16: Base metal alloys

16

Base metal alloys


Box 16.1 Characteristics of titanium and titanium alloys
Benign biological response
High corrosion resistance
Rapid repassivation (10−9 seconds)
Low density (4.5 g/cm3)
Low elastic modulus (100 GPa)
High strength (240–550 MPa)

Table 16.1 Dental applications of base metal alloys

Cast metals Wrought metals
Nickel–chromium Partial denture frameworks
Crowns and bridges
Metal–ceramic restorations
Cobalt–chromium Partial denture frameworks
Cobalt–chromium–nickel Orthodontic wires
Stainless steel Orthodontic wires and brackets
Endodontic instruments
Titanium and Ti alloys Crowns and bridges Implants
Partial dentures Crowns and bridges
Implants Orthodontic wires
Nickel–titanium Orthodontic wires

Table 16.2 Compositions of cobalt–chromium and nickel–chromium casting alloys

Cobalt–chromium Nickel–chromium
Chromium ≥25%* ≥ 20%*
Molybdenum ≥4% ≥ 4%
Beryllium Trace ≤ 2%
Cobalt Main constituent
Nickel 0–30% Main constituent

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Jan 1, 2015 | Posted by in Dental Materials | Comments Off on 16: Base metal alloys
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