Hemn  M. Sarmamy, Dara  H. Saeed, 
    echanical Properties of New Cement-Based Capping Material Prepared from Egg Shell and
Chitosan,
    Journal of Engineering and Applied Sciences,
    Volume 15,Issue 12,
    2020,
    Pages 2599-2603,
    ISSN 1816-949x,
    jeasci.2020.2599.2603,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2020.2599.2603)
    Abstract: The aim of this study was to evaluate the
compressive strength of newly prepared cement-based
capping material and biopolymer (Chitosan). The cement
was prepared from egg shells and a biopolymer
(chitosan), to provide compressive strength. Thirty
samples were prepared and their dimensions according to
American Dental Association (ADA) specification No.30
were 6 mm in height and 4 mm in diameter. Ten
experimental cement samples, 10 glass ionomer cement
samples and 10 biodent in samples were used. The
compressive strength of the formula of 1spoon of
experimental powder with 8 drops of the solution and
1drop chitosan with 8 drops polyphosphonoic acid was
25.60±0.515 MPa which was higher than that of the other
formulae. Within the limitations of the experimental
methods used in the present study, the cement-based
capping material prepared from egg shells and the
biopolymer chitosan shows an acceptable compressive
strength property.
    Keywords: Egg shell and biopolymer (chitosan);compressive strength;eggshell