Introduction: Glass ionomer cements (GIC) are one of the dental materials that are often used and have biocom-patibility properties. GIC has a silica composition of 29%. Penaeus monodon shell is a waste of production that is found in the export industry. One of the contents of the Penaeus monodon shell is silica which can be used as a candidate for dental materials. This aim of this research is to study Penaeus monodon shell powder as a candidate fo dental materials. Methods: This research is descriptive observational research. The research sample used was Penae-us monodon shell powder were tested by with XRD test (x-ray diffraction). Results: After XRD test, the composition of Penaeus monodon shell powder is 69% silicon oxide (SiO2) and 31% calcium carbonate (CaCO3). Conclusion:Penaeus monodon shell powder can be used as a candidate for dental materials.