Synthesis and Characterization of Polyamidoamine Dendrimers/Nano-hydroxyapatite and Its Role in Dentin Tubule Occlusion.

Objective To synthesis and characterization nano-composite biomaterials-polyamidoamine dendrimers/nano-hydroxyapatite (PAMAM/n-HAP),which has the properties of both organic and inorganic materials,and then evaluate its role in dentin tubule occlusion. Methods PAMAM/n-HAP was characterized and validated by Fourier transform infrared spectrometry and transmission electron microscopy after its preparation via the Pramanik aqueous-based chemical method. Scanning electron microscope was used to evaluate its role in dentin tublule occlusion. Results The peak absorption bands were found at 1244 cm(-1) and 1650 cm(-1) in Fourier transform infrared spectroscopy. A relatively low-density coating (about 10 nm) appeared on the n-HAP. The results of Fourier transform infrared spectrometry and transmission electron microscopy confirmed the successful synthesis of PAMAM/n-HAP. The scanning electron microscope showed that PAMAM/n-HAP could effectively reduce the diameter of the dentin tubule and close dentin tubule. Conclusion PAMAM/n-HAP,as a newly synthesized biomaterial,has a good binding capacity with collagen fibers with the help of superficial carboxyl. It can induce effective dentinal tubule occlusion,indicating that PAMAM/n-HAP have great potential in clinical practice for dentin hypersensitivity.