title: Clinical evaluation of high-copper dental amalgams with and without admixed indium.
abstract: High-copper amalgam alloys containing 5% and 10% admixed indium, shown in previous studies to have improved properties and acceptable biological behavior, were evaluated in a clinical study designed to examine factors relating to clinical success. One hundred and seventy-five Class I and Class II amalgam restorations were placed in 25 patients. Each patient received all three dispersed-phase amalgams tested: without indium (Dispersalloy), with 5% indium (Indisperse 5), with 10% indium (Indisperse 10). After 30 months, 22 patients were recalled and 146 restorations evaluated. The margins of the indium-containing amalgam restorations incurred slightly less marginal breakdown, an effect that could be attributed to the addition of admixed indium and to the increase in silver-copper eutectic spheres which is found in these alloys. These amalgams also demonstrated a slightly darker appearance, and were slightly rougher than the non-indium-containing amalgam. These differences were minor; at 30 months, all restorations were well within the clinically acceptable range for each parameter evaluated.
authors.affiliation: Department of Restorative Dentistry, University of Washington, Seattle.
authors.forename: G H
authors.initials: GH
authors.lastname: Johnson
authors.forename: D J
authors.initials: DJ
authors.lastname: Bales
authors.forename: L V
authors.initials: LV
authors.lastname: Powell
mesh_terms: D000704:Analysis of Variance; D003300:Copper; D003722:Dental Alloys; D003723:Dental Amalgam / Q000737:chemistry*; D003763:Dental Leakage / Q000517:prevention & control*; D006801:Humans; D007204:Indium; D008422:Materials Testing
chemical_list: D003722:Dental Alloys; D007204:Indium; C076832:Indisperse; C033470:Dispersalloy; D003300:Copper; D003723:Dental Amalgam