Fracture Forces of Dentin after Surface Treatment with High Speed Drill Compared to Er:YAG and Er,Cr:YSGG Laser Irradiation

Table 3

Exact dimensions, breaking force, and bending strength of the Er:YAG irradiated specimens (group 2). The mean value of the bending strength is 89.12 MPa with a standard deviation of 36.32 MPa.

Number	Thickness/mm	Width/mm	Breaking force/N	Bending strength/MPa
1	1.27	1.76	33.00	94.16
2	1.02	1.86	36.00	150.69
3	1.24	1.88	25.90	72.57
4	2.00	1.22	70.50	117.02
5	1.86	1.22	30.70	58.92
6	1.57	1.70	60.00	115.98
7	1.45	1.92	60.10	120.59
8	1.64	1.85	38.60	62.84
9	1.26	1.90	27.70	74.38
10	1.75	1.84	43.00	61.81
11	1.59	1.50	62.40	133.29
12	1.14	1.60	18.40	71.68
13	1.75	1.57	31.50	53.07
14	1.97	1.80	90.60	105.05
15	1.94	1.04	29.00	60.01
16	1.98	1.65	118.00	147.76
17	1.81	1.80	63.10	86.67
18	2.00	1.42	38.90	55.47