Table 2b.

Patient level. Radiographic data of marginal bone levels at the time of insertion (Ti), at loading (TL) and at the 10-year (T10) follow-up examination, including changes between different timepoints. Corresponding analysis on patient level for both implant systems (AST and STM). Note: Calculations of p-values for the patient level analysis were performed with Wilcoxon signed rank test (intragroup) and Wilcoxon test (intergroup) to assess their influence of the group or of the time

		AST							STM
	n	Mean ± SD (mm)	Q1	Median (mm)	Q3	Range (mm) min to max	Intra-group p-value	n	Mean ± SD (mm)	Q1	Median (mm)	Q3	Range (mm) min to max	Intra- group p-value	Inter-group p- value
Ti	22	−1.25 ± 1.03	−1.79	−1.27	−0.66	−4.01 to 0.59	< 0.001	20	−1.00 ± 1.30	−1.59	−0.85	−0.03	−4.92 to 0.65	0.001	0.252
TL	22	−0.15 ± 0.43	−0.37	−0.31	0.14	−0.83 to 1.16	0.060	20	−0.03 ± 0.60	−0.14	0.08	0.25	−1.71 to 1.10	0.651	0.085
T10	23	−0.11 ± 0.51	−0.41	−0.22	0	−0.83 to 1.29	0.103	20	−0.76 ± 1.05	−0.83	−0.48	−0.10	−4.42 to 0.06	< 0.001	0.042
TL-Ti	22	1.10 ± 1.35	0.483	1.12	1.56	−1.42 to 5.174	< 0.001	20	0.97 ± 1.47	0.37	0.82	1.61	−2.30 to 4.92	0.004	0.659
T10-TL	22	0.06 ± 0.32	−0.18	0.07	0.25	−0.49 to 0.87	0.458	20	−0.73 ± 1.37	−0.80	−0.37	−0.00	−5.52 to 0.48	0.006	0.008

AST, Astra; STM, Straumann; SD, standard deviation; Q1, first quartile; Q3, third quartile; Ti, time of insertion; TL timepoint at loading; T10, timepoint 10-years

Positive values indicate the implant shoulder to be located more coronally relative to the bone crest