id	keyword
dentistry3000-24	pore
dentistry3000-24	samples
dentistry3000-24	cement
dentistry3000-24	ultrasonic
dentistry3000-24	strength
dentistry3000-24	gas
dentistry3000-24	surface
dentistry3000-24	portland
dentistry3000-24	method
dentistry3000-24	group
dentistry3000-24	materials