Table 2. Mean, standard deviation and summary of the one-factor ANOVA of the EMG normalized values (mV) of the sternocleidomastoid, deltoid, pectoralis major, biceps brachii, brachioradialis and abductor pollicis right muscles during the performance of cavity prep.

Tooth	Finger rest positions
	No finger rest	Usual rest position	Ergonomic rest position	SS	df	MQ	F	π	η2	p
Sternocleidomastoid
16	53.596 ± 20.496	44.965 ± 14.246	45.817 ± 17.216	452.504	2	226.252	0.738	0.162	0.052	0.487
26	46.193 ± 25.095	49.874 ± 18.184	40.752 ± 19.602	421.234	2	210.617	0.470	0.119	0.034	0.630
36	47.483 ± 24.435	45.724 ± 19.832	47.482 ± 28.242	20.620	2	10.310	0.017	0.052	0.001	0.983
46	47.081 ± 26.570	50.831 ± 23.851	46.222 ± 26.435	120.159	2	60.079	0.091	0.063	0.007	0.913
Deltoid
16	8.724 ± 1.762	7.673 ± 2.636	9.036 ± 2.438	10.212	2	5.106	0.957	0.063	0.007	0.397
26	9.335 ± 2.255	8.713 ± 2.209	7.312 ±3.034	21.472	2	10.736	1.679	0.322	0.111	0.205
36	12.812 ± 3.019A	6.240 ± 3.928B	5.850 ± 3.155B	306.090	2	153.045	13.306	0.995	0.496	<0.001
46	8.806 ± 2.004	7.373 ± 3.113	7.645 ± 3.140	11.594	2	5.797	0.738	0.162	0.052	0.488
Pectoralis major
16	66.409 ± 17.055A	48.615 ± 33.543AB	38.705 ± 23.994B	3,941.164	2	1,970.582	2.968	0.529	0.180	0.027
26	57.786 ± 21.803A	43.074 ± 14.169AB	37.513 ± 11.786B	2,194.455	2	1,097.227	4.039	0.670	0.230	0.029
36	50.843 ± 17.566	44.994 ± 14.451	39.462 ± 11.439	647.814	2	323.907	1.499	0.291	0.100	0.241
46	42.489 ± 13.161	39.952 ± 15.114	34.306 ± 11.449	374.684	2	187.342	1.055	0.215	0.072	0.362
Biceps brachii
16	0.134 ± 0.027A	0.663 ± 0.156B	0.096 ± 0.057AB	0.023	2	0.012	7.975	0.932	0.371	0.002
26	0.151 ± 0.027A	0.072 ± 0.024B	0.095 ± 0.053B	0.033	2	0.016	11.563	1.000	0.461	<0.001
36	0.325 ± 0.073A	0.246 ± 0.122AB	0.216 ± 0.079B	0.063	2	0.031	3.511	0.605	0.206	0.044
46	0.254 ± 0.064A	0.102 ± 0.036B	0.130 ± 0.097B	0.130	2	0.065	12.974	0.994	0.490	<0.001
Brachioradialis
16	0.168 ± 0.037A	0.108 ± 0.306B	0.106 ± 0.235B	0.025	2	0.013	13.093	0.994	0.492	<0.001
26	0.157 ± 0.026A	0.117 ± 0.021B	0.106 ± 0.206B	0.015	2	0.007	13.575	0.996	0.501	<0.001
36	0.171 ± 0.031	0.137 ± 0.026	0.157 ± 0.513	0.006	2	0.003	2.089	0.391	0.134	0.143
46	0.162 ± 0.023	0.142 ± 0.270	0.142 ± 0.290	0.003	2	0.001	1.610	0.310	0.107	0.219
Abductor pollicis
16	1.236 ± 0.376A	0.938 ± 0.378AB	0.813 ± 0.259B	0.946	2	0.473	4.036	0.670	0.230	0.029
26	2.400 ± 0.363A	1.562 ± 1.016B	0.834 ± 0.364B	12.279	2	6.139	14.206	0.997	0.513	<0.001
36	1.814 ± 0.482A	1.086 ± 0.535B	1.209 ± 0.609AB	3.034	2	1.517	5.110	0.777	0.275	0.013
46	1.633 ± 0.516	1.207 ± 0.508	1.118 ± 0.479	1.519	2	0.760	3.021	0.537	0.183	0.065

Notes:

Tukey’s or Games-Howell’s post-hoc tests.

A, B, AB, Equal capital letters in bold indicate statistical similarity between the compared groups (columns), while different capital letters indicate statistical difference between the groups (columns).