TY  - JOUR
T1  - The Effect of Three Different Calcium Hydroxide Combinations on Root Dentine Microhardness
AU - , Seyed Mohsen Hasheminia AU - , Sadegh Norozynasab AU - , Mahboobe Feizianfard 
JO  - Research Journal of Biological Sciences
VL  - 4
IS  - 1
SP  - 121
EP  - 125
PY  - 2009
DA  - 2001/08/19
SN  - 1815-8846
DO  - rjbsci.2009.121.125
UR  - https://makhillpublications.co/view-article.php?doi=rjbsci.2009.121.125
KW  - Calcium hydroxide
KW  -microhardness
KW  -root dentine
AB  - The aim of this study, was to evaluate the effect of a calcium hydroxide-glycerin mix, calcium hydroxide-saline mix and calcium hydroxide-distilled water mix on the microhardness of root dentine after 7 and 14 days of treatment. In this <I>in vitro</I> study, 15 freshly extracted maxillary canine and central incisor teeth were used. The crowns of the teeth were removed and the canals were prepared. The teeth were sectioned transversally to produce a total of 30 dentine discs from the middle-third of the root. The specimens were then divided into 3 groups of 10 discs each. Dentine samples were proximate with calcium hydroxide-glycerin mix, calcium hydroxide-saline mix or calcium hydroxide-distilled water mix for 7 and 14 days. Dentine microhardness was measured with a Vicker&#8217;s indenter with a load of 200 g for 15 second before and after treatment. Data were statistically analyzed using repeated measure analysis, paired t-test and LSD. Statistical analysis showed that all 3 combinations decreased dentine microhardness. After 7 days, the reduction in dentin microhardness following the use of a calcium hydroxide glycerin combination was significantly greater than that of a calcium hydroxide-saline and calcium hydroxide-distilled water combination. After 14 days, the reduction in dentine microhardness following the use of calcium hydroxide-distilled water combination was considerably greater than that of the other 2 groups. According to the results of this study, the use of calcium hydroxide combinations as an intra canal dressing softens dentine. At 7 days period, calcium hydroxide-glycerin combination decreased the microhardness of dentine more than two others, but at 14 days period calcium hydroxide-distilled water combination was most reductive.
ER  -