DEN 101 Test 4 Study Material

Define Cavity Preparation

mechanical alteration of a defective, injured, or diseased tooth to best receive a restorative material which will re-establish the normal form, function and esthetics (removal of decay)

Axial Wall

runs vertically (composed of enamel and/or dentin)

Pulpal Floor

above the pulp

What is known as the most common area where liner is placed?

the axial wall

Gingival Floor

located in the bottom of the proximal box

Cavosurface Margin

angle formed by junction of the wall of the preparation and the untouched surfaces of the tooth

What walls are parallel to the long axis of the tooth?

axial

What walls are perpendicular to the long axis of the tooth?

• pulpal

• gingival

How are walls named?

according to the surface of the tooth it is nearest to

What two walls are also floors?

pulpal and gingival

Line Angle

junction of two walls

Point Angle

junction of three walls

What walls are within the cavity preparation?

both external and internal

Indirect Pulp Cap

liner is placed over pink area

Outline

• pattern

• initial preparation

• designates overall shape of cavity preparation

What is the Cavity Design Outline Determined By?

• extent of decay

• type of restorative material being used

• retention needed for restorative material

External Outline

marginal boundaries

Internal Outline

shape of internal form of the preparation

Resistance

internal shape of cavity preparation that protects the tooth and the restorative material from stresses of mastication

Retention

internal shape of cavity walls that retains the restoration

Convenience Form

cavity altered for easy accessibility for the insertion of restorative material

(beyond outline form)

Pulpotomy

removal of coronal portion of pulp in the tooth

Pulpcectomy

removal of all pulp

Acid, Etch, Prime, Bond Sequence

• prep

• etch

• prime

• bond

What is a triturator used for?

used to mix amalgam

What cavity classifications are restored with amalgams?

I, II, V

What is retention in cavity design for amalgams?

mechanical retention (undercuts/grooves)

Cavity Classifications Restored With Composite

I, II, III, IV, V

What liners are used under amalgam?

• Calcium Hydroxide

• Glass Ionomer

• Varnish

What bases are used under amalgam?

• ZOE

• Zinc Phosphate

• Polycarboxylate

What is used to pack amalgam?

condensers (pluggers)

What is used to carve amalgam?

discoid-cleiod carver

What materials are NOT used under composities?

• ZOE

• Varnish

How is occlusion checked after a freshly placed amalgam is inserted?

articulating paper

How are amalgam high spots removed?

• carvers

• burs

Where are used wedges and used metal matrices disposed?

sharps container

Purpose of matrix

acts as temporary wall to hold restorative material in place while a tooth is being filled

Requirements of a properly positioned matrix

• snug fit

• contoured to natural shape of tooth

• sealed at gingival margin

How many wedges should be used on a class I restoration?

none

When is a matrix used?

when one or more axial surfaces (interproximal walls) are removed (mesial and distal surfaces)

Three Functions of matrix and wedge

• temporary wall to pack material against

• restore contact at proximal surface

• create external outer surface

What does the type of matrices depend on?

• type of material the tooth is being restored with

• doctors preference

• access to preparation

What aspect are wedges placed from?

lingual aspect

What is a retainer?

the device that holds the matrix band

Regular gauge

.002

Ultra thin gauge

.0015

What is the diagonal slot of the retainer placed towards?

gingiva

What does burnishing the matrix band do?

gives the convex area back to the tooth

Gingival Edge

more narrow

Occlusal Edge

wider

Spindle Pin

• secures band in place

• stabilizes band in holder

• diagonal slot is placed toward the gingiva

Outer Slot/Guide Slots

• straight slot

• right and left slots determine quadrant

Diagonal Slot

• receives ends of band

• slides up and down on spindle

• matrix band is placed in slot

Inner Knob

• adjusts size of the loop of the matrix band to fit around the tooth

• loosens band for removal

Outer Knob

• positioned at end of spindle

• tightens/loosens matrix band in retainer

What side of the tooth is the retainer usually positioned on?

the buccal side of the tooth

Enamel Wall

portion of a prepared external wall that is made of enamel

DA II Functions during Composite and Amalgam Procedures

• placing and shaping composite fillings

• packing and carving amalgam

• taking final impressions

• placing matrix bands and wedges

Where is the first increment placed in a MOD prep?

at the proximal box to avoid any voids at the interproximal area

What should be transferred to the operator while the amalgam is mixing and why?

condenser should be transferred so the amalgam can be condensed quickly (amalgam starts to harden quickly after being mixed)

What is amalgam bonding agent, how and why is it used?

• substance that is used to bond amalgam to tooth structure

• helps reduce some of amalgams shortcomings (inability to bond to enamel/dentin and amalgams tendency to leak)

• placed right before amalgam is placed

When is the small condenser used?

when condensing material into the proximal box

Shade Selection Criteria

• done prior to isolation and anesthetizing

• utilize shade guide for the type of restorative material being used

• selection made under natural light

DA II Functions During Amalgam Procedures

• loading amalgam carrier

• matrix and wedge placement

• placing liner/base/varnish

When is it necessary to use a matrix band and retainer?

when a tooth needs a filling interproximally so that it can act as a temporary wall

Layering concept of liners, bases, and varnishes

liner then base then varnish

What could a BP handle and #12 blade be used for?

removal of excess composite material

Direct pulp cap

liner is placed directly onto exposed pulp to help protect and stimulate healing

Why use calcium hydroxide in a cavity preparation that is deep?

• it can be soothing

• provide protection from bacteria

• stimulate secondary dentin

Cavity Box

space created by the removal of decay that is prepared to receive a restorative material

What is the purpose of a wedge?

create space between teeth and ensure the matrix band is fitting properly so that it provides contour

What does a wedge prevent?

overhang