Table 3.

Mean plaque and bleeding on probing on implant level at 6, 12, 24 and 36 month for each study group and mean difference between respectively equicrestally versus subcrestally placed implants and implants with moderately rough versus minimally rough neck; p < 0.05 indicates a statistically significant difference (paired t-test).

Plaque
	Group 1: Equicrestal	Group 2: Subcrestal	Paired Difference
	Mean (SD)	Mean (SD)	Mean dif	95% CI	p
6 months	0.44 (0.47)	0.52 (0.45)	−0.083	(−0.221,0.055)	0.224
12 months	0.45 (0.39)	0.56 (0.44)	−0.115	(−0.285,0.056)	0.178
24 months	0.42 (0.40)	0.51 (0.40)	−0.091	(−0.178,−0.003)	0.042
36 months	0.39 (0.43)	0.41 (0.42)	−0.022	(−0.148,0.104)	0.724
	Group 3: Moderately Rough Neck	Group 4: Minimally Rough Neck	Paired Difference
	Mean (SD)	Mean (SD)	Mean dif	95% CI	p
6 months	0.38 (0.33)	0.40 (0.31)	−0.025	(−0.144,0.094)	0.666
12 months	0.37 (0.31)	0.35 (0.31)	0.017	(−0.136,0.169)	0.818
24 months	0.57 (0.36)	0.52 (0.36)	0.054	(−0.030,0.137)	0.189
36 months	0.39 (0.41)	0.43 (0.38)	−0.038	(−0.147,0.072)	0.481
Bleeding on Probing
	Group 1: Equicrestal	Group 2: Subcrestal	Paired Difference
	Mean (SD)	Mean (SD)	Mean dif	95% CI	p
6 months	0.15 (0.22)	0.15 (0.22)	0.000	(−0.093,0.0933)	1.000
12 months	0.19 (0.18)	0.19 (0.18)	0.000	(−0.125,0.125)	1.000
24 months	0.23 (0.30)	0.20 (0.28)	0.023	(−0.090,0.136)	0.680
36 months	0.30 (0.33)	0.23 (0.25)	0.076	(−0.048,0.200)	0.216
	Group 3: Moderately Rough Neck	Group 4: Minimally Rough Neck	Paired Difference
	Mean (SD)	Mean (SD)	Mean dif	95% CI	p
6 months	0.24 (0.31)	0.23 (0.24)	0.013	(−0.110,0.135)	0.834
12 months	0.20 (0.32)	0.23 (0.24)	−0.033	(−0.189,0.122)	0.653
24 months	0.25 (0.29)	0.30 (0.37)	−0.054	(−0.243,0.136)	0.551
36 months	0.08 (0.14)	0.07 (0.12)	0.013	(−0.084,0.109)	0.789