04. surveying 2010

8/6/2019 04. Surveying 2010

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TodayTodayTodayToday

�� AMAM -- SeminarSeminar -- 31573157

± ± 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

�� PMPM -- ClinicClinic

± ± 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 SheetsDiagnostic Casts Mark Sheets -- Hand inHand in

�� AMAM -- SeminarSeminar -- 31573157

± ± 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

�� PMPM -- ClinicClinic

± ± 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 SheetsDiagnostic Casts Mark Sheets -- Hand inHand in

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Surveying, Path of Insertion,Surveying, Path of Insertion,Guiding PlanesGuiding Planes

Surveying, Path of Insertion,Surveying, Path of Insertion,Guiding PlanesGuiding Planes

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DefinitionsDefinitionsDefinitionsDefinitions

�� Height of contourHeight of contour�� Height of contourHeight of contour�� Undercut =Undercut =

InfrabulgeInfrabulge�� Undercut =Undercut =

InfrabulgeInfrabulge

�� SuprabulgeSuprabulge�� SuprabulgeSuprabulge

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R ule: R etentive tip should usually beR ule: R etentive tip should usually bedesigned to be placed in the gingival 1/3designed to be placed in the gingival 1/3R ule: R etentive tip should usually beR ule: R etentive 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 InsertionPath of InsertionPath of Insertion

�� Path that the prosthesis isPath that the prosthesis is

± ± Placed/removedPlaced/removed

± ± Usually a single pathUsually a single path

�� 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 of Advantages of a Single Path of InsertionInsertion


��

Equalizes retentionEqualizes retention��

Equalizes retentionEqualizes retention

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��

Bracing and CrossBracing and Cross--arch Stabilizationarch Stabilization��

Bracing and CrossBracing and Cross--arch Stabilizationarch Stabilization

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�� Minimizes torque on abutmentsMinimizes torque on abutments�� Minimizes torque on abutmentsMinimizes torque on abutments

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

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�� Provides frictional retentionProvides frictional retention�� Provides frictional retentionProvides frictional retention

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Selecting a Single Path of InsertionSelecting a Single Path of InsertionSelecting 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

��

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 PreparationGuiding Plane PreparationGuiding Plane Preparation

�� Where rigid components contact abutmentsWhere rigid components contact abutments�� Where rigid components contact abutmentsWhere rigid components contact abutments

�� Proximal PlatesProximal Plates�� Proximal PlatesProximal Plates�� Bracing ArmsBracing Arms�� Bracing ArmsBracing Arms

�� R igid portions of R etentive ArmsR igid portions of R etentive Arms�� R igid portions of R etentive ArmsR igid portions of R etentive Arms

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Other Uses of a SurveyorOther Uses of a SurveyorOther Uses of a SurveyorOther Uses of a Surveyor

�� Blocking out undesirable undercutsBlocking out undesirable undercuts

± ± Ensures the framework is not cast in anEnsures the framework is not cast in anundercutundercut

�� Blocking out undesirable undercutsBlocking out undesirable undercuts

± ± Ensures the framework is not cast in anEnsures the framework is not cast in anundercutundercut

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Selecting a Path of InsertionSelecting a Path of InsertionSelecting a Path of InsertionSelecting a Path of Insertion

�� Orient cast relativelyOrient cast relatively

horizontalhorizontal ± ± Final tilt rarely moreFinal tilt rarely more

than 10than 10°° from horizontalfrom horizontal

�� Orient cast relativelyOrient cast relatively

horizontalhorizontal ± ± Final tilt rarely moreFinal tilt rarely more

than 10than 10°° from horizontalfrom horizontal

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�� Place analyzing rod againstPlace analyzing rod against

abutmentsabutments ± ± Contact point isContact point is Height of ContourHeight of Contour

-- Below is infrabulgeBelow is infrabulge

-- Above is suprabulgeAbove is suprabulge

�� Place analyzing rod againstPlace analyzing rod against

abutmentsabutments ± ± Contact point isContact point is Height of ContourHeight of Contour

-- Below is infrabulgeBelow is infrabulge

-- Above is suprabulgeAbove is suprabulge

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��

Tilt cast to obtainTilt cast to obtainmaximum parallelismmaximum parallelism

± ± Heights of contour are atHeights of contour are atrelatively same positionrelatively same position

occlusooccluso--gingivallygingivally ± ± Equal amounts of Equal amounts of

undercutundercut

��

Tilt cast to obtainTilt cast to obtainmaximum parallelismmaximum parallelism

± ± Heights of contour are atHeights of contour are atrelatively same positionrelatively same position

occlusooccluso--gingivallygingivally ± ± Equal amounts of Equal amounts of

undercutundercut

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Altering Path of InsertionAltering Path of InsertionAltering Path of InsertionAltering Path of Insertion

