Table 2.

Maximal temperature within ROI.

Drill	System	n (rpm)	Without cooling		Cooling		Cooling with cold saline
			t [s]	T max (°C)	t [s]	T max (°C)	t [s]	T max (°C)
Pilot	BEGO	800	2.82	38.4	2.49	22.4	2.85	22.0
Pilot	BEGO	1,200	1.96	25.7	2.16	22.1	3.25	21.8
Pilot	BEGO	1,500	3.58	44.8	2.69	22.8	3.32	22.1
ϕ2.5	BEGO	800	3.42	36.7	2.52	22.8	5.27	22.6
ϕ2.5	BEGO	1,200	3.45	31.0	2.72	22.5	3.95	22.4
ϕ2.5	BEGO	1,500	2.89	50.8	2.16	23.3	3.78	22.6
ϕ3.0	BEGO	800	1.99	32.8	2.23	23.4	4.48	22.1
ϕ3.0	BEGO	1,200	2.19	31.3	1.79	24.4	3.55	22.4
ϕ3.0	BEGO	1,500	2.16	39.9	2.23	23.4	4.01	22.6
Pilot	NEO	800	3.05	42.2	3.58	22.0	3.12	21.4
Pilot	NEO	1,200	2.69	42.8	3.45	22.2	3.98	22.0
Pilot	NEO	1,500	1.92	51.4	4.91	23.1	3.15	23.0
ϕ2.2	NEO	800	1.56	26.8	3.58	22.2	3.35	21.0
ϕ2.2	NEO	1,200	1.29	27.5	3.85	22.3	3.52	22.0
ϕ2.2	NEO	1,500	1.06	29.4	3.32	23.0	3.35	21.4
ϕ2.9	NEO	800	1.03	38.0	2.79	22.0	2.99	21.6
ϕ2.9	NEO	1,200	1.29	38.9	5.04	22.4	4.78	22.0
ϕ2.9	NEO	1500	1.92	42.1	2.59	22.7	2.42	21.4
Pilot	3i	800	3.28	39.9	5.21	23.3	4.15	22.0
Pilot	3i	1,200	4.74	54.3	3.18	22.6	2.49	21.6
Pilot	3i	1,500	3.88	50.8	3.12	28.3	3.42	22.0
ϕ2.3	3i	800	3.75	37.5	2.45	23.0	5.74	21.6
ϕ2.3	3i	1,200	3.65	30.4	1.89	23.3	3.98	22.2
ϕ2.3	3i	1,500	2.79	33.0	2.26	22.7	5.04	22.0
ϕ2.75	3i	800	1.79	27.2	2.36	24.0	4.01	22.1
ϕ2.75	3i	1,200	2.29	32.4	1.49	23.5	3.18	22.1
ϕ2.75	3i	1,500	3.05	31.8	2.39	23.4	3.81	22.2