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7b Stainless Steel Crown
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STAINLESS STEEL STAINLESS STEEL CROWNSCROWNS
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INDICATIONSINDICATIONS1. Extensive Decay: 3 / more surfaces.2. Following Pulp Therapy: Brittle/ Loss of tooth
structure3. Preventive restoration: Avoids amalgam # prevents caries Handicapped Plaque easily visualized4. Hypoplastic defects
5. Abutment for space maintainers
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CLASSIFICATIONCLASSIFICATION
1. MANUFACTURER: Unitek/3M/ Rocky Mountain
2. COMPOSITION: 18:8 Stainless Steel/ Ni-Cr
3.UNTRIMMED / PRETRIMMED /PRECONTOURED
4.Anterior/Posterior
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CompositionComposition
STAINLESS STEEL CROWNS
•AUSTENITIC / MARTENSITIC /FERRITIC
•AUSTENITIC: High Ductility/ Yield Strength/ Ultimate Tensile Strength/ Corrosion Resistance./ Work Hardened
•18% Cr, 8% Ni, C- 0.05%- 0.15%, Fe- 70%
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Ni-Cr CROWNS
•Ni-72%,Cr-16%,Fe-10%, C/ Mn /Si- 2%.
•Easy to fit, Least amount of trimming, crimping, contouring.
•Strain Hardened during the manufacture.
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EQUIPMENTEQUIPMENT
1.BURS: Flame shaped bur,1/2 round bur, 4/6 round bur, Green Stone
2 Pliers: Johnson No 114 Gordon No 137 N0 417 Abell ball & socket Crown & Bridge Scissors
3.Rubber dam,Wedges, Glass slab & CEMENT
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PROCEDUREPROCEDURE
CROWN SELECTIONCROWN SELECTION: Fit smallest crown : Fit smallest crown possiblepossible
Pre-op: matching the MD widthPre-op: matching the MD width
Trial & Error Trial & Error
Evaluate Evaluate : occlusion, dental midline, cusp : occlusion, dental midline, cusp fossa relationship, primate spaces.fossa relationship, primate spaces.
LA, Rubberdam ,WedgingLA, Rubberdam ,Wedging
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TOOTH PREPARATIONTOOTH PREPARATION
Occlusal ReductionOcclusal Reduction : 1.5-2 mm, remove : 1.5-2 mm, remove caries.caries.
Proximal reductionProximal reduction: Contacts : Contacts broken,slight occlusal convergence. broken,slight occlusal convergence. Feather edge finish lineFeather edge finish line
Buccal & Li reductionBuccal & Li reduction : Minimal reduction, : Minimal reduction, Bu/Li cervical bulge can be left uncutBu/Li cervical bulge can be left uncut
Finishing:Finishing: All line angles rounded All line angles rounded Evaluate Evaluate PreparationPreparation
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PROXIMAL REDUCTION
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BUCCAL & LINGUAL BUCCAL & LINGUAL REDUCTIONREDUCTION
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CROWN SEATED
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TRIAL FITTING,TRIMMING & CONTOURINGTRIAL FITTING,TRIMMING & CONTOURING
Aim:Aim: leave margins in gingival sulcus leave margins in gingival sulcus (1mm) & reproduce crown morphology(1mm) & reproduce crown morphology
Seating crownSeating crown::Gingival marginGingival margin: marked & trimmed with : marked & trimmed with
scissorsscissorsContoured & CrimpedContoured & CrimpedFinal smoothening & PolishingFinal smoothening & Polishing: heatless : heatless
stone, rubber wheel.stone, rubber wheel.Evaluate adaptation of crownEvaluate adaptation of crown
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Evaluation of initial adaptationEvaluation of initial adaptation
SnapSnap into place into placeSnugly fit against preparationSnugly fit against preparationMargins extend 1mm below gingivaMargins extend 1mm below gingivaNo blanchingNo blanchingRestore occlusionRestore occlusion
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CementationCementation
Post cementation instructionsPost cementation instructions
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PRINCIPLES FOR OBTAINING OPTIMAL ADAPTATION
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ADAPTING OVERSIZED CROWN
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ADAPTING SMALLER CROWN
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TEETH WITH SUBGINGIVAL CARIES
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Placement of adjacent crownsPlacement of adjacent crowns
• Occlusal reduction of one crown Occlusal reduction of one crown completelycompletely
• Proper proximal reductionProper proximal reduction• Both crowns trimmed, contoured & Both crowns trimmed, contoured &
prepared for cementation simultaneouslyprepared for cementation simultaneously• Placement & Cementation of most distal Placement & Cementation of most distal
tooth first.tooth first.
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SSC & CL2 AFSSC & CL2 AF
Do tooth preparation & Cl2 cavity Do tooth preparation & Cl2 cavity preparation.preparation.
Cement crownCement crownAdapt wedge & matrix & insert amalgamAdapt wedge & matrix & insert amalgam
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SSC in Space LossSSC in Space Loss
Tooth preparation for smaller crownsTooth preparation for smaller crownsUsually crowns will fit individually but Usually crowns will fit individually but
not at the same timenot at the same timeBy experimentation select the optimum By experimentation select the optimum
combination of crownscombination of crownsFlatten contacts with Howe plierFlatten contacts with Howe plierAlign the marginal ridges properly using Align the marginal ridges properly using
Howe plierHowe plier
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Complications