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TodayToday AM - Seminar - 3157AM - Seminar - 3157

Get Casts at front; Surveyors & colour pencilsGet Casts at front; Surveyors & colour pencils

Presentations and VideosPresentations and Videos Survey Class I & II Casts (no preps)Survey Class I & II Casts (no preps)

Tripod CastsTripod Casts

Get Heads & Mounts ready for PMGet Heads & Mounts ready for PM

PM - ClinicPM - Clinic Prepare guiding planes on Class I & II TypodontsPrepare guiding planes on Class I & II Typodonts

(last sheet Course Sched)(last sheet Course Sched)

FormativeFormative

Marking sheetsMarking sheets

Diagnostic Casts Mark Sheets - Hand inDiagnostic Casts Mark Sheets - Hand in

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Surveying, Path of Insertion,Surveying, Path of Insertion,

Guiding PlanesGuiding Planes

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Rule: Retentive tip should usually beRule: Retentive tip should usually be

designed to be placed in the gingival 1/3designed to be placed in the gingival 1/3

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Path of InsertionPath of Insertion

Path that the prosthesis isPath that the prosthesis is

Placed/removedPlaced/removed

Usually a single pathUsually a single path

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Advantages of a Single Path ofAdvantages of a Single Path of

InsertionInsertion

Equalizes retentionEqualizes retention

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Advantages of a Single Path ofAdvantages of a Single Path of

InsertionInsertion

Bracing and Cross-arch StabilizationBracing and Cross-arch Stabilization

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Advantages of a Single Path ofAdvantages of a Single Path of

InsertionInsertion

Minimizes torque on abutmentsMinimizes torque on abutments

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Advantages of a Single Path ofAdvantages of a Single Path of

InsertionInsertion

Allows removal without encounteringAllows removal without encountering

interferencesinterferences

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Advantages of a Single Path ofAdvantages of a Single Path of

InsertionInsertion

Directs forces along long axes of teethDirects forces along long axes of teeth

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Advantages of a Single Path ofAdvantages of a Single Path of

InsertionInsertion

Provides frictional retentionProvides frictional retention

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Selecting a Single Path of InsertionSelecting a Single Path of Insertion

Use a dental surveyor toUse a dental surveyor to

Select pathSelect path

Prepare guiding planesPrepare guiding planes

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Guiding Plane PreparationGuiding Plane Preparation Where rigid components contact abutmentsWhere rigid components contact abutments

Proximal PlatesProximal Plates Bracing ArmsBracing Arms

Rigid portions of Retentive ArmsRigid portions of Retentive Arms

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Altering Path of InsertionAltering Path of Insertion

Proximal surfaces similarProximal surfaces similarundercutsundercuts

Retentive areas similarRetentive areas similarundercutsundercuts

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Selecting a Path of InsertionSelecting a Path of Insertion

Modify tilt if necessaryModify tilt if necessary

Soft tissue interferencesSoft tissue interferences

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Selecting a Path of InsertionSelecting a Path of Insertion

Modify tilt if necessaryModify tilt if necessary

EstheticsEsthetics

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Once Path SelectedOnce Path Selected

Instructor:Instructor:

Approves pathApproves path

Demo:Demo:

- Mark heights of contour withMark heights of contour withcarbon markercarbon marker

- TripodTripod

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Optimal Path of InsertionOptimal Path of Insertion

Retentive undercutsRetentive undercutsequalizedequalized

Retentive arm has aRetentive arm has adifferent path ofdifferent path of

escapement thanescapement thanguiding plane, so itguiding plane, so itmust flex duringmust flex duringremovalremoval

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Optimal Path of InsertionOptimal Path of Insertion

Retentive undercuts equalizedRetentive undercuts equalized

Ideally, retentive arms shouldIdeally, retentive arms shouldoppose each other on oppositeoppose each other on oppositesides of the archsides of the arch

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Optimal Path of InsertionOptimal Path of Insertion

Minimize severe tooth & softMinimize severe tooth & softtissue interferencestissue interferences

