Cavity Preparation Flashcards
Name the G.V. Black classification of caries:
Carious lesions affecting
1. Fissures and pits
2. Occlusal thirds of premolars and molars
3. Buccal and lingual pits of molars
4. Linguals pits of upper incisors
Class I
Name the G.V. Black classification of caries:
Carious lesions affecting:
- proximal surfaces of posterior teeth (molars and premolars)
Class II
Name the G.V. Black classification of caries:
Carious lesions affecting:
- proximal surfaces of anterior teeth (incisors and canines) WITHOUT the involvement of the incisal edge
Class III
Name the G.V. Black classification of caries:
Carious lesions affecting:
- proximal surfaces of anterior teeth WITH involvement of the incisal edge
Class IV
Name the G.V. Black classification of caries:
Carious lesions involving the:
- gingival third of facial and lingual surfaces of any tooth along the gumline
Class V
Class V lesions are a frequent site of decay for individuals with _______________ or _______________.
poor oral hygiene or exposed root surfaces
Name the G.V. Black classification of caries:
Caries involving the:
- Incisal edge of anterior teeth (incisors and canines)
- Cusp tip(s) of posterior teeth (premolars and molars)
Class VI
What are class VI lesions often caused by?
initial abrasion and erosion
In a completed cavity preparation, there is a ____________ outlining the preparation containing the external and internal preparation walls.
cavosurface margin
the junction of the cavity preparation and the external tooth surface
cavosurface margin
refer to the distinct walls which contact with an edge with the cavosurface margin, named according to the outer tooth aspect that they are parallel and closest to
external walls
Internal walls are classified based on their plane of dimension:
- Wall that runs parallel to the long axis of the tooth?
- Walls that runs perpendicular to the long axis of the tooth along the base of the prep and above the pulp chamber
Axial wall
Pulpal wall/floor
The junctions of preparation walls are also named based on their intersecting walls:
Where 2 walls meet?
Where 3 walls meet?
line angle / point angle
8 steps of a cavity preparation according to G.V. Black:
- Outline form
- Resistance form
- Retention form
- Convenience form
- Removal of remaning caries
- Pulp protection
- Secondary retention and resistance form
- Finishing of external walls
establishes the external outline of the preparation and cavosurface margin, determined by the extent of carious lesion
outline form
Requirements of the outline form of a prep include:
- Initially extend ______mm into the dentin of sound tooth structure just below the DEJ, only extend depth if deeper caries exist
- For Class IIs, extension of gingival floor to get _____mm clearance with adjacent tooth
- Removal of ________ enamel
0.2mm / 0.5mm / unhealthy (friable enamel, unsupported enamel)
What is the exception to the rule that says facial and lingual proximal walls require an extension of 0.5mm clearance to the adjacent tooth?
if it would require an unnecessary removal of sound tooth structure to open the contact
demineralized enamel which cannot be effectively bonded
friable enamel
enamel with no underlying dentinal support which cannot support cyclic loading
unsupported/undermined enamel
a design developed to allow for the tooth and restoration to withstand the forces of mastication and not fracture, prevention of the tooth or restoration from OCCLUSAL forces
primary resistance form
Requirements of this include:
- horizontal and flat gingival and pulpal floors
- rounded internal line angles to reduce stress concentration
- preservation of cusps and marginal ridges to maintain tooth strength
primary resistance form
Preservation of cusps and marginal ridges is important in maintaining the tooth’s strength. Consider capping the cusp when…?
the extension is greater than half the distance from the primary groove to the cusp tip.
refers to design features that prevents the displacement of restorative material during function
primary retention form
Requirements of this include:
- occlusal surface preps must have external walls to prevent occlusal displacement
- dovetail feature to prevent proximal displacement
primary retention form
