class V glass ionomer

Class V

Where? Most common present on?

Gingival 1/3 of facial or lingual of any anterior or posterior tooth

more common on facial surfaces

5 indications for class V restorations

Abrasion, erosion, caries, prosthetic considerations, abfraction

Very sensitive and/or large amounts of tooth structure missing?

no symptoms or minimal damage ?

If sensitivity is main complaint and accompanied by minimal amount of tooth loss, ?

Restored

no treatment

Use desensitizing agent, such as fluoride, strontium chloride, silver nitrate

carious or non?

non

carious or non?

carious

carious or non?

carious

Gen principles of class V glass ionomer preps

• All friable/weakened (unsupported) enamel should be ?

• Do not extend to ?

• When possible, preserve structure beyond ?

• __ curves, no ?

• Pulpal depth __ bulk for strength (__ mm from DEJ)

• __ degrees cavosurface margin (no _)

• bur should always be __ to surface you are cutting, and _ to enamel rods

• removed

• Unaffected surfaces

• line angles

• smooth, sharp edges

• uniform, 0.5 mm

• 90, bevels

• perpendicular, parallel

Class V black’s prep:

__ shape

kidney bean

enamel rods

Class V - Blacks Prep

Internal Form

• All external walls are __ to the external tooth structure, thereby _ the enamel rods

• Extend the prep incisally, gingivally, mesially, and distally until all external walls are positioned in sound tooth structure at pulpal depths ranging from ___ mm at gingival wall to __ mm at incisal/occlusal wall

• Axial wall

  • Depth of __ inside the DEJ

  • Follows the contour of the ?

    • __ mesio-distally, leaves dentin bulk for ?

    • Roughly __ to external tooth surface occluso-gingivally

• orientation of walls

  • All four walls must meet the cavosurface at __ degrees

  • All walls will __ from axial wall to the cavosurface

• perpendicular, parallel

• 0.75 mm to 1.25 mm

• 0.5 mm

• DEJ

  • convex, pulp protection

  • parallel

• 90 degrees

• Diverge

Do we need retention in class V glass ionomers restoration?

No

Class V basics: outline form (sim lab) vs clinic

Extend to line angles, clinical extend to only enough to remove caries + unsupported enamel

Class V outline form: in clinical situations:

• mesial, distal, occlusal/incisal, ginigval extensions will purely be defined by ?

  • Taking into consideration resistance form, retention form, convenience form

extent of lesion

Class V basics: resistance form

• __ internal line angles

• __ axial wall follows ? (?)

• Mesial, distal, gingival, and incisal walls ___ to enamel rods and perpendicular to external tooth surface (slight divergence)

• Axial depth at ___ mm incisally//occlusally and __ gingival

• rounded

• smooth, curvature of tooth, (convex)

• Parallel

• 1-1.25 mm, 0.75 -1.0 mm gingival

Class V basics:

Convenience form (clinical): cavosurface margin extensions __ to place restorative material

sufficient

class V GI prep:

• Establish outline form:

  • Use a #____ or #___ bur for initial access and to develop __ internal line angles

  • Use a __L carbide bur to develop _ prep of walls

  • Extend to mesial and distal __ __

  • ___, flowing __ (kidney bean shape)

  • Positioned __ mm supragingival, _ incisal/occlusal-gingival height (dependent on tooth)

• Establish __ axial wall

  • Axial depth at ___ mm incisally/occlusally and __ mm gingival

• #2, #330, round

• 169L, divergent

• Line angles

• Smooth, curves

• 1 mm, 1.5-2 mm

• convex axial wall

• 1-1.25 mm, 0.75-1mm

In clinc what to you do (not in sim)? WHy?

conditioner for 10 s: cleaning effect, rinse, remove excess moisture with high speed suction, then form prep with microbrush to leave moist surface

In natural teeth, the dentin should be ___

In sim clinic, the prep should be __

moist, dry

RMGI working time

3 min + 15 s

Light cure for how long?

20 seconds (two beeps)