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16 Cards in this Set
- Front
- Back
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What should you check before a Class II procedure?
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clinical & radiographic examination
thorough diagnosis substantial tooth structure remain to bear occ load patient factor & consent LA & rubber dam |
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What is the clinical & radiographic evidence for a Class II?
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caries lesion on occ. & prox. surface
minimal sound enamel between occ. & prox. lesion lateral spread on DEJ = code 4+ |
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Pulpal depth of Class II prep.
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2.5mm
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OG depth of Class II prep.
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3.5-4.0mm
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Axial depth of Class II prep.
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1.0-1.5mm
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How far should the cavity prep penetrate the dentine?
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0.1-0.2 mm
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How is good Retention form achieved?
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dovetail, occ. lock
isthmus should be < 3rd of intercuspal distance isthmus should not coincide w/ axiopulpal line angle diverge gingivally at proximal clears gingival margin of adjacent tooth |
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How is good Resistance for achieved?
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flat & perpendicular gingival & pulpal floor
slightly rounded internal angles (incl. axio-pulpal line angle) |
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How do you line a Class II prep?
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1. dentine cond.
2. Fuji bond LC (or GIC) 3. wait 3mins for set before restoring |
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What is the purpose of the Matrix band & wedge?
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proximal contour & contact point
metal band: firm wall for adequate cond. of amalgam minimise overhang (could lead to early perio. dis.) Note: universal matrix is the 'tofflemire' |
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What is a closed or open sandwich?
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Closed: No exposed GI (lining)
Open: layer of GI then layer of CR |
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What is the rationale for the sandwich technique?
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modulus of elasticity comparable to dentine
F release prevent secondary caries marginal integrity for better adaptation reduce setting stress (chem. cure GI less shrinkage) GIC micromechanically bond to composite decrease config. value, reduce polym-shrink of CR |
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What should be noted when using the open sandwich technique?
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margin between GIC and resin is under contact point?
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How many increments are usually used for this restoration?
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5
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Which particle is harder? Polishing or filler?
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polishing particles harder otherwise polishing agend would only remove soft resin matrix leaving gritty surface of protruding filler particle.
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What substance is used on polishing strips?
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Coating of aluminium oxide abrasive (with polyester backing)
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