at the margin
Step in cleansing the cavity prep:
remove all chips and debris & final inspection
For our Class I Resin Prep, how wide should the distal and marginal ridges be?
1-1.5mm wide
For our Class I Resin Prep, how wide should the bucco-lingual isthmus be?
1-1.25
What is the term for the width of the prep in the buccal-lingual direction?
bucco-lingual isthmus
For our Class I Resin Prep, the pull wall minimal depth is:
1.5mm at the central pit
For our Class I Resin Prep, the pull wall maximum depth at the triangular ridges is:
2mm
Term for the junction of the cavity prep and the tooth surface;
cavosurface margin
Term for open margins, marginal deficiencies:
sub-margination
Term for marginal excess:
flash
If the cuspal plain of your prep is concave, this means it it (over/under) contoured:
under
T or F? The final product should always have proper MIP occlusion.
F. Centric occlusion
For our Class I Resin Prep, the ideal external outline form is:
1.25mm B-L width, 1-1.5mm marginal ridge width
2 types of fissures:
I and V type
Tx for pt with deep pits and fissure w no caries:
sealants and reevaluation
Tx for pt w minimal isolated carious pits and fissures
PRR
Tx for pt w carious lesions throughout pits and fissure system:
composite resin/ amalgam
The only time you would prepare a traditional class I prep for carious lesion in pit and fissure system:
carious lesions throughout pits and fissure system
What is the most critical aspect to caries prevention with sealants?
Retention
3 goals in the placement of sealants:
repair, conserve, prevent
