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KMID : 0361919970270020327
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Korean Journal of Orthodontics
1997 Volume.27 No. 2 p.327 ~ p.334
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THE EFFECT OF LIGHT CURED GLASS IONOMER CMENT OF THE SHEAR BOND STRENGTH OF ORTHODONTIC BRACKETS
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Abstract
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The purpose of this study was to evaluate clinical applicability of light cured glass ionomer cement as a othodontic
adhesive.
The metal brackets and plastic brackets were bonded with light cured glass ionomer cement(Fuji Ortho LC®) after polishing with a slurry of pumice, surface conditioning with 10% polyacrylic acid and chemically cured resin(Mono-Lok2 0) after acid etching with 38% phosphoric acid on the extracted human bicuspids. The shear bond strength was tested with a universal testing machine(HGS-100A, Shimadzu Co., Japan) after storage in normal saline at 37´C ´or 24 hours and 48 hours.
The results were as follows:
1. The shear bond strength of light cured glass ionomer cement group polished with a slurry of pumice was significantly lower than that of chemically cured resin group(P<0.01).
2. The shear bond strength of light cured glass ionomer cement group conditioned with 10% polyacrylic acid was significantly lower than that of chemically cured resin group(P<0.01).
3. The shear bond strength of light cued glass ionorner cement group conditioned with 10% polyacrylic acid was slightly higher than that of light cured glass ionomer cement group polished with a slurry of pumice, but there was no significant difference(P>0.05).
4. There was no significant difference between metal bracket group and plastic bracket group irrelevant off enamel conditioning(P>005).
In summary, although the shear bond strength of light cured glass lionomer cement was lower than that of chemically cured resin, it night be clinically applicable,
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