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The effect of time on the marginal fracture behaviour of amalgam
Author(s) -
MAHLER DAVID B.,
MARANTZ RICHARD L.
Publication year - 1979
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1979.tb00420.x
Subject(s) - amalgam (chemistry) , fracture (geology) , mathematics , ranking (information retrieval) , statistics , scale (ratio) , set (abstract data type) , dentistry , orthodontics , materials science , computer science , medicine , composite material , chemistry , artificial intelligence , physics , electrode , quantum mechanics , programming language
Summary In this study the effect of time on the marginal fracture behaviour of amalgam was determined. Six alloys in clinical service for up to 6 years were used as a data base and occlusal photographs were categorized according to a standard set of photographs depicting varying degrees of marginal fracture. The standard set of photographs was assigned a linear numerical scale, and the index of extent of fracture was considered to be an arithmetic mean based on this linear scale. An observed patient effect and unequal sample sizes were considered in the determination of both the mean and variance. The results of applying these procedures to the data of this study showed that marginal fracture increased with time for all alloys; that the relative ranking of alloys did not change with time; and that, with certain limitations, early time evaluations can predict long‐term behaviour.