Table 1.

Minimum and maximum registered dimensions for face (external) and base (internal) slot height in each upper right central incisor bracket and mean difference to expected value.

Bracket		Minimum	% Deviation from Expected (0.022″)	Maximum	% Deviation from Expected (0.022″)	Range	Mean Difference to Expected Value	p-Value
American Orthodontics Radiance Plus®	External.	23.07	4.90%	23.62	7.40%	0.55	1.363	***
	Internal	20.75	−5.7%	21.86	−0.6%	1.11	−0.565	*
American Orthodontics 20/40®	External.	23.62	7.40%	24.49	11.30%	0.87	2.043	***
	Internal	23.11	5.10%	23.39	6.30%	0.28	1.223	***
DB Orthodontics Spa®	External.	23.03	4.70%	24.09	9.50%	1.06	1.404	**
	Internal	21.14	−3.9%	22.6	2.70%	1.46	−0.262	0.391
Forestadent Glam®	External.	23.54	7%	24.09	9.50%	0.55	1.699	***
	Internal	20.2	−8.2%	21.97	−0.1%	1.77	−0.894	*
Ormco Symetri®	External.	23.94	8.80%	25.75	17.10%	1.81	2.815	**
	Internal	20.79	−5.5%	21.69	−1.4%	0.9	−0.652	*
OrthoCare Purity®	External.	22.64	2.90%	23.62	7.40%	0.98	0.949	**
	Internal	22.17	0.80%	22.68	3.10%	0.51	0.458	*
TOC Ghost Advanced®	External.	25.94	17.90%	27.36	24.40%	1.42	4.582	***
	Internal	22.91	4.10%	25.47	15.80%	2.56	2.303	**
TOC Verve®	External.	23.46	6.60%	24.09	9.50%	0.63	1.747	***
	Internal	23.03	4.70%	24.06	9.30%	1.03	1.379	**
TP	External.	23.62	7.40%	24.49	11.30%	0.87	2.003	***
Orthodontics ClearVu®	Internal	23.7	7.70%	24.09	9.50%	0.39	1.901	***
TP	External.	24.06	9.40%	24.49	11.30%	0.43	2.326	***
Orthodontics InVu®	Internal	23.62	7.40%	24.57	11.70%	0.95	2.169	***
3M Clarity Advanced®	External.	22.68	3.10%	23.7	7.70%	1.02	1.263	**
	Internal	22.2	0.90%	23.15	5.20%	0.95	0.664	*

All values given in 1/1000th of an inch. ‘External’ refers to external (face) slot height and ‘Internal’ refers to internal (base) slot height. (*** p ≤ 0.001; ** p ≤ 0.01; * p ≤ 0.05) using One-Sample t-Test.