Characterization of calcium phosphate containing dental fluoride varnishes

Characterization of calcium phosphate containing dental fluoride varnishes

e55 d e n t a l m a t e r i a l s 2 8 S ( 2 0 1 2 ) e1–e70 3M/Espe) at 800 mW/cm2 . Samples were stored for one week after the light curing at 37 ◦ ...

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e55

d e n t a l m a t e r i a l s 2 8 S ( 2 0 1 2 ) e1–e70

3M/Espe) at 800 mW/cm2 . Samples were stored for one week after the light curing at 37 ◦ C in dry and dark air before the colorimetric evaluation. One reading per sample was performed on a white background a color guide (Byk Gardner): illuminants-A, C, D50, D55, D65, D75, F2, F6, F7, F8, F10, F11 and U30-illuminating/viewing geometry 45◦ /0◦ . Ten colorimetric parameters (CP) were measured: L*, a*, b*, C* (chroma), h◦ (hue), X, Y, Z, x, y. Linear correlations were calculated between the percentage of CQ and the CP. The R2 data are given in the following table. Results: Illuminants

A.10◦ C.10◦ D50.10◦ D55.10◦ D65.10◦ D75.10◦ F2.10◦ F6.10◦ F7.10◦ F8.10◦ F10.10◦ F11.10◦ U30.10◦

L*

a*

b*

C*

0.0027 0.0066 0.0168 0.0000 0.0266 0.0084 0.0135 0.0020 0.0007 0.0378 0.0002 0.0034 0.0002

0.4059 0.9086 0.7599 0.8147 0.8958 0.9202 0.8753 0.8556 0.9265 0.7671 0.2535 0.8050 0.2053

0.9954 0.9934 0.9949 0.9955 0.9922 0.9946 0.9934 0.9943 0.9956 0.9865 0.8944 0.9932 0.9931

0.9955 0.9920 0.9944 0.9950 0.9911 0.9933 0.9934 0.9945 0.9947 0.9860 0.8435 0.9941 0.9932

water (n = 6 per group). After 0.5, 1, 2, 4, and 6 h incubation with gentle agitation, the ion release was measured and expressed as cumulative quantity as mg/g of varnish. Calcium was measured by atomic absorption spectrophotometry. Inorganic phosphate was determined colorimetrically and fluoride was measured using an ion-specific electrode. Data were statistically analyzed (ANOVA, Tukey’s test).

Colorimetric parameters. h◦ X

Conclusions: Within the limitations of this in vitro study we can conclude: 1. The illuminant influences the correlation between the percentage of CQ and some colorimetric parameters. 2. Only some of the studied colorimetric parameters are influenced by the concentration of CQ. http://dx.doi.org/10.1016/j.dental.2012.07.127 121 Characterization of calcium phosphate containing dental fluoride varnishes T. Sato ∗ , E. Yasuda, S. Kato, E. Yoshii, T. Sakuma GC Corporation, Japan Objectives: Calcium phosphate technologies currently incorporated into fluoride dental varnish products include casein phosphopeptide-amorphous calcium phosphate (CPPACP), amorphous calcium phosphate (ACP) and tricalcium phosphate (TCP). The aim of this study was to assess the anticariogenic ability of calcium-phosphate containing fluoride varnishes. Materials and methods: Three varnishes were selected for analysis: (1) MI Varnish containing CPP-ACP (MIV, GC Corp.); (2) Vanish White Varnish containing TCP (VWV, 3M ESPE); (3) Enamel Pro Clear containing ACP (EPC, Premier). To determine the calcium, phosphate and fluoride ions release, the varnishes were applied to a surface of polyvinyl chloride plastic strips (20 mm × 40 mm) and immersed in 25 mL of distilled

0.0615 0.5763 0.0022 0.1176 0.4754 0.3737 0.5745 0.5947 0.0125 0.1649 0.6488 0.7363 0.6952

0.0387 0.0255 0.0282 0.0094 0.0098 0.0110 0.0017 0.0005 0.0435 0.0200 0.0277 0.0088 0.0051

Y

Z

x

y

0.0324 0.0050 0.0144 0.0013 0.0001 0.0004 0.0007 0.0097 0.0074 0.0049 0.0043 0.0212 0.0023

0.5741 0.5994 0.7094 0.6401 0.6180 0.6342 0.6482 0.7009 0.6944 0.6936 0.6835 0.6479 0.6994

0.9883 0.9910 0.9903 0.9892 0.9929 0.9938 0.9711 0.9849 0.9926 0.9914 0.9830 0.9760 0.9721

0.9921 0.9822 0.9875 0.9850 0.9919 0.9910 0.9818 0.9897 0.9900 0.9877 0.9449 0.9636 0.9834

Results: The results presented below are cumulative amount of released ion after 6 h incubation (mean ± SD). Varnish MIV VWV EPC

Calcium

Phosphate

1.49 ± 0.27a 0.07 ± 0.02a 0.46 ± 0.06a

1.35 ± 0.06b 0.01 ± 0.00b 5.30 ± 0.28b

Fluoride 21.78 ± 1.01c 1.45 ± 0.15c 15.45 ± 0.61c

a, b, c: Significantly different from all other values in same column (p < 0.01).

Conclusions: This study confirmed the highest release of calcium and fluoride ions from MIV containing CPP-ACP. http://dx.doi.org/10.1016/j.dental.2012.07.128 122 Surface and setting characteristics of five commercially available silicate-based cements H.M. Setbon ∗ , G. Leloup, J.G. Leprince Université catholique de Louvain, Belgium Objectives: The aim of this work was to analyze the surface composition and setting kinetics of five commercially available silicate-based cements. Both properties are relevant to the clinical use of the cements, notably regarding their interaction with living tissues and with other restorative materials.