Contact Point Contours

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PRESENTED BY:RABIA ALIC-11

BATCH D

CONTACTS & CONTOURS


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Topics to be discussed

Normal physiologic tooth contours

Hazards of faulty reproduction of physioanatomical features of teeth in restoration

Variations in shapes of teeth Procedures for proper formulation of contacts

and contours


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Physiologic toot contours:-

All teeth possess

physiologic contours whichpermit proper stimulation& provide protection fortheir investing &

supporting tissues. Characteristic variations in

the location of generalheight of contours are:

A. In gingival third area ofall ANTERIOR TEETH.


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B. In gingivalthird area ofMAXILLARYPOSTERIORTeeth. Mostprominent onlingual


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C. In GINGIVAL THIRD area most prominent onbuccal surfaces & middle third area on lingual surfacesof mandibular posterior teeth. Most prominent onbuccal.


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Cervical ridge:-If the cervical convexity

of a crown and

the normaltissue relationshipare lost, the height ofconvexity of a restorationmust re-establishthe original physiologicrelationship of the crown

contours to the freegingiva and to the gingivalattachment.


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A. proper relationshipof crown contours

B. Insufficient crowncontour

C. Excessive crowncontour


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Embrasure relationship:-Anterior teeth:-

A

GINGIVAL EMBRASURE

INCISAL EMBRASURE

LABIAL EMBRASURE

LINGUAL EMBRASURE

A.Gingivalembrasures widerand deeper than

incisalembrasures.

B. Lingualembrasures widerand deeper thanlabial embrasures


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Posterior teeth:-

C. Gingivalembrasures widerand deeper than

occlusalembrasures.

D. lingualembrasures wider

and deeper thanbuccal embrasures

GINGIVAL EMBRASURE

BUCCAL EMBRASURE

LINGUAL EMBRASURE


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Marginal ridge relationship:-

Correct incorrect

Essential for:-Balance of teeth in archPrevention of foodimpaction proximallyProtection of

periodontiumPrevention of recurrent& contact decayHelping in efficientmastication


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Contact areas:-

AA

Contact relationships ofposterior teeth.A. Point or marble-like contactareas present at time oferuption.

B. Broad flat contact arearesulting from excessive wear.

C. Typical contact areasresulting from the usual amountof wearobserved in a patient of middleage.

t


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anter or:-

CENTRAL CENTRAL LATERAL

Contact and embrasure relationshipsof maxillary central incisors -labial view.


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LATERAL CUSPID FIRST BICUSPID

Contact and embrasure relationship of lateralincisors and cuspids -

labial view.


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Cuspids & first bicuspid:-

Contact and embrasure relationships ofmaxillary cuspids and firstbicuspid teeth - buccal view.


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Incisal view


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Contact and embrasure relationships of maxillary cuspidsandmaxillary posterior teeth - occlusal view.


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molar teeth:-

FIRST SECOND FIRST MOLARBICUSPID BICUSPID

Contact and embrasure relationships of thefirst and second bicuspids

and first molar teeth - buccal view.

occlusal view

Fi t d & thi d l t th


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First, second & third molar teeth:

FIRST MOLAR SECOND MOLAR THIRD MOLAR

Contact and embrasure relationships between the first,second, andthird molar teeth - buccal view.

occlusal view.

t t :


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an u ar teet :Incisors & cuspids:

Contact and embrasure relationships between the

mandibular incisorsand cuspid teeth - incisal view

CENTRAL CENTRAL , LATERAL CUSPIDlabial view.

C id & fi bi id


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Cuspid & first bicuspid:-

LATERAL CUSPID BICUSPID BlCUSPlD

Contact and embrasure relationshipsbetween the mandibular cuspids

and first bicuspid teeth - buccal view.

occlusal view.


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molar teeth:

FIRST SECOND FIRST MOLAR

BlCUSPlD BICUSPID

Contact and embrasure relotionshipsbetween mandibular first andsecond bicuspids and first molar teeth

- buccal view.

occlusal view.

st s t t t


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rst, secon t r mo ar teet

Contact & embrasure relationships between mandibular firstsecond and third molar teeth - buccal view.

Second

bicuspidFirst molar

Second

molar

Third

molar

Occlusal view


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-teeth in restorations:-

A. Contact size:- Broad contact

Narrow contact

Contact too occlusally


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A. Too bucally

B. Lingually

C. Gingivally


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Loose (open) contact


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Contact configuration:-


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C. Contour:-

Faial and lingual convexities

Facial and lingual concavities

Areas of proximal contour adjacent to contactarea


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Facial and lingual convexities


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Facial & lingual concavities


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adjacent to contact area


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c. Marginal ridges:- a. Absence of a marginal ridge in the

restoration.


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b. a marginal ridge with an exaggerated occlusalembrasure:-


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c. Adjacent marginal ridges not compatible inheight:-

d A marginal ridge with no adjacent triangular


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d. A marginal ridge with no adjacent triangularfossa

e A marginal ridge with no occlusal embrasure:-


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e. A marginal ridge with no occlusal embrasure:-

f A one-planed marginal ridge in the


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f. A one-planed marginal ridge in thebuccolingual direction:-

g A thin marginal ridge in its mesio distal bulk:-


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g. A thin marginal ridge in its mesio distal bulk:

h Marginal ridge not compatible in dimension or


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h. Marginal ridge not compatible in dimension orlocation with the rest of the occluding surfacecomponents:-


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Variations in shapes of teeth:-Tapering

Square/box

Ovoid/barrel


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y


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contact tapering square Ovoid

1.Between

incisors

Contact starts atthe incisal ridgeincisaly & a littletowards the labial,labio-lingualy

Start at incisalridge incisally & inline with it labio-lingually

1.Slightly lingualto incisal ridgelabio-lingually

2.Mesial contactsstart at of thecrownincisogingivally.

