Clinical behaviour over three years of GS-80 and Lojic+ amalgam alloys

The clinical performance of GS-80 and Lojic+amalgam alloys was compared with that of Dispersalloy, Valiant PhD, Lojic N and Permite C amalgam alloys over periods of up to three years. The 1114 restorations were placed by one dentist in 23 canine, 418 premolar and 673 molar permanent teeth of 301 adult patients treated in a private practice. Direct and indirect clinical assessments were made of the restorations for failures (there were no true failures), and for the deterioration of four clinical factors. All restorations were rated as being either 'good' (A) or 'adequate' (B) for each of the four factors which, apart from surface texture, showed some slight but statistically-significant clinical deterioration with time. Lojic+ and Permite C showed clinically slight but statistically more surface roughness and marginal fracture, while Lojic+ and GS-80 showed more surface tarnishing, than did the other alloys. There were no statistically significant differences between the alloys for marginal staining.