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16 Cards in this Set
- Front
- Back
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What are the issues with extensive restorations?
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-pulp protection
-retention and resistance -restorative technique (direct/indirect) |
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What happens to pulp if remaining dentin is less than 1mm?
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-odontoblast viability decreases
-pulpal inflammation increases |
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What limits retention occlusally and laterally?
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lack of opposing walls
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What are some retention considerations?
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pins and posts
-extended outline- dovetail -extended internal form |
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What are the cons to pins and posts?
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-tend to weaken tooth and restorative material
-more for flat 1 surface cavity -placed near line angle -.5-1mm from DEJ, parallel to external surface |
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What are some extended internal form considerations?
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-vertical grooves in opposing walls
-coves -slots -amalgapin |
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What are the parameters of an amalgapin?
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1-2mm deep channel prepared in dentine
1mm wide, bevelled orifice |
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What are the resistance considerations?
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-weakend unsupported cusps
-cusp overlay, material thickness, positioning of margins |
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Direct Vs. indirect
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What are some examples of indirect restorations?
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-inlay, onlay
-crown |
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How do you do a stainless steel crown for decid tooth?
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-caries removal
-occlusal reduction- 1-1.5mm with high speed bur -proximal reduction- high speed bur, break contact on gingival, buccal and lingual -explorer should be able to pass through entire contact -buccal and lingual reduction -round line angles, round occlusal 1/3 of buccal/lingual surfaces, cervical buldge retention |
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what do you do is SSC is too long?
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trim with scissors following contour of gingival margin, smooth margins with stone or wheel
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How do you seat SSC?
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-seat buccal to lingual, slide crown over buccal cervical buldge
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Why might the SSC not seat well?
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-proximal contacts not broken
-gingival ledge -inadequate occlusal reduction -SSC too long |
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What do you cement on with?
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GIC, 1/2 to 2/3 fill crown
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once cemented what do you check?
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-marginal ridge heights match adjacent teeth
-proximal contact restored -margins closely adapted, extend into sulcus may blanch -remove all cement left over |