3.Distal contacts

start 1/3 to ofthe crown inciso-gingivally


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2.canine 1.Mesal contact atincisal ridge

2.Distal contactnear the middle

3.Very angular

1.Close to incisalridges incisally

2.In line withthem labio-

lingually

The same assquare type

3.bicuspids1.Buccal periphery almostat buccal axial angle(buccal3rd) of tooth.

2.Occlusal periphery at

junction of occlusal &middle 3rd.

3.Contact deviated bucally

4.Cusps form -1/3 ofcrown

1.Buccal peripherymore towardsbuccal axial angle

2.Occlusalperiphery atocclusal 3rd.

3.Short cusps.

Convexity of MR carriesocclsal periphery towardsmiddle 3rd.2.buccalperiphery at junction of

buccal and middle third.

contacttapering

squareovoid


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contact tapering. Square Ovoid

4.Molarsmesialcontact

1.Buccal periphery almostat the buccal axial angle oftooth.

2.o-periphery at junction ofocclusal and middle third ofcrown

3.Large cusps

1.The same as premolar

2.Extention lingually stopsin middle 3rd.

Same as bicuspids.

5.Molarsdistal contact

1.B-periphery at middle 3rd

.2.O-periphery at middlethird

3.Distal contact of 1st molaris variable due to positionof distal cusps

More lingually deviatedthan the mesial but to theextent of tapering teeth.

B-periphery in line withcentral groove in o-surface.


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contact tapering Square Ovoid

embrasures1.Wide variations

2.Incisal and labial are

negligible3.Gingival and lingualbetween anterior teeth arewidest and longest inmouth

4.buccal are small

5.Lingual are long, withmedium width.

6.Gingival betweenposterior teeth are broadand long

1.incisal,lingual,occlusaland buccal embrasures arenil

2.Gingival almost notnoticeable; if found,v.narrow and flat.

3.Lingual are v.narrow(may be slit) and long.

1.incisal,labial,buccal andocclusal are wider anddeeper than the others

2.Gingival and lingual areshort and broad.

PROCEDURE FOR FORMULATION OF


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PROCEDURE FOR FORMULATION OFPROPER CONTACTS AND CONTOURS

Intra oral procedures

Extra oral procedures


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Intra oral procedures:-

1. Tooth movement

2. Matricing


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Tooth movement:-

The act of either separating the involved teethfrom each other, bringing them closer to eachother, and/or changing their spatial position inone or more dimensions.


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OBJECTIVES:-

To bring drifted tilted or rotated teeth totheir indicated physiological position for properreproduction of proximal surfaces inrestorative materials.

To close space between teeth not amenable toclosure by the contemplated restoration. To move teeth to a position most physiologically

acceptable by periodontium.

Extrusion or intrusion of teeth making themrestorable.

Moving teeth from a nonfunctional or


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Moving teeth from a nonfunctional ortraumatically functional position to aphysiologically functional one.

Moving teeth to an aesthetically pleasingposition To increase dimensions of available tooth

structure for resistance and retention formsof restoration.

Creating sufficient space for matrix bandinterproximaly

Easy access to proximal surface for cavitypreparation

Detection of proximal caries Facilitate polishing of restorations proximal

surface Remove foreign bodies impacted proximally


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Methods of tooth movement

Rapid or immediate

Slow or delayed

ap or mme ate


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ap or mme ate

Mechanical type ofseparation thatcreates eitherproximal separation

at the point ofseparatorsintroduction and/orimproved closeness

of proximal surfaceopposite the pointof separatorsintroduction


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Indications:-

Preparatory to slow tooth movement Maintain space gained by slow tooth movement

Methods:-1.Wedge method2.Traction method


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Wedge method:-

Separation accomplished by insertion of apointed wedge shaped device between the teeth, in

order to create separation at that point orclosure on the opposite proximal side of involved

teeth.a. Elliot Separator

b. Wooden or plastic wedges


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Functions of wedges

Assure close adaptibility of the matrix and to the tooth


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Occupy the space designated to be the gingivalembrasure

Define gingival extent of contact area, facial &lingual embrasures

Create space to compensate matrix band Temporary hemostasis Immobilization of matrix band

Protect interproximal gingiva from unexpectedtrauma
http://www.dentaljuce.com/fruit/images/wedges/LargestAfter.jpghttp://www.dentaljuce.com/fruit/images/wedges/LargestBefore.jpg


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consequences of poor wedge technique
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consequences of poor wedge techniqueAmalgam condensation requires high packingforces if it is going to be adequate. These

forces will always push amalgam beyond thematrix unless it is wedged, causing overhangs.Overhangs will often result in periodontaldisease(+ bone loss),and caries.

Accidents can happen both when a practitioner


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pp pis inexperienced, and when (over-) confident oftheir skills.

The wedge in this radiograph had encroachedtowards the contact area, leaving a poorcontour. This results in food packing and plaqueaccumulation.

Wooden wedges


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Wooden wedges

Resin wedges.

C. Nail of thumb or first finger:-

For instantaneous use e.g planning the axial wall,forming line angles, polishing of class III

restoration


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Traction method:-

mechanical devices, engage inproximal surfaces of teeth tobe separated by means ofholding arms.

a. Non-interfering trueseparator:-

Provides continuous stabilized

separation during operationSeparation can be increased or

decreased

B F i


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B. Ferrierdouble bowseparator:-

Separationstabilizedthroughout

operation Separation

shared bycontactingteeth & not atthe expense ofone tooth

Sl d l d t th t


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Slow or delayed tooth movement

Over a period of weeks will allow properrepositioning of teeth in a physiologic manner

Methods:-

separating wires Over sized temporaries

Orthodontic appliances


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Contact Point Contours

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