�� Proximal surfaces similarProximal surfaces similarundercutsundercuts

�� R etentive areas similarR etentive areas similarundercutsundercuts

�� Proximal surfaces similarProximal surfaces similarundercutsundercuts

�� R etentive areas similarR etentive areas similarundercutsundercuts

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�� Modify tilt if necessaryModify tilt if necessary

± ± Soft tissue interferencesSoft tissue interferences


± ± Soft tissue interferencesSoft tissue interferences

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± ± EstheticsEsthetics


± ± EstheticsEsthetics

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Once Path SelectedOnce Path SelectedOnce Path SelectedOnce Path Selected

��

Instructor:Instructor: ± ± Approves pathApproves path

± ± Demo:Demo:

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

-- TripodTripod

��

Instructor:Instructor: ± ± Approves pathApproves path

± ± Demo:Demo:

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

-- TripodTripod

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�� Lock cast position & tripodLock cast position & tripod�� Lock cast position & tripodLock cast position & tripod

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TripodingTripodingTripodingTripoding

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Optimal Path of InsertionOptimal Path of InsertionOptimal Path of InsertionOptimal Path of Insertion

�� R etentive undercutsR etentive undercutsequalizedequalized

± ± R etentive arm has aR etentive arm has adifferent path of different path of

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

�� R etentive undercutsR etentive undercutsequalizedequalized

± ± R etentive arm has aR etentive arm has adifferent path of different path of

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

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��

R etentive undercuts equalizedR etentive undercuts equalized ± ± Ideally, retentive arms shouldIdeally, retentive arms should

oppose each other on oppositeoppose each other on oppositesides of the archsides of the arch

��

R etentive undercuts equalizedR etentive undercuts equalized ± ± Ideally, retentive arms shouldIdeally, retentive arms should

oppose each other on oppositeoppose each other on oppositesides of the archsides of the arch

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�� Minimize severe tooth & softMinimize severe tooth & softtissue interferencestissue interferences

�� Minimize severe tooth & softMinimize severe tooth & softtissue interferencestissue interferences

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�� EstheticsEsthetics ± ± Minimize displayMinimize display

of clasps, metalof clasps, metal

componentscomponents

�� EstheticsEsthetics ± ± Minimize displayMinimize display

of clasps, metalof clasps, metal

componentscomponents

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�� Prepare Guiding PlanesPrepare Guiding Planes

± ± Flat surfaces parallel to path of Flat surfaces parallel to path of insertioninsertion

± ± Control & limit movement of Control & limit movement of

R PDR PD

± ± Initial contacts for R PDInitial contacts for R PD

�� Prepare Guiding PlanesPrepare Guiding Planes

± ± Flat surfaces parallel to path of Flat surfaces parallel to path of insertioninsertion

± ± Control & limit movement of Control & limit movement of

R PDR PD

± ± Initial contacts for R PDInitial contacts for R PD

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Guiding PlanesGuiding PlanesGuiding PlanesGuiding Planes

��

StabilizationStabilization��

StabilizationStabilization

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Effectiveness of GuideplanesEffectiveness of GuideplanesEffectiveness of GuideplanesEffectiveness of Guideplanes

�� Most effective when:Most effective when:

± ± Parallel to each otherParallel to each other

± ± More than one common axialMore than one common axialsurfacesurface


± ± Parallel to each otherParallel to each other

± ± More than one common axialMore than one common axialsurfacesurface

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Effectiveness of GuideplanesEffectiveness of GuideplanesEffectiveness of GuideplanesEffectiveness of Guideplanes


± ± Directly opposing each otherDirectly opposing each other


± ± Directly opposing each otherDirectly opposing each other

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Assessing Guiding PlanesAssessing Guiding PlanesAssessing Guiding PlanesAssessing Guiding Planes

ProximalViewProximalView

Facial

View

Facial

View

Carbon

Markings

Carbon

MarkingsIdeal Ideal Acceptable Acceptable Too

Divergent

TooDivergent

Too

Short

TooShort Ideal Ideal Acceptable Acceptable Too

Divergent

TooDivergent

Too

Short


Divergent

TooDivergent

Too

Short


Divergent

TooDivergent

Too

Short


Divergent

TooDivergent

Too

Short


Divergent

TooDivergent

Too

Short


Divergent

TooDivergent

Too

Short

TooShort

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Preparing Guiding PlanesPreparing Guiding PlanesPreparing Guiding PlanesPreparing Guiding Planes

��

Select path of insertionSelect path of insertion�� Design Partial DentureDesign Partial Denture **

�� Select number & position of Select number & position of

guiding planesguiding planes�� Prepare guiding planesPrepare guiding planes

��

Select path of insertionSelect path of insertion�� Design Partial DentureDesign Partial Denture **

�� Select number & position of Select number & position of

guiding planesguiding planes�� Prepare guiding planesPrepare guiding planes

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Use Surveyor to Align BurUse Surveyor to Align Bur

IntraorallyIntraorally

Use Surveyor to Align BurUse Surveyor to Align Bur

IntraorallyIntraorally

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FINGER R EST!FINGER R EST!FINGER R EST!FINGER R EST!

