Different Molarities and Dissolution-Precipitation Duration Affect the Formation of Carbonate-Apatite Blocks for Bone Graft Material

• Published in: Pesquisa brasileira em odontopediatria e clínica integrada Vol. 20
• Main Authors: Yosi Kusuma Eriwati, Raudhea Vala Yulfa, Irena Wijatmo, Bambang Irawan
• Format: Journal Article
• Language: English
• Published: Association of Support to Oral Health Research (APESB) 01.03.2022
• Subjects: Adsorption; Calcium Sulfate; Dental Materials; Tensile Strength
• ISSN: 1519-0501; 1983-4632

Objective: To determine diametral tensile strength and water absorption ability of Carbonate-apatite blocks fabricated from gypsum precursors (CaSO4) through a dissolution-precipitation method,  with different solution molarities and immersion times. Material and Methods: Thirty-six CaSO4 gypsum specimens with 6 mm diameter; 3 mm height (Group A for diametral tensile strength) and 36 specimens of 6 mm diameter; 3 mm thickness (Group B for water absorption ability) were used. Each group was divided into 4 group treatments of: 1) dissolution-precipitation in solution of 0.5mol / L Na2CO3 + 0.5mol / L Na3PO4 for 48 hours and 72 hours; 1mol / L Na2CO3 + 1mol / L Na3PO4 for 48 hours and 72 hours. The C- Ap blocks were then tested using ATR-FTIR spectrometer to identify the formation of C-Ap functional groups. Furthermore, Group A specimens were tested for diametral tensile strength using Universal Testing Machine, and Group B specimens were tested for water adsorption ability using an analytical balance by measuring initial and final weight after immersion in saline solution at 37oC for 24 hours. Results: The formation of carbonate-apatite (C-Ap) in groups with solution molarity of 1 mol/L for 48 hours and 72 hours resulted in a lower diametral tensile strength and water absorption ability than the groups with a 0.5 mol/L solution. Conclusion: Solution with different molarities and dissolution- precipitation duration affect the formation of carbonate-apatite blocks.