[Application of slightly acidic hypochlorous acid water to the dental field--setting expansion and compressive strength of dental gypsum mixed with slightly acidic hypochlorous acid water].
OBJECTIVE
This study investigated both the setting expansion and compressive strength of dental gypsum mixed with slightly acidic hypochlorous acid water for the prevention of hospital infection.


METHODS
Slightly acidic hypochlorous acid water (PURESTER Mp-240B, Morinaga Milk Industry) was used to mix each of three types of gypsum (model plaster, dental stone and high strength dental stone), and both the setting expansion and compressive strength of these gypsum products were analyzed in comparison with those mixed with tap water.


RESULTS
1. With regard to the setting expansion, a significant difference was not observed between gypsum products mixed with the two types of water, except for both the model plaster and dental stone 30 minutes after the start of mixing. 2. Regarding the compressive strength, a significant difference was not observed between gypsum products mixed with the two types of water, except for the model plaster 90 minutes after the start of mixing.


CONCLUSIONS
From the results of the study, it was revealed that both the setting expansion and compressive strength of gypsum products using the slightly acidic hypochlorous acid water showed almost the same characteristics as those using tap water.
Yamashita
Shuichiro
S
Department of Oral and Maxillofacial Biology, Graduate School of Oral Medicine, Matsumoto Dental University. syama@mug.biglobe.ne.jp
Kato
Mitsuo
M
Akiyama
Shiho
S
Koike
Hideyuki
H
Numao
Hisaya
H
Komachiya
Miho
M
Terashima
Nobuyoshi
N
Ito
Mitsuo
M
D002133:Calcium Sulfate / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D006851:Hydrochloric Acid; D006863:Hydrogen-Ion Concentration; D012996:Solutions
D012996:Solutions; D006851:Hydrochloric Acid; D002133:Calcium Sulfate