Study of a hydraulic DCPA/CaO-based cement for dental applications.
A CPC was obtained by mixing calcium hydrogenphosphate (DCPA: CaHPO(4)) and calcium oxide with either water or sodium phosphate (NaP) buffers. Physical and mechanical properties such as compressive strength (CS), initial (I) and final (F) setting times, cohesion time (T(C)), dough time (T(D)), swelling time (T(S)), dimensional and thermal behavior, injectability (t(100%)), antimicrobial properties, setting reaction kinetics, and powder stability over time were investigated by varying different parameters such as liquid-to-powder (L/P) ratio (0.35 to 0.7 mL g(-1)), molar calcium-to-phosphate (Ca/P) ratio (1.67 to 3), the pH (4, 7 or 9) and the concentration (0 to 1 M) of the NaP buffer. The best results were obtained with the pH 7 NaP buffer at a concentration of 0.75 M. With this liquid phase, physical and mechanical properties depended on the Ca/P and L/P ratios, varying from 3 to 11 MPa (CS), 6 to 10 min (I), 11 to 15 min (F), 15 to 45 min (T(S)), 3 to 12 min (t(100%)), 16 min (T(D)). This cement expanded during its setting (2.5-7%), and is thus appropriate for tight filling. Finally the cement has antimicrobial activity from Ca/P = 2 and the whole properties were conserved after 8 months storage. Given the mechanical, rheological and antimicrobial properties of this new DCPA/CaO-based cement, its use as root canal sealing or pulp capping material may be considered as similar to calcium hydroxide or ZnO/eugenol-based pastes, without or with a gutta-percha point.
El Briak
Hasna
H
Faculté de Pharmacie, Centre de Recherche sur les Biopolymères Artificiels, IBMM UMR CNRS 5247, 15 Avenue Charles Flahault, Montpellier Cedex 5, France.
Durand
Denis
D
Boudeville
Philippe
P
D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001672:Biocompatible Materials; D017610:Calcium Compounds / Q000737:chemistry* / Q000494:pharmacology; D019245:Compressive Strength; D003738:Dental Cements / Q000737:chemistry* / Q000494:pharmacology; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry* / Q000494:pharmacology; D010795:Phthalic Acids / Q000737:chemistry* / Q000494:pharmacology; D012387:Root Canal Filling Materials / Q000737:chemistry; D013295:Streptococcus mutans / Q000187:drug effects; D013696:Temperature
D000900:Anti-Bacterial Agents; D001672:Biocompatible Materials; D017610:Calcium Compounds; D003738:Dental Cements; D010087:Oxides; D010795:Phthalic Acids; D012387:Root Canal Filling Materials; C007220:dimethyl 2,3,5,6-tetrachloroterephthalate; C016538:lime