Day 2 Lecture 1.5

Question 1

Class V prep

Answer 1

lesions involve smooth surfaces apical to the height of contour on the facial and lingual surfaces of all teeth.

Question 2

Ideal/small lesions (classical/more conservative)

Answer 2

Cervical/ apical to the height of contour, Confined between mesial and distal line angles, Do not extend to the cemento-enamel junction

Question 3

Non ideal lesions/modified

Answer 3

Extends to HOC/occlusal to HOC, Extension into mesial and distal, extension to become root surface caries (into CEJ).

Question 4

Axial depth

Answer 4

Exactly what it sounds like. Class Vs require a certain depth. For amalgam, uniform depth needed - must go 0.5 mm past DEJ in small cavity prep (usually around 1 mm).

Question 5

Restorative material for class V

Answer 5

amalgam, tooth colored restorations (4 of them).

Question 6

Amalgam as a material

Answer 6

Unaesthetic, requires butt joint margin, uniform axial depth, secondary retention (reinforcement - requires more tooth to be removed). More forgiving in terms of moisture, which is why it is used often for class V. Must be 1 mm in depth.

Question 7

Tooth colored restorations

Answer 7

Composites, compomers, glass lonomers, resin modified glass ionomers.

Question 8

Class V prep shape

Answer 8

Kidney

Question 9

Thickness of enamel

Answer 9

tapers near CEJ - uneven thickness changes prep shape.

Question 10

Enamel rod direction

Answer 10

Run at around 90 degree angles to tooth tangent. Interior may be different. As such, cavity walls must be near parallel to original enamel surface. Oblique, horizontal, vertical.

Question 11

Axial depth

Answer 11

Clinically has to be 0.5 mm into dentin. Incisal is around 1.25, gingival is around 1 mm. Convex due to following tooth contour.

Question 12

Secondary retention

Answer 12

Retention grooves - made at the line angles of the prep. *class v do not have primary retention measures.

Question 13

330 tip

Answer 13

Does not cut.