A Predictive Model for the Clinical Marginal Fracture of Amalgam

Mahler, David B.; Marantz, Richard L.; Engle, J.H.

doi:10.1177/00220345800590081101

Cited by 47 publications

(14 citation statements)

References 12 publications

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“…In a study of the clinical behavior of 14 dental amalgams, which included both low-and high-copper alloys, the property of creep was shown to be a significant factor in predicting clinical performance (Mahler et al, 1980). Although a causeeffect relationship has not been established, creep can still be considered a most important mechanical property characterizing amalgam.…”

Section: Introductionmentioning

confidence: 99%

Effect of Time at 37°C on the Creep and Metallurgical Characteristics of Amalgam

1987

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When aged at 37 degrees C for six months, dental amalgam exhibits a marked decrease in the property of creep. The objective of this study was to investigate the relationship between this decrease in creep and selected metallurgical characteristics. The formation of beta 1 (Ag-Hg), the grain size of gamma 1 (Ag-Hg), and the composition of gamma 1 were chosen for investigation. Creep was determined according to ADA Specification test No. 1, beta 1 was measured by x-ray diffraction, and gamma 1 grain size and gamma 1 composition were determined by electron-probe microanalysis. The results showed that the decrease in creep was related to beta 1 formation and not to changes in either gamma 1 grain size or gamma 1 composition.

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Section: Introductionmentioning

confidence: 99%

Effect of Time at 37°C on the Creep and Metallurgical Characteristics of Amalgam

1987

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“…[10][11][12] Previous reports have shown that the improved clinical performance of amalgam restorations, as measured by a reduction in marginal fracture, is also related to the presence of zinc in the amalgam alloy. [32][33][34][35] The presence and location of zinc at the margins of the 16-year old clinical amalgam restoration shown in Figure 7 could be related to this improved clinical performance. Thus, there appears to be multiple benefits from the presence of zinc in amalgam alloys.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Sealing of Amalgam Restorations In Vitro

Mahler¹,

Pham²,

Adey³

2009

Operative Dentistry

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©Operative Dentistry, 2009, 34-3, 312-320 DB Mahler • BV Pham • JD Adey Clinical RelevanceAfter placement, amalgam restorations exhibit a gap between the restoration and tooth structure, which fills with corrosion products during time in clinical service. To reduce the time necessary to fill this gap, an amalgam that exhibits a small initial gap shortly after setting and an amalgam that contains zinc is recommended. SUMMARYAmalgam restorations, when first placed, have been shown to exhibit a gap at the amalgam/tooth interface. With time in service, this gap fills with corrosion products that have the potential to "seal" the restoration. With the advent of high-copper, more corrosion-resistant amalgams, there has been concern that the time required to create this seal would be increased significantly when compared with low-copper traditional amalgams. The current study was designed to address this concern. Amalgam was condensed into a MACOR mold, simulating a Class I cavity form and then immersed into a 1.0% NaCl solution to simulate oral conditions. Using an air pressure test, the sealing was monitored over time. The results showed that the sealing was influenced by the size of the initial gap prior to immersion as well as corrosion resistance of the amalgam and that a corrosion-resistant amalgam with a small initial gap size can seal as quickly as a corrosion-prone amalgam. Therefore, it is not possible to predict sealing behavior based on corrosion resistance, alone. Furthermore, the presence of zinc in the amalgam alloy has been shown to result in the formation of zinc corrosion products in the amalgam/mold margin, which contributes to more rapid sealing. Analysis of a tooth extracted after 16 years of clinical service that had been restored with an amalgam-containing zinc was also shown to contain zinc corrosion products in the occlusal marginal area. This could explain the reported reduction in marginal fracture of clinically placed amalgam restorations made from zinccontaining alloys.

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“…This amalgam powder has been called a ''high-copper admixed" powder. Mahler and his colleagues [2] reported that restorations using this high-copper admixed amalgam demonstrated less marginal fracture. The representative highcopper admixed alloy powder (Dispersalloy; L.D.…”

Section: Introductionmentioning

confidence: 96%