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THE EFFECTS OF BARIUM SULFATE AND IODIDE CONFOUND ON THE CHARACTERISTICS OF DENTAL ACRYLIC RESINS

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Abstract

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Ÿ³µ´Ù(p>0.05).
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¹æ»ç¼± ºÒÅõ°úµµ¿¡ ¿µÇâÀ» ÁÖ¾ú´Ù(p<0.01).
4. º» ½ÇÇè¿¡¼­ ÷°¡ÇÑ ¹æ»ç¼± ºÒÅõ°ú¼º ¹°Áú·Î´Â ¿øÇÏ´Â Á¤µµÀÇ ¹æ»ç¼± ºÒÅõ°ú¼ºÀ» ¾òÀ»
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#ÃÊ·Ï#
Aspirating or swallowing foreign bodies is a common occurrence. If they are wholly
or partly radiopaque, their localization in and progress through the gastrointestinal tract
can be more effective. Of the dental origin foreign materials swallowed, the most
common things are fragments of anterior maxillary partial denture. But the radiopacity
of denture base resins is not sufficient to determine the location of the objects.
The purpose of this study was to develop a radiopaque dental acrylic resin, which has
clinically detectible radiopacity with minimal change of mechanical properties and color.
The radiopacity, color change (CIE ¡âE) and microhardness of acrylic resins were
determined after mixing barium sulfate or iodide compound. Thermocycling couse was
conducted to determine the change of characteristic of resins after using for a long time
in the mouth.
Five or ten percent of barium sulfate to total weight of cured material was mixed
with heat curing dental arcylic resin of chemically curing orthodontic resin. In the case
of iodide compound, the mixing ratio was two or three percent. After mixing the high
radiopaque materials, resin was cured to 20¡¿20¡¿2§® plate, polished with #600 sand
paper and finally polished with Microcloth(Buehler). The specimens were thermocycled in
5 and 55¡É distilled water for 2,000 limes, and she measurement of radiopacity, color and
knickers hardness was repeated every 500 times themocyling. The radiopacity of
specimens on the X-ray films was measured with densitometer(X-rite). The color
change of determined with differential colorimeter(Model TC-6FX, Tokyo Denshoku), and
the Vickers hardness number measured with microhardness tester(Mitsuzawa).
The following results were obtained.
1. All )he three variables, the kinds of acrylic resins, the mixing or the kinds of high
radiopaque materials and, thermocycling had combined effect on the radiopacity of the
dental acrylic resins(p<0.01).
2. The two variables, the mixing or the kinds of high radiopaque materials and
thermocycling, influenced on the radiopacity of the dental acrylic resins(p<0.01). But the
kinds of acrylic resins did not Influence on the color change of mixed dental acrylic
resins(p>0.05).
3. Each of the three variables, the kinds of acrylic resins, the mixing or the kinds of
high radiopaque materials and thermocycling, influenced on the radiopacity of dental
acrylic resins(p<0.01).
4. The high radiopaque materials used in this study did not yield clinically usable
radiopacity, and the color change was eat after mixing those materials.

Å°¿öµå

dental acrylic resin; radiopacity; barium sulfate; color change;

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