Porosity and Color of Maxillofacial Silicone Elastomer

Hatamleh, Muhanad M.; Watts, David C.

doi:10.1111/j.1532-849x.2010.00652.x

Cited by 28 publications

(35 citation statements)

References 29 publications

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“…For the fair specimens, perceptibility/acceptability thresholds were considered equal to 1.1/ 2.1 and 1.6/4.4 for the dark specimens 25 . Different values were presented by Han, et al 14 (2010), concerning color changes in the maxillofacial elastomers with and without pigments, equal to 1.1 and 3 for perceptibility and acceptability thresholds, respectively 11 . Since the examined materials were non-pigmented in the present study, color changes greater than 1.1 were considered as eye detectable and greater or equal to 3 as clinically unacceptable.…”

Section: Resultsmentioning

confidence: 99%

“…The CIeLAB system uses the three dimensionless colorimetric parameters L, a, b whereby L indicates the brightness, a describes the red-green content and b the yellow-blue content 18 . The samples were able to serve as controls, since they were not damaged or otherwise affected by the measurements and could be measured before and after the disinfection procedures 14,15,29 . Three readings were taken for each sample, and the mean values were automatically calculated and recorded by the colorimeter.…”

Section: Methodsmentioning

confidence: 99%

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Effect of different disinfecting procedures on the hardness and color stability of two maxillofacial elastomers over time

et al. 2013

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Objective:Disinfection procedures often cause deterioration in a maxillofacial prosthesis. Color and hardness alterations could lead to a replacement of the prosthesis. Material and Methods:An experimental chlorinated polyethylene (CPE) and a commercial polydimethyl siloxane (PDMS) sample were treated with four different disinfection procedures for a period which simulates 1 year of clinical service. The applied disinfection procedures included microwave exposure and immersion in three solutions, sodium hypochlorite, neutral soap and a commercial disinfecting soap. Shore A hardness (ΔΗ) and color differences (ΔΕ) were determined before and after each procedure. All data were analyzed by Two Way Analysis of Variance (ANOVA) and Tukey's post hoc tests at a level of α=0.05. Results:The samples presented significant alterations in color and hardness after the different disinfection treatments. The color differences (ΔΕ) were at least eye detectable in all cases and clinically unacceptable in most of the cases, with values ranging from 1.51 to 4.15 and from 1.54 to 5.92 for the PDMS and CPE material, respectively. Hardness was decreased after all the disinfection procedures in the PDMS, while for the CPE, a decrement was observed after disinfection with sodium hypochlorite and neutral soap and an increment after microwave exposure and the disinfection with a commercial antimicrobial agent. The PDMS samples presented greater alterations in color and hardness after disinfection with sodium hypochlorite solution, while the microwave exposure caused negligible effects. The CPE samples were affected most after disinfection when treated with neutral soap, and more slightly when disinfected with sodium hypochlorite solution. Conclusions:The disinfection procedures caused alterations in color and hardness of the examined materials. The most suitable disinfection procedure for the PDMS material is microwave exposure, while disinfection with sodium hypochlorite solution is not recommended. The CPE material is suggested to be disinfected with sodium hypochlorite solution and the use of neutral soap is not recommended. Comparing the two materials, the PDMS material is most color stable, while the CPE material presented fewer changes in hardness.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of different disinfecting procedures on the hardness and color stability of two maxillofacial elastomers over time

et al. 2013

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“…On the other hand, micro-CT analysis has been successfully used to perform volumetric measurements of root canal fillings and other dental materials (19,20), albeit on much lower magnifications. Its nondestructive 3D nature allowed for accurate and rapid observation of the internal structure of the samples and the quantification of voids and gaps without the need to section the roots and hence the creation of artifacts.…”

Section: Discussionmentioning

confidence: 99%

A Micro–Computed Tomography Evaluation of Mineral Trioxide Aggregate Root Canal Fillings

El-Ma'aita

Qualtrough

Watts

2012

Journal of Endodontics

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“…μ CT technology has been used to assess root canal morphology [19, 20] and root canal obturation [15], quantitatively as well as qualitatively. Also, μ CT analysis has been used to evaluate root canal fillings and other dental materials in 3D reconstructions [21, 22]. In this study the μ CT scanner accurately quantified the distribution of gutta-percha around the carriers.…”

Section: Discussionmentioning

confidence: 99%

An In Vitro Assessment of Gutta-Percha Coating of New Carrier-Based Root Canal Fillings

Al-Hashimi

Foxton

Romeed

et al. 2014

The Scientific World Journal

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The first aim of this paper was to evaluate the push-out bond strength of the gutta-percha coating of Thermafil and GuttaCore and compare it with that of gutta-percha used to coat an experimental hydroxyapatite/polyethylene (HA/PE) obturator. The second aim was to assess the thickness of gutta-percha around the carriers of GuttaCore and HA/PE obturators using microcomputed tomography (μCT). Ten (size 30) 1 mm thick samples of each group (Thermafil, GuttaCore, and HA/PE) were prepared. An orthodontic wire with a diameter of 0.5 mm was attached to the plunger of an Instron machine in order to allow the push-out testing of the gutta-percha coating. Five samples of (GuttaCore and HA/PE) were scanned using μCT. The data obtained were analysed with one-way analysis of variance and Tukey post hoc test. HA/PE obturators exhibited significantly higher push-out bond strength (P < 0.001) determined at 6.84 ± 0.96 than those of Guttacore around 3.75 ± 0.75 and Thermafil at 1.5 ± 0.63. GuttaCore demonstrated significantly higher bond strength than Thermafil (P < 0.001). μCT imaging revealed that the thickness of gutta-percha around the experimental HA/PE carrier was homogeneously distributed. The bondability and thickness of gutta-percha coating around HA/PE carriers were superior to those of GuttaCore and Thermafil obturators.

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Porosity and Color of Maxillofacial Silicone Elastomer

Abstract: In fabricating maxillofacial prostheses, mechanically mixing silicone under vacuum produces pore-free prostheses, tending to enhance their color production and stability.

Cited by 28 publications

References 29 publications

Effect of different disinfecting procedures on the hardness and color stability of two maxillofacial elastomers over time

Effect of different disinfecting procedures on the hardness and color stability of two maxillofacial elastomers over time

A Micro–Computed Tomography Evaluation of Mineral Trioxide Aggregate Root Canal Fillings

An In Vitro Assessment of Gutta-Percha Coating of New Carrier-Based Root Canal Fillings

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