Er:YAG laser removal of zirconia crowns on titanium abutment of dental implants: an in vitro study

BMC Oral Health

Table 2 Removal time and shear bond strength

		Time (s)		Shear bond strength (MPa)		Removed ratio (%)
Group		Mean ± SD	Median	Mean ± SD	Median	(Proportion of demolished samples)
RXL	1 mm	201.60 ± 47.77	198.00^a	0 ± 0	0^A	100
	2 mm	226.50 ± 67.98	213.50^a	0.71 ± 1.32	0^A	70
	3 mm	300.00 ± 0	300.00^b	9.06 ± 3.85	7.66^B	0
	4 mm	300.00 ± 0	300.00^b	11.40 ± 4.10	11.22^BC	0
CSL	1 mm	274.80 ± 35.54	296.50^b	0.79 ± 1.25	0.26^A	50
	2 mm	300.00 ± 0	300.00^b	9.62 ± 4.36	8.88^B	0
	3 mm	300.00 ± 0	300.00^b	15.88 ± 4.74	15.07^C	0
	4 mm	300.00 ± 0	300.00^b	23.63 ± 8.73	23.33^D	0

Medians, means and standard deviations (SD) in s and MPa (n = 10)
Medians with the same superscript letter are not statistically different (P > 0.05). Kruskal Wallis test followed by pairwise comparison using the Wilcoxon test modified by Bonferroni

ISSN: 1472-6831