Evaluation Effect of Oyster Shell Powder on The Surface Hardness and Compressive Strength of Dental Stone

Ghadeer, Fatima Kadhim

doi:10.25130/tjds.12.2.9

	Evaluation Effect of Oyster Shell Powder on The Surface Hardness and Compressive Strength of Dental Stone
Tikrit Journal for Dental Sciences
Volume 12, Issue 2, December 2024, Pages 338-344 PDF (365.01 K)
DOI: 10.25130/tjds.12.2.9
Author
Fatima Kadhim Ghadeer^*
Department of Prosthetic Dental Techniques, Middle Technical university, College of Health and Medical Techniques/ Baghdad, Iraq
Abstract
Aim: This study measured the surface hardness and compressive strength of dental stone after adding oyster shell powder. Materials and methods: Forty-eight specimens of dental stone were prepared for four groups (12 specimens for each group). The dental stone specimens, without addition, were the control group, the powder of oyster shell was added to the dental stones in the three experimental groups at various weight ratios of 3%, 5%, and 7%. For each group, compressive strength and surface hardness measurements were performed. Results: the results show that an increased ratio of oyster shell powder led to a significant increase in surface hardness. There was no significant difference in compressive strength value between the control group and the two experimental groups (incorporation of 3% and 5% oyster shell powder), while the addition of 7% oyster shell powder to dental stone caused a significant decrease in compressive strength (P< 0.05). Conclusion: - increase in surface hardness by increasing the weight ratio of oyster shell powder to dental stone. However, increasing the load of oyster shell powder by more than 5% decreased the compressive strength of dental stones.
Keywords
dental stone surface hardness compressive s

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