title: Improved performance of diatomite-based dental nanocomposite ceramics using layer-by-layer assembly.
abstract: To fabricate high-strength diatomite-based ceramics for dental applications, the layer-by-layer technique was used to coat diatomite particles with cationic [poly(allylamine hydrochloride)] and anionic [poly(sodium 4-styrenesulfonate)] polymers to improve the dispersion and adsorption of positively charged nano-ZrO(2) (zirconia) as a reinforcing agent. The modified diatomite particles had reduced particle size, narrower size distribution, and were well dispersed, with good adsorption of nano-ZrO(2). To determine the optimum addition levels for nano-ZrO(2), ceramics containing 0, 20, 25, 30, and 35 wt% nano-ZrO(2) were sintered and characterized by the three-point bending test and microhardness test. In addition to scanning electron microscopy, propagation phase-contrast synchrotron X-ray microtomography was used to examine the internal structure of the ceramics. The addition of 30 wt% nano-ZrO(2) resulted in the highest flexural strength and fracture toughness with reduced porosity. Shear bond strength between the core and veneer of our diatomite ceramics and the most widely used dental ceramics were compared; the shear bond strength value for the diatomite-based ceramics was found to be significantly higher than for other groups (P < 0.05). Our results show that diatomite-based nanocomposite ceramics are good potential candidates for ceramic-based dental materials.
authors.affiliation: Institute of Stomatology, Nanjing Medical University, Nanjing, People’s Republic of China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Lu
authors.forename: Yang
authors.initials: Y
authors.lastname: Xia
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.forename: Yunzhu
authors.initials: Y
authors.lastname: Qian
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Zhou
authors.forename: Ning
authors.initials: N
authors.lastname: Gu
authors.forename: Feimin
authors.initials: F
authors.lastname: Zhang
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D007692:Diatomaceous Earth / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D050997:Nanomedicine; D016062:Porosity; D033081:Shear Strength; D015040:Zirconium / Q000737:chemistry
chemical_list: D003764:Dental Materials; D003776:Dental Porcelain; D007692:Diatomaceous Earth; C033787:diatomite; D015040:Zirconium; C028541:zirconium oxide