Table II.

Results of the Bonferroni post hoc analysis. Significance was set as < 0.01. There was a significant difference in push-in force between the current interference and what we are investigating to be the optimal range of interference. There was no difference in the pull-out between the 0.5, 0.6 and 0.7 slot. In contrast, the interference values in the ‘optimal range’ showed a superior pull-out force compared with an interference of 1.1 mm and 1.3 mm

Push-in force
			Current range
	Interference	0.9 mm	1.1 mm	1.3 mm
	0.5 mm	< 0.01	< 0.01	< 0.01
Optimal range	0.6 mm	< 0.01	< 0.01	< 0.01
	0.7 mm	< 0.01	< 0.01	< 0.01
Pull-out force
			Current range
	Interference	0.9 mm	1.1 mm	1.3 mm
	0.5 mm	1	< 0.01	< 0.01
Optimal range	0.6 mm	1	< 0.01	< 0.01
	0.7 mm	0.1	< 0.01	< 0.01