Experimental study on the factors affecting torque of beam-type implant torque wrenches

BMC Oral Health

Table 6 Comparison of the accuracy and repeatability depending on the part of the beam aligned with the scale

Manufacturers	Target torque value (N cm)	Part of the beam aligned	Bias (%)	Minimum	Maximum	Mean	SD	Coefficient of variation (%)
Strauman	15	Leading edge	− 18.67	11.5	12.7	12.20	0.45	3.66
		Center	− 4.00	14.0	14.9	14.40	0.37	2.60
		Trailing edge	14.27	16.7	17.8	17.14	0.37	2.14
Nobel Biocare	15	Leading edge	− 10.27	13.0	13.9	13.46	0.38	2.85
		Center	− 2.80	14.3	15.0	14.58	0.24	1.65
		Trailing edge	11.87	16.5	17.0	16.78	0.19	1.16
Kyocera	20	Leading edge	− 6.00	18.2	19.2	18.80	0.34	1.81
		Center	2.60	19.9	20.8	20.52	0.32	1.55
		Trailing edge	14.20	22.3	23.1	22.84	0.28	1.23
GC	10	Leading edge	− 40.60	4.0	6.8	5.94	1.00	16.80
		Center	2.80	9.7	10.8	10.28	0.45	4.33
		Trailing edge	35.00	12.8	13.9	13.50	0.39	2.85
KTC	15	Leading edge	− 10.67	12.2	13.8	13.40	0.61	4.55
		Center	− 5.07	13.9	14.6	14.24	0.27	1.92
		Trailing edge	3.07	15.2	15.6	15.46	0.15	0.97
Nippon Piston Ring	20	Leading edge	− 16.60	16.1	17.1	16.68	0.44	2.61
		Center	0.50	19.8	20.3	20.10	0.17	0.83
		Trailing edge	10.90	20.9	24.0	22.18	1.19	5.37
THOMMEN	15	Leading edge	3.07	15.0	15.8	15.46	0.29	1.86
		Center	10.53	16.0	16.8	16.58	0.31	1.88
		Trailing edge	18.53	17.5	18.0	17.78	0.20	1.15
SHOFU	10	Leading edge	1.40	9.5	11.0	10.14	0.48	4.77
		Center	35.80	12.9	14.0	13.58	0.39	2.85
		Trailing edge	89.40	18.2	19.9	18.94	0.59	3.11

ISSN: 1472-6831