. 2016 Mar 31;11(3):e0152663. doi: 10.1371/journal.pone.0152663

Table 2. Density of tissues (ρ) and speed of sound (Vsound).

	Average density ρ (kg/m³)	Reference	Vsound^* [mm/s]
Bone (cortical and trabecular)	1990	[38]	3.04E+06
Dentine	2140	[38]	3.98E+06
Cementum	2063	[39]	3.23E+06
Enamel	2958	[39]	6.19E+06
EDJ	2840	[40]	4.93E+06
PDL	1100	[41]	4.87E+05
Pulp	1000	[41]	8.71E+04

*The material speed of sound is calculated based on indication provided by [42]; see Eq (1)