A comparative evaluation of the microhardness, water solubility and water absorption of fissure sealants

Williams, Brian; Fraunhofer, J.A. von; Winter, G B

doi:10.1016/0300-5712(75)90016-0

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…The results reported here have confirmed the findings of Williams, Fraunhofer & Winter (1975) and Watkins (1975) that sealants continue to increase in hardness long after their initial setting. Nuva-seal, Alphaseal, Epoxylite 9075 and Concise Enamel Bond tended towards similar values in the range 10-20 kg/mm^ during the threemonth test period.…”

Section: Discussionsupporting

confidence: 90%

“…Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

Section: Methodsmentioning

confidence: 99%

“…A primary load of 0-001 kg was applied, and the increase in surface penetration by a standard Vickers diamond indentor, on adding a further load of 0-3 kg for 30 s, was measured to a precision of 0-25 ftm. Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

Section: Methodsmentioning

confidence: 99%

“…intensity applied, the wide variation found in the u.v. output of Nuva-lites could be a factor contributing to the variable retention found in different clinical trials (Young et al, 1977). The present study further examines the setting behaviour of these materials by considering the microhardness of three chemically setting, and two u.v.…”

Section: Introductionmentioning

confidence: 91%

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Microhardness studies on the setting characteristics of fissure sealants

Young

Cummings

Main

et al. 1978

J of Oral Rehabilitation

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The hardness of five fissure sealants was measured using a Wallace Microhardness Tester and found to continue to increase long after the initial setting. The effect of the intensity of radiation and exposure time on the setting of two u.v. activated sealants (Nuva-seal and Alphaseal) was also investigated, with higher intensities producing both a more rapid set and greater final hardness. Alphaseal required longer exposure at a given intensity of u.v. radiation to achieve the same hardness as Nuva-seal, and displayed relatively slow setting in depth, which could give rise to incomplete polymerization during clinical use, resulting in early sealant loss. Thus special care must be taken to ensure that Alphaseal receives an adequate exposure to u.v. radiation, and sources which are suitable for setting Nuva-seal may not be sufficiently powerful when applying Alphaseal.

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Section: Discussionsupporting

confidence: 90%

“…Ten such indentation measurements were made and the mean value used in the following formula to calculate the Woxen Hardness Number (Woxen, 1944).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

See 2 more Smart Citations