Marginal Fracture of Amalgam Restorations

Mahler, David B.; Terkla, Louis G.; Eysden, Jan Van

doi:10.1177/00220345730520042901

Cited by 105 publications

(27 citation statements)

References 3 publications

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“…Although previous studies have shown an operator effect (Letzel et al, 1977;Osborne & Gale, 1974), an evaluation of the present data revealed no difference between the two operators. * In a previous study (Mahler, Terkla & Van Eysden, 1973), ridit means were used to infer extent of fracture. Although the stated differences among alloys in that study are valid, the inference that ridit means are invariant measures of marginal fracture is now viewed as inappropriate; rather, their interpretation is probabilistic in nature.…”

Section: Materials Aud Methodsmentioning

confidence: 99%

The effect of time on the marginal fracture behaviour of amalgam

Mahler

Marantz

1979

J of Oral Rehabilitation

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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 size 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.

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Section: Materials Aud Methodsmentioning

confidence: 99%

The effect of time on the marginal fracture behaviour of amalgam

Mahler

Marantz

1979

J of Oral Rehabilitation

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“…The rheological property of 'static creep' has been closely associated with the rate of marginal breakdown, although recent work suggests that the correlation for some low 'creep' systems may not be as strong as originally proposed (Osborne et al, 1978). Elimination of the tin-mercury (gammatwo) phase, reduction in creep and increased corrosion resistance may all add to the life of the amalgam restorations (Binon et al, 1973;Mahler et al, 1973Mahler et al, , 1975Osborne et al, 1976;Sarkar, 1978), although definitive cause and effect relationships are still lacking.…”

Section: Introductionmentioning

confidence: 99%

“…An indirect technique making use of standardized photographs and a ridit analysis was described by Mahler et al (1973). He has further developed this technique (Mahler & Marantz, 1979) making it possible to classify the amalgam restorations into eleven different categories.…”

Section: Introductionmentioning

confidence: 99%

Clinical evaluation of high copper amalgam restorations

Rydinge

Goldberg

Sánchez

et al. 1981

J of Oral Rehabilitation

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A comprehensive clinical investigation of amalgam restorations was undertaken to evaluate the performance of "high copper' amalgams and the methods used to examine the marginal integrity of restorations. Six alloys, Aristaloy CR (A), Dispersalloy (D), Indiloy (I), an experimental "high copper' amalgam (E), Tytin (T), and New True Dentalloy (N) as a control, were randomly placed by four operators in 435 Class 1 and Class II restorations. Black and white 1 x photographs were taken at baseline, 6, 12 and 18 months and evaluated using the method described by Mahler & Marantz (1979). In addition, the U.S. Public Health Service system (Cvar & Ryge, 1971) was used at each recall. An analysis of variance based on photographic scoring indicated significant differences (P less than 0.05) among alloys at each recall. The use of Duncan's multiple range test resulted in two homogeneous subsets at 18 months: D, I, E and T, N, A. Six and 12 months recall data showed a close similarity in the rank order of the six alloys. The U.S.P.H.S. system showed no statistically significant differences between the alloys using the chi-square test, however, at each recall the rank order was comparable to that obtained with the photographic method.

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“…In addition, most manufacturers claim a value for creep significantly lower than that of previous compositions. Some manufacturers frequently refer to this property since it is predictive, to some extent, of the long-range clinical performance of a given amalgam (Mahler, Terkla & Van Eysden, 1973).…”

Section: Introductionmentioning

confidence: 99%

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1980

Operative Dentistry

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Marginal Fracture of Amalgam Restorations

Abstract: Marginal fracture characteristics of clinical restorations made from three amalgam alloys were evaluated during a four-year period. Marginal fracture increased with age; the rate of increase was different among alloys, and the ranking of alloys remained the same during the four years.

Cited by 105 publications

References 3 publications

The effect of time on the marginal fracture behaviour of amalgam

The effect of time on the marginal fracture behaviour of amalgam

Clinical evaluation of high copper amalgam restorations

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