Class V Cavity Preparation Flashcards
Class V cavity preparations are just apical to the _____ __ ______ on the facial or lingual surfaces of all teeth/
Height of Contour
What are the parameters for an ideal / small lesion?
1.
2.
3.
- Cervical / apical to the height of contour
- Confided between medial and distal line angles
- Do not extend to the CEJ
What are non-ideal lesions?
1.
2.
3.
- Extends past height of contour
- Extension to medial or distal
- Extension to become root surface caries
What walls will you see on a Class V cavity prep?
- Gingival
- Occlusal / Incisal
- Mesial
- Distal
- Axial wall
Clinically the shape and size of class V (What 4 things does the outline depend on?
- Extent of lesion
- Preexisting restoration
- Location of lesion
- Restorative material of choice
Amalgam for class V preps is good and bad because
Good: more forgiving to moisture, very strong
Bad: you have to have converging walls, and an ideal axial depth, it does not bond to tooth structure
What shape is an ideal class V?
Kidney or trapezoid shape
The axial wall should have what shape?
Convex
What area is the enamel the thickest?
Toward the incisal / occlusal
What are the directions of the enamel rods?
Horizontal and diverge externally
What depth on the axial wall is ideal for a class V prep?
Dentin?
Incisal wall?
Gingival wall?
Dentin: .5mm
Incisal: 1.25mm
Gingival: .75mm
What walls require a retention groove for an ideal class V?
Axiogingival line angle
Axio-occlusal line angle
What dental layer is the retention groove?
Dentin
What bur do we use for the retention groove?
1/4 round bur
What is the diameter of the 1/4 round bur?
.5mm
