Mastication Wear of Two Low Profile Attachment Systems for Overdenture: An In Vitro Study

Table 3

Results of the retention test performed with pink matrix.

(a)

		Test °	1	2	Difference between 1 and 2
		Matrix	0 cycles	400.000 cycles
Group	Attachment	Patrix	0 cycles	400.000 cycles
A	L	Mean ± SD	24.1748 ± 3.2646	19.1077 ± 0.5004	-20.96%
A	NL		24.6844 ± 3.6536	19.3199 ± 0.9977	-21.73%
B	L		31.4685 ± 4.0374	18.0411 ± 1.4338	-42.67%
B	NL		35.0551 ± 2.875	15.746 ± 1.501	-55.08%

(b)

		Test °	3	4	Difference between 3 and 4
		Matrix	0 cycles	400.000 cycles
Group	Attachment	Patrix	400.000 cycles	800.000 cycles
A	L	Mean ± SD	25.7573 ± 2.4303	20.4907 ± 0.6287	-20.45%
A	NL		25.4889 ± 3.789	21.4927 ± 1.1888	-15.68%
B	L		32.649 ± 4.2927	21.5418 ± 1.6351	-34.02%
B	NL		29.2533 ± 3.6557	24.5668 ± 2.3136	-16.02%

(c)

		Test °	5	6	Difference between 5 and 6
		Matrix	0 cycles	400.000 cycles
Group	Attachment	Patrix	800.000 cycles	1.200.000 cycles
A	L	Mean ± SD	26.2802 ± 3.5966	23.2298 ± 1.2188	-11.61%
A	NL		26.5362 ± 2.4276	21.0904 ± 0.7476	-20.52%
B	L		33.178 ± 7.0549	21.0805 ± 2.0535	-36.46%
B	NL		49.3771 ± 6.9115	21.941 ± 3.3065	-55.56%

L: loaded side. NL: non-loaded side. All data, except for differences expressed as a percentage, are expressed in Newtons.