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Optimal Path of InsertionOptimal Path of Insertion

EstheticsEstheticsMinimize displayMinimize display

of clasps, metalof clasps, metal

componentscomponents

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Optimal Path of InsertionOptimal Path of Insertion

Prepare Guiding PlanesPrepare Guiding Planes

Flat surfaces parallel to path ofFlat surfaces parallel to path ofinsertioninsertion

Control & limit movement ofControl & limit movement of

RPDRPD

Initial contacts for RPDInitial contacts for RPD

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Effectiveness of GuideplanesEffectiveness of Guideplanes

Most effectiveMost effective

when:when:Prepared onPrepared on

several teethseveral teeth

Cover aCover alarge surfacelarge surfaceareaarea

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Assessing Guiding PlanesAssessing Guiding Planes

ProximalView

Facial

View

Carbon

MarkingsIdealIdeal AcceptableAcceptable

TooDivergent

TooDivergent

TooShort

TooShortIdeal

Ideal AcceptableAcceptable TooDivergent

TooDivergent

TooShort

TooShortIdeal

Ideal AcceptableAcceptable TooDivergent

TooDivergent

TooShort

TooShortIdeal

Ideal AcceptableAcceptable TooDivergent

TooDivergent

TooShort

TooShort

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Preparing Guiding PlanesPreparing Guiding Planes

Select path of insertionSelect path of insertion

Design Partial DentureDesign Partial Denture **

Select number & position ofSelect number & position of

guiding planesguiding planes Prepare guiding planesPrepare guiding planes

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FINGER REST!FINGER REST!

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BursBurs

LongLongCylindricalCylindricalCarbide orCarbide orDiamondDiamond(8837K 014)(8837K 014)

8837K-0148837K-014

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Guiding Plane DimensionsGuiding Plane Dimensions

Round

Axial Line

Angles

RoundAxial Line

Angles2-4 mm1/2-1/3

height

2-4 mm1/2-1/3height

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Axial Surface Already Parallel toAxial Surface Already Parallel to

Path of InsertionPath of Insertion

NONO PreparationPreparation!!

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Polish Prepared SurfacesPolish Prepared Surfaces

Rubber wheels or pointsRubber wheels or points

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Prepare Guiding Planes FirstPrepare Guiding Planes First

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Effects of Guiding Planes OnEffects of Guiding Planes On

Retention & StabilityRetention & Stability

MaintainsMaintainsRetentionRetention

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Effects of Guiding Planes OnEffects of Guiding Planes On

Retention & StabilityRetention & Stability

Minimizes Need for RetentionMinimizes Need for Retention

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Effects of Guiding Planes OnEffects of Guiding Planes On

Retention & StabilityRetention & Stability

StabilizingStabilizingTeethTeeth

Use short guideplanes on Class I & IIUse long guideplanes on Class III & IV

Use short guideplanes on Class I & IIUse long guideplanes on Class III & IV

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Other Alterations of Axial ContoursOther Alterations of Axial Contours

Lowering Heights ofLowering Heights of

ContourContourRigid elements contactingRigid elements contacting

abutmentsabutments

Improve estheticsImprove esthetics

Prepare guiding planes -Prepare guiding planes -most efficient method tomost efficient method tolowerlower

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Other Alterations of Axial ContoursOther Alterations of Axial Contours

Raising Heights of ContourRaising Heights of Contour

Insufficient retention inInsufficient retention ingingival 1/3 (at least 1mmgingival 1/3 (at least 1mmfrom gingiva)from gingiva)

Prepare undercutPrepare undercut

Add resinAdd resinabove to createabove to createundercutundercut

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Summary of AbutmentSummary of Abutment

ModificationsModifications

After RPD DesignedAfter RPD Designed

GuideplanesGuideplanes

Lower heights of contour toLower heights of contour toeliminate interferences &eliminate interferences &improve estheticsimprove esthetics

Create undercuts if absolutelyCreate undercuts if absolutelynecessary (raising heights ofnecessary (raising heights ofcontour)contour)

Rest seat preparationRest seat preparation