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BursBursBursBurs

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

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

8837K 8837K--0140148837K 8837K--014014

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Guiding Plane DimensionsGuiding Plane DimensionsGuiding Plane DimensionsGuiding Plane Dimensions

Round

xial Line

ngles

Round

xial Line

ngles

Round

xial Line

ngles

Round

xial Line

ngles2-4 mm

1/2-1/3

height

2-4 mm1/2-1/3

height

2-4 mm

1/2-1/3

height

2-4 mm1/2-1/3

height

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Axial Surface Already Parallel toAxial Surface Already Parallel to

Path of InsertionPath of Insertion

Axial Surface Already Parallel toAxial Surface Already Parallel to

Path of InsertionPath of Insertion

�� NO NO PreparationPreparation !!�� NO NO PreparationPreparation !!

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Polish Prepared SurfacesPolish Prepared SurfacesPolish Prepared SurfacesPolish Prepared Surfaces

�� R ubber wheels or pointsR ubber wheels or points�� R ubber wheels or pointsR ubber wheels or points

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Prepare Guiding Planes FirstPrepare Guiding Planes FirstPrepare Guiding Planes FirstPrepare Guiding Planes First

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Effects of Guiding Planes OnEffects of Guiding Planes On

R etention & StabilityR etention & Stability



�� MaintainsMaintainsR etentionR etention

�� MaintainsMaintainsR etentionR etention

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�� Minimizes Need for R etentionMinimizes Need for R etention�� Minimizes Need for R etentionMinimizes Need for R etention

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�� StabilizingStabilizingTeethTeeth

�� StabilizingStabilizingTeethTeeth

U se short guideplanes on Class I & II

U se long guideplanes on Class III & IV

U se short guideplanes on Class I & II U se long guideplanes on Class III & IV U se short guideplanes on Class I & II

U se long guideplanes on Class III & IV

U se short guideplanes on Class I & II U se long guideplanes on Class III & IV

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Other Alterations of Axial Contours




�� Lowering Heights of Lowering Heights of

ContourContour ± ± R igid elements contactingR igid elements contacting

abutmentsabutments

± ±

Improve estheticsImprove esthetics ± ± Prepare guiding planesPrepare guiding planes --

most efficient method tomost efficient method tolowerlower

�� Lowering Heights of Lowering Heights of

ContourContour ± ± R igid elements contactingR igid elements contacting

abutmentsabutments

± ±

Improve estheticsImprove esthetics ± ± Prepare guiding planesPrepare guiding planes --

most efficient method tomost efficient method tolowerlower

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�� R aising Heights of Contour

R aising 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 resin above to createabove to createundercutundercut

�� R aising Heights of Contour

R aising 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 resin above to createabove to createundercutundercut

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PreparingPreparing R etentionR etentionPreparingPreparing R etentionR etention

��

Axial surface must be close toAxial surface must be close toparallel the path of insertionparallel the path of insertion��

Axial surface must be close toAxial surface must be close toparallel the path of insertionparallel the path of insertion

X X X X

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R etentive Preparation ShapeR etentive Preparation ShapeR etentive Preparation ShapeR etentive Preparation Shape

�� Follows the path of designedFollows the path of designed

retentive tipretentive tip

�� Follows the path of designedFollows the path of designed

retentive tipretentive tip

X X X X X X X X

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Creating Undercuts with BondedCreating Undercuts with Bonded

R esinsR esins

Creating Undercuts with BondedCreating Undercuts with Bonded

R esinsR esins

�� Axial surface must be close toAxial surface must be close toparallel the path of insertionparallel the path of insertion

�� Axial surface must be close toAxial surface must be close toparallel the path of insertionparallel the path of insertion

X X X X

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Summary of AbutmentSummary of Abutment

ModificationsModifications

Summary of AbutmentSummary of Abutment

ModificationsModifications

�� After R PD DesignedAfter R PD Designed

± ±

GuideplanesGuideplanes ± ± Lower heights of contour toLower heights of contour to

eliminate interferences &eliminate interferences &improve estheticsimprove esthetics

± ± Create undercuts if absolutelyCreate undercuts if absolutelynecessary (raising heights of necessary (raising heights of contour)contour)

± ± R est seat preparationR est seat preparation

�� After R PD DesignedAfter R PD Designed

± ±

GuideplanesGuideplanes ± ± Lower heights of contour toLower heights of contour to

eliminate interferences &eliminate interferences &improve estheticsimprove esthetics

± ± Create undercuts if absolutelyCreate undercuts if absolutelynecessary (raising heights of necessary (raising heights of contour)contour)

± ± R est seat preparationR est seat preparation

04. surveying 2010

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