An investigation of the physical properties of dental materials.

Souder, Wilmer; Peters, C.G.

doi:10.6028/nbst.4908

Cited by 29 publications

(10 citation statements)

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“…The CTE was calculated in the present study at the range of 20 to 50°C to compare the results with the literature findings (9,10). The reference values for the CTE of dental materials always refers to the work of the National Bureau of Standards (9) and to a compilation of the results from that findings (10). The CTE for human teeth measured at near 100% relative humidity was -6.82×10 -6 °C -1 (Table 1) indicating a contraction with temperature rise.…”

Section: Discussionmentioning

confidence: 74%

“…However, the current study was the first one to test the thermal expansion under nearly 100% relative humidity. Previously, data were collected before immersion of specimens into water or placement of specimens in a dry environment (9). The lack of expansion of dentin could be due to the structure of dentinal tubules, which could absorb the expansion by moving tubular fluid.…”

Section: Groupmentioning

confidence: 99%

“…The coefficient of thermal expansion (CTE) is normally used to describe the fractional dimensional changes of a substance in response to thermal stimuli. The evaluation of the CTE for tooth structure and restorative materials (6,7) has shown that the CTE of enamel is around 11.4×10 -6°C-1 and dentin around 8.0 ×10 -6°C-1 , while the CTE for restorative materials is different, such as resin composite materials with a CTE of 17-50×10 -6 •C -1 (8)(9)(10). Comparison of CTE between restorative materials and tooth structure has often been used to evaluate the microleakage potential resulting from thermal expansion and contraction (8,11).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the coefficient of thermal expansion of human and bovine dentin by thermomechanical analysis

Lopes¹,

Yan

Consani

et al. 2012

Braz. Dent. J.

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The mismatch of thermal expansion and contraction between restorative materials and tooth may cause stresses at their interface, which may lead to microleakage. The present work compared the coefficient of thermal expansion (CTE) with the thermomechanical behavior of human and bovine teeth and determined if the CTE is a suitable parameter to describe tooth behavior. Fifteen human third molar and 15 bovine incisor tooth slices (6×5×2 mm) were allocated to 3 groups according to the test environment: G1 - room condition, G2 - 100% humidity, G3 - desiccated and tested in dry condition. Each specimen was weighed, heated from 20 to 70ºC at 10ºC min-1 and reweighed. The CTE was measured between 20 and 50ºC. Fresh dentin (human -0.49% ± 0.27, bovine -0.22% ± 0.16) contracted on heating under dry condition. Under wet conditions, only human teeth (-0.05% ± 0.04) showed contraction (bovine 0.00% ± 0.03) accompanied by a significantly lower (p<0.05) weight loss than in dry specimens (human 0.35% ± 0.15, bovine 0.45% ± 0.20). The desiccated dentin expanded on heating without obvious weight changes (0.00% ± 0.00). The CTE found was, respectively, in dry, wet and dissected conditions in ºC(-1): human (-66.03×10(-6), -6.82×10(-6), 5.52×10(-6)) and bovine (-33.71×10(-6), 5.47×10(-6), 4.31×10(-6)). According to its wet condition, the dentin showed different CTEs. The thermal expansion behavior of human and bovine dentin was similar. A simple evaluation of the thermal expansion behavior of tooth structure by its CTE value may not be appropriate as a meaningful consideration of the effects on the tooth-material interface.

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Section: Discussionmentioning

confidence: 74%

Section: Groupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the coefficient of thermal expansion of human and bovine dentin by thermomechanical analysis

Lopes¹,

Yan

Consani

et al. 2012

Braz. Dent. J.

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“…The combination was placed in a chamber r eg ulated at 20 o ± 0.01 ° C by m eans of apparatus described by Souder and Peters [18,19]. Although this accurate temperature control was unnecessary for comparing fused quartz gages, it was essential when for a special test a quartz and a steel gage were compared.…”

Section: Producing and Calibrating End Standardsmentioning

confidence: 99%

Interference methods for producing and calibrating end standards

Peters¹,

Emerson²

1950

J. RES. NATL. BUR. STAN.

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An interferometric apparatus developed at the National Bureau of St andards for ruling meter scales in terms of wavelengths of light requires accurate determinat ion of t he length of a d ecimeter etalon . To compare the results of t he interferometric methods of measurement used a t this Bureau with those of other national laboratories, etalons of fu sed quartz having highl y polished plan e and parallel end surfaces were made and calibrated at this Bureau. They were then sen t to t he Bureau In ternational des Po ids et M esures, Physikali sh-T eeh ni sehe Reiehsan stalt, a nd The National Physical Laboratory for calibration. The lcngth s of t h e eta lons as determincd by t he vario us laborato ries are:By other Laboratory These results indi cate that d ive rse interferential methods used by the different laboratories give t hc same leng th s to an average deviation of 0.016 J.I. (1 part in 6,000,000) and to a probable uncertain ty much less.Besides furnishing a direct compari son of t he res ults obtain ed by different interferential methods, t he investigation gives values for the index of refraction of air and also wavelength values for several radiaLions of k rypton and cadmium . These are included in the paper.Because of inherent advantages of fu sed quartz etalons as separators for Fabry-Perot interferom eters, t he m ethods used in making and calibrating t hese etalons are given in detail.

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“…A number of investigations on this problem have been made. SOUDER and PETERS [1] used the interferometer for measuring the linear dimensional changes of silicate cements. Their data showed rapid contraction when the cement was exposed to air.…”

Section: Introductionmentioning

confidence: 99%