HOME > Abstract
COMPARISON OF THE ACCURACY OF STONE CASTS MADE FROM ALGINATE IMPRESSION MATERIAL BY MIXING METHODS AND APPLICATION OF TRAY ADHESIVE 알지네이트 인상재의 혼합방법과 트레이 어드헤시브 도포에 따른 모형의 정확도 비교
in-Hyung Kim, Moon-Kyu Chung
김진형, 정문규

The use of alginate impression materials today is prevalent because of its efficiency and sim-
plicity in clinical settings. Unfortunately, the simplicity of the procedure tends to lull the dentist
into a sense of well-being, and lead him into using careless or sloppy technique. Alginate impres-
sion materials  are  used  to  fabricate  diagnostic  and  preliminary  casts,  and  the  final  cast.
Incorrect use of this material is known to affect  the accuracy of the final prosthesis.
The purpose of this study was to compare the effect of different mixing methods of alginate impres-
sion material and tray adhesive on the accuracy of the stone cast produced by each method.
A total of 30 stone casts were produced by using 3 different types of mixing methods (10 stone
cast for each mixing method, respectively).
The first method utilized an automatic-mixing machine to mix alginate while the second method
was carried out manually, strictly following manufacturer’ s instructions. The third method also
involved manual mixing, but did not follow the manufacturer’ s instructions and was done in a
random fashion.
Also, 20 additional stone casts were produced by using alginate with or without tray adhesives
were included in the study to evaluate effects of tray adhesives on the accuracy of alginate impres-
sion. 10 stone casts were produced by adding tray adhesives to the interior  surface of the impres-
sion tray prior to taking the impression. The other 10 excluded this step.
A total of 50 stone casts were analyzed by the three-dimensional measuring machine to mea-
sure and compare the dimensional changes of the impression material of each group. The results
are as follows.
1. No significant difference was found between the automatic mixing group and the manually-mix-
ing group(p>0.05).
2. For the group that followed manufacturer’ s instructions, less dimensional changes were record-
ed than the group that didn’ t in measuring distance d4(p<0.05).
3. The group that used tray adhesives showed less dimensional changes(p<0.05).
The findings revealed that mechanical methods of mixing alginate impression materials had lit-
tle  influence  on  dimensional  changes. However,  it  is  proven  that  following manufacturers
instructions in alginate impression taking is an important step in acquiring accurate impressions
and tray adhesives may play an important role in enhancing the results.

* Keywords: Alginate impression material, Automatic mixing machine, Tray adhesive, Manufacturer’ s nstruction

* 주요단어: