Radiopacity of acrylic resins

Álvares, Luiz Casati

doi:10.1016/0030-4220(66)90301-x

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…Otros autores han reportado la dificultad para visualizar las resinas acrílicas en la imagen radiográfica (Alvarez, 1966;Newton et al, 1987;Bloodworth & Render, 1992;Mattie et al). Estudios que evalúan la radiopacidad de las resinas acrílicas son escasos y fueron la mayoría publicados en la década de los no-venta.…”

Section: Discussionunclassified

Radiopacidad de Resinas Acrílicas y Bisacrílicas Usadas como Restauraciones Provisionales

Vega

Osorio

Estay

et al. 2021

Int. J. Odontostomat.

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RESUMEN: Una adecuada radiopacidad de los materiales para restauraciones provisorias permite su evaluación en el examen radiográfico. Sin embargo, existe gran desconocimiento sobre el cumplimiento de los requerimientos establecidos por la norma ISO 4049. El objetivo del siguiente estudio fue determinar la radiopacidad de los materiales para provisionalización presentes en el mercado nacional y corroborar si estos cumplen con el valor mínimo requerido por la normativa. Se realizó un estudio experimental in vitro, en el cual se prepararon muestras en forma de discos de 10 mm de diámetro y 1 mm de espesor de resinas acrílicas: Acrílico Autocurable (Marché®), Duralay (Reliance), Caulkâ (Dentsply), ALIKE™ (GC) y resinas bisacrílicas: Protemp™4 (3M, 2008), LuxatempStar (DMG), Luxacrown (DMG), Structur Premium (VOCO), ExperTemp™ (Ultradent) y Acrytemp (Zhermack). Las muestras fueron radiografiadas junto a una cuña de aluminio escalonada. Las imágenes fueron analizadas para determinar el valor en escala de grises y su respectivo valor en mm de aluminio. Los datos fueron analizados para verificar si cumplen con la normativa ISO. Se encontraron diferencias estadísticamente significativas. La radiopacidad equivalente de las resinas acrílicas en mm de Al en orden descendente fue de 0,85 ± 0,08 para ALIKE™, 0,72 ± 0,32 para acrílico Marché®, 0,65 ± 0,25 para Caulkâ y 0,56 ± 0,05 para Duralay, siendo todos menores a lo requerido por la norma. La radiopacidad equivalente de las resinas bisacrílicas fue de 1,75 ± 0

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Section: Discussionunclassified

Radiopacidad de Resinas Acrílicas y Bisacrílicas Usadas como Restauraciones Provisionales

Vega

Osorio

Estay

et al. 2021

Int. J. Odontostomat.

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“…As a comparative reference close to the radiopacity of dentine, aluminum has been chosen as a standard. 21,25 The absorption coefficient of aluminum is approximately equivalent to that of human den- Figure 1 Optical density of Al step-wedge versus thickness (mm). tine of the same thickness.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The filler content of composites plays an important role in the properties of dental materials. 20,21 The incorporation of heavy metal to provide radiopacity can induce an adverse effect on other essential physical and chemical properties such as hardness 22,23 and polymerization shrinkage. 20,24 Incorporating large percentages of radiopaque fillers can also cause loss of dimensional stability of the composite.…”

Section: Introductionmentioning

confidence: 99%

Radiopacity evaluation of Bis‐GMA/TEGDMA/opaque mineral filler dental composites

Amirouche

Mouzali²,

Watts

2007

J of Applied Polymer Sci

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The purpose of this work was to determine radiopacity values of composites based on (Bis-GMA/ TEGDMA) monomers, at varying monomer compositions: (25/75), (50/50), and (75/25), mixed with five different radiopacifying filler agents: BaO, BaSO 4 , La 2 O 3 , ZrO 2 , and SrO at varying loadings ranging from 0 to 80 wt %. The radiopacity of four commercial dental composites were also evaluated and used as a comparative data. Following standard radiographic technique, X-ray radiography of 2.5 mm thickness dental composite specimens along with pure aluminum step-wedge, a reference, were performed. The optical density of specimens was measured using a transmission densitometer and the radiopacity values of samples were expressed in term of equivalent thickness of aluminum per mm thickness of material. The lanthanum oxide filler containing composites, which is a new radiopacifying agent, exhibited the greatest radiopacity levels than all other composites, for all monomer and filler loadings studied. The radiopacity values of these composites were greater than that of human dental enamel. Strontium oxide containing composites were less radiopaque than other materials especially in the case of composites based on (Bis-GMA/TEGDMA): (25/75). The composites containing more than 10 wt % of BaO, BaSO 4 , and ZrO 2 for monomer compositions of (75/25) and (50/50) had radiopacity values greater than that of enamel.

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“…Initial testing indicated that glass particles of very small size (less than a few pm in diameter) caused a large reduction in optical translucency of the cured specimens. Therefore, another powder was prepared like the foregoing, except that before silane treatment, the glass was mixed about 8 times with 95% ethanol and all but the last mixture was allowed to stand undisturbed for 2 to 16 hours, after which the cloudy supernatant liquid was decanted and discarded. The silane was added to the last glass-ethanol mixture.…”

Section: Introductionmentioning

confidence: 99%