Materials for Inlays, Onlays, Crowns and Bridges
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Transcript of Materials for Inlays, Onlays, Crowns and Bridges
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Inlay – indirect restoration; occlusal surface excluding cusps
Onlay – indirect restoration; occlusal surface plus cusp(s)
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Crown – usually covers the clinical crown of the natural tooth Can create “¾ crowns”
Bridge – replaces missing tooth/teeth Abutment vs. Pontic Cantilever, Maryland
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Cantilever Bridge
Maryland Bridge
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Dental Ceramics – Porcelains Composites Metals
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Crowns (Anterior – “jackets”) Veneers Fused to metal for crowns & bridges Denture teeth Inlays & Onlays All-porcelain crowns & bridges (without metal
substructure)
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Intended for very large Class I or II restorations Applied directly or indirectly Reduces concern of polymerization shrinkage and
marginal leakage Composite restoration fully cured outside of mouth Similar to direct composite materials
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The tooth is prepared The prep-site is lined with a lubricant The composite is placed and cured (but
not etched, bonded!) Remove the composite filling and finish
cure The restoration is cemented into prep at
same appointment
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After tooth is prepped, an impression is taken A provisional filling material is placed The impression is sent to lab Lab fabricates the restoration from composite material
onto the die The restoration is cured fully The inlay is seated with composite cement at 2nd
appointment
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Full metallic crowns, bridges Inlays, onlays Substructure for PFM’s Substructure/framework for partial dentures Temporary crowns (prefabricated)
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Alloys have advantages over pure metals alone: Stronger Harder Easier to fabricate Less expensive
Alloys are formed when metallic atoms are dissolved within the atoms and crystals of another metal
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Gold is a soft metal Less gold in alloy improves
strength ADA-approved classes
based on properties of alloy Mixed with platinum,
palladium, copper & silver Gold alloys are expensive
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