Measurement of thermophysical properties of human dentin: Effect of open porosity

Magalhaes, M. F.; Ferreira, Ricardo; Grossi, Pablo Andrade; Andrade, Rafhael M.

doi:10.1016/j.jdent.2008.04.006

Cited by 55 publications

(46 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It depends on each μ values, according to the incident radiation wavelength. For the dentin in the tubular direction, D ¼ 2.5 × 10 −3 cm 2 ∕s, 22 while for the adhesives, the TL measurements performed in this work provided similar values, D ¼ ð1.20 AE 0.04Þ × 10 −3 cm 2 ∕s. Since the exciting radiation was incident on the adhesive side of the samples, we estimate μ using the adhesives thermal diffusivity values.…”

Section: Methodssupporting

confidence: 64%

Fourier transform infrared photoacoustic spectroscopy study of physicochemical interaction between human dentin and etch-&-rinse adhesives in a simulated moist bond technique

et al. 2012

View full text Add to dashboard Cite

Abstract. The purpose of this study was to provide the physicochemical interactions at the interfaces between two commercial etch-&-rinse adhesives and human dentin in a simulated moist bond technique. Six dentin specimens were divided into two groups (n ¼ 3) according to the use of two different adhesive systems: (a) 2-hydroxyethylmethacrylate (HEMA) and 4-methacryloxyethyl trimellitate anhydrate (4-META), and (b) HEMA. The Fourier transform infrared photoacoustic spectroscopy was performed before and after dentin treatment with 37% phosphoric acid, with adhesive systems and also for the adhesive systems alone. Acid-conditioning resulted in a decalcification pattern. Adhesive treated spectra subtraction suggested the occurrence of chemical bonding to dentin expressed through modifications of the OH stretching peak (3340 cm −1 ) and symmetric CH stretching (2900 cm −1 ) for both adhesives spectra; a decrease of orthophosphate absorption band (1040 to 970 cm −1 ) for adhesive A and a better resolved complex band formation (1270 to 970 cm −1 ) for adhesive B were observed. These results suggested the occurrence of chemical bonding between sound human dentin and etch-&-rinse adhesives through a clinical typical condition.

show abstract

Section: Methodssupporting

confidence: 64%

Fourier transform infrared photoacoustic spectroscopy study of physicochemical interaction between human dentin and etch-&-rinse adhesives in a simulated moist bond technique

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The depth of analysis in the sample from the illuminated surface can then be estimated. Using D ¼ 0.0025 cm 2 ∕s for dentin oriented in the tubular direction 12 and f ¼ 16 Hz, μ s was estimated to be ∼70 μm.…”

Section: Resultsmentioning

confidence: 99%

Photosensitizer and light diffusion through dentin in photodynamic therapy

et al. 2013

View full text Add to dashboard Cite

Abstract. Photodynamic therapy has been considered a potential antimicrobial modality against oral infections, including dental caries. A model to estimate the penetration of both photosensitizers and light through human dentin, a factor of interest in photodynamic therapy, is proposed. The photoacoustic spectroscopy technique was used to evaluate in vitro dentin permeability of three different photosensitizers. Using the dentin optical absorption and scattering coefficients, it was possible to propose a semi-quantitative model predicting both photosensitizer and light doses within dentin. The graphic illustrations obtained provided guidelines that may be useful in photodynamic therapy protocols used as antimicrobial tools in caries lesions.

show abstract

“…This hypothesis might be supported by porosity data and its behavior against particle size used in setting the cement formula. 12,23,36 It is consensual that the increase in porosity alone can cause influence on the value of thermal diffusivity in cements, because the space, especially a small or narrow one representing voids could be filled up with gas, air for instance or any other kind produced by setting up from chemical reactions that is stored within pores. The thermal diffusivity of air and other gases are usually higher than cements, generally about 1 order of magnitude, what might elevate a relative to increasing grain size.…”

Section: Cer Analysismentioning

confidence: 99%

“…This negative slope can be explained by calling the composition of the emulsifier gel, used in preparing CER samples. Since the volume emulsion is mainly constituted by polymeric materials, which present thermal diffusivity at least 1 order of magnitude lower than cements, 23,[36][37][38] it could be expected. For thermal effusivity, the slope was (0.0023 6 0.0026) and for heat capacity (0.016 6 0.031), these values are in agreement with that for MTA with dispersion at most about 11% for both "e" and for "qc p. " Again, recalling the definition of thermal diffusivity a ¼ K/qc p and observing that slope of "qc p " is positive, the immediate consequence on "a" is its reduction, agreeing with the reducing or negative slope of "a.…”

Section: Influence Of Emulsion Volumementioning

confidence: 99%

Non-destructive thermal wave method applied to study thermal properties of fast setting time endodontic cement

Picolloto

Mariucci

Szpak

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

The thermal wave method is applied for thermal properties measurement in fast endodontic cement (CER). This new formula is developed upon using Portland cement in gel and it was successfully tested in mice with good biocompatibility and stimulated mineralization. Recently, thermal expansion and setting time were measured, conferring to this material twice faster hardening than the well known Angelus Mineral trioxide aggregate (MTA) the feature of fast hardening (∼7 min) and with similar thermal expansion (∼12 μstrain/ °C). Therefore, it is important the knowledge of thermal properties like thermal diffusivity, conductivity, effusivity in order to match thermally the tissue environment upon its application in filling cavities of teeth. Photothermal radiometry technique based on Xe illumination was applied in CER disks 600 μm thick for heating, with prepared in four particle sizes (25, 38, 45, and 53) μm, which were added microemulsion gel with variation volumes (140, 150, 160, and 170) μl. The behavior of the thermal diffusivity CER disks shows linear decay for increase emulsion volume, and in contrast, thermal diffusivity increases with particles sizes. Aiming to compare to MTA, thermal properties of CER were averaged to get the figure of merit for thermal diffusivity as (44.2 ± 3.6) × 10−3 cm2/s, for thermal conductivity (228 ± 32) mW/cm K, the thermal effusivity (1.09 ± 0.06) W s0.5/cm2 K and volume heat capacity (5.2 ± 0.7) J/cm3 K, which are in excellent agreement with results of a disk prepared from commercial MTA-Angelus (grain size < 10 μm using 57 μl of distilled water).

show abstract

Measurement of thermophysical properties of human dentin: Effect of open porosity

Cited by 55 publications

References 15 publications

Fourier transform infrared photoacoustic spectroscopy study of physicochemical interaction between human dentin and etch-&-rinse adhesives in a simulated moist bond technique

Fourier transform infrared photoacoustic spectroscopy study of physicochemical interaction between human dentin and etch-&-rinse adhesives in a simulated moist bond technique

Photosensitizer and light diffusion through dentin in photodynamic therapy

Non-destructive thermal wave method applied to study thermal properties of fast setting time endodontic cement

Contact Info

Product

Resources

About