Bond Strength Survival of a Novel Calcium Phosphate-Enriched Orthodontic Self-Etching System after Various Ageing Protocols: An In Vitro Study

Table 4

Descriptive and inferential statistics of shear bond strengths (SBSs) of control and nHA-SEP groups of bracket debonding at 24 h water storage (24 HW), 30 min (initial), one-month water storage (1 MW), and one-month acid challenge (1 MA).

SEP groups	Ageing method	N	Min	Max	Mean SBS (MPa)	SD	Statistics: ANOVA	Statistics: t-test (control versus nHAp-SEP)
Control	24 HW	20	10.73	25.88	18.49	4.49	F = 1.631; df = 3	24 HW, initial, 1 MW, 1 MA
	Initial	20	10.77	27.97	17.91	5.69
	1 MW	20	12.74	26.97	19.77	4.06
	1 MA	20	15.88	27.92	20.8	3.73
nHAp-SEP	24 HW	20	9.76	17.85	13.46	2.67	F = 1.328; df = 3
	Initial	20	9.42	17.67	12.87	2.66
	1 MW	20	9.08	22.51	13.85	3.94
	1 MA	20	9.11	19.16	14.85	3.47

The control group produced significantly higher mean SBS values than the nHAp-SEP following all ageing methods. indicates significant differences between groups at the 0.001 level.