The blocking effect and abrasion resistance of hydroxyapatite with different particle sizes and morphologies for dentinal tubules

Abstract

Objective To study the blocking effect and abrasion resistance of hydroxyapatite (HA) with different particle sizes and morphologyies on dentinal tubules from the qualitative and quantitative aspects. Methods Dentin discs were etched and divided into 4 groups randomly: 20 nm HA group; 30 nm HA group; 12 μm HA group; control group (without any experimental treatment). Each group was brushed with correspondent materials for 7 days. Then, the dentin disk was divided into two parts, the one was detected by the scanning electron microscopy (SEM); the other was observed by SEM after toothbrush abrasion test. The Image⁃Pro Plus 6.0 image analysis software was used to calculate the plugging rate of dentinal tubules. Results SEM showed that the blockage is granular, the plugging rate of the den⁃ tinal tubules were about 82% to 96%. 30 nm HA group (short rod) range the first in the average plugging rate, followed by the 20 nm HA group (needles) and 12 μm HA group (spherical). After mechanical brushing for 7 days, SEM images showed that deposited layer in each group was smooth and compact, and more than 63% of the tubules still had been blocked. Conclusion HA with different particle sizes and morphologies had good plugging effect and abrasion resis⁃ tance on dentine tubules. The blocking effect of HA was affected not only by particle size but also by the morphology.

Keywords

• Hydroxyapatite
• Dentine hypersensitivity
• Dentine tubules
• Nano
• Demineralization