Evaluation of Qualitative Changes in Simulated Periodontal Ligament and Alveolar Bone Using a Noncontact Electromagnetic Vibration Device with a Laser Displacement Sensor

Table 1

Resonant frequency (kHz).

Liquid volume	Simulated bone quality	Group A	Group B	Group C
		Median (minimum/maximum)
3.0 mL	Polyurethane	1.39 (1.38/1.41)	1.38 (1.36/1.41)	2.08 (2.05/2.13)
	Polyurethane foam	1.13 (1.07/1.18)	1.15 (1.11/1.16)	1.70 (1.68/1.74)
4.0 mL	Polyurethane	0.97 (0.94/1.07)	0.99 (0.97/1.04)	1.37 (1.30/1.46)
	Polyurethane foam	0.84 (0.81/0.89)	0.78 (0.74/0.84)	1.06 (1.01/1.10)
5.0 mL	Polyurethane	0.69 (0.68/0.71)	0.68 (0.65/0.70)	1.01 (0.98/1.04)
	Polyurethane foam	0.64 (0.61/0.66)	0.61 (0.60/0.63)	0.90 (0.89/0.96)

Identical lowercase letters between polyurethane and polyurethane foam values at the same liquid volume indicate that the values within groups are not significantly different ().
Identical uppercase letters among liquid volumes with the same bone quality indicate that the values within groups are not significantly different ().
Identical Roman numerals among groups with the same liquid volume and bone quality indicate that the values are not significantly different ().