K.A. ZABEL, L. FENG, L.J. SHARP, K.A. HAYES, and B.I. SUH, Bisco, Inc, Schaumburg, IL, USA
Objectives: To evaluate the performance and physical
properties of BisCover, a unique surface sealant that cures without an oxygen
inhibition layer, and compare it with other surface sealants on the market. Methods:
Products used were Biscover (B) by Bisco, Fortify Plus (F+) by Bisco, Protect-It
(PI) by Pentron and Optiguard (O) by Kerr. A layer of each product was placed
on a composite disc or a Mylar strip and light cured. The cured B was used
without any treatment while the others were wiped with a tissue or rinsed with
acetone to remove the sticky layer. Gloss was tested using a glossmeter
(Novo-Curve). Degree of Conversion (DC) was measured using FTIR-ATR. Toothbrush
abrasion (TA) was performed and loss of mass was determined. Hardness was
determined using the Barcol hardness test and the pencil test. Statistical
analysis was performed using ANOVA followed by Student-Newman-Kewls test
(p=0.05). Results:
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(n = 3)
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B
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F+
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PI
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O
|
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Gloss (GU)
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93 ± 3a
|
16 ± 2b
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15 ± 6b
|
16 ± 2b
|
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DC (%) (30s @ 500mW)
|
81 ± 7a
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39 ± 3b
|
63 ± 1c
|
72 ± 2d
|
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TA (mg)
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0.5 ± 0.1a
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3.0 ± 0.8c
|
1.7 ± 0.2b
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2.3 ± 0.5b,c
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Conclusion: The gloss of B was superior to other sealants
tested. There were no significant differences in Barcol hardness readings except
for O which tested lower. Film hardness of B was most resistant to gouges. The
degree of conversion was highest for B and decreasing for PI, O and F+
respectively. TA shows that B had much higher abrasion resistance than the
others.
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