Table 4.

Mean marginal bone loss (mm) and standard deviations of all the clinical variables

Variables	Bone density	Mean±SD
		3 months	6 months	9 months	1 year	1.5 years	2 years	2.5 years	3 years
Maxillary central incisors	D2	0.20±0.02	0.82±0.14	0.87±0.06	1.00±0.02	1.11±0.02	1.21±0.02	1.26±0.01	1.41±0.01
	D3	0.13±0.01	0.60±0.01	0.90±0.01	0.98±0.04	1.10±0.01	1.20±0.02	1.30±0.02	1.42±0.02
Maxillary lateral incisors	D2	0.16±0.01	0.70±0.02	0.89±0.02	0.97±0.01	1.07±0.01	1.17±0.01	1.24±0.02	1.39±0.01
	D3	0.20±0.01	0.50±0.01	0.80±0.01	1.02±0.02	1.14±0.02	1.23±0.01	1.31±0.02	1.43±0.02
Maxillary canines	D2	0.30±0.01	0.60±0.01	0.91±0.02	1.07±0.01	1.17±0.01	1.26±0.02	1.34±0.02	1.43±0.01
	D3	0.30±0.01	0.50±0.01	0.79±0.02	1.02±0.02	1.16±0.01	1.24±0.01	1.36±0.02	1.43±0.01
Maxillary anteriors (Group I)	D2	0.22±0.01	0.71±0.04	0.89±0.02	1.01±0.01	1.12±0.01	1.21±0.01	1.28±0.01	1.41±0.00
	D3	0.21±0.01	0.53±0.01	0.83±0.01	1.01±0.02	1.13±0.01	1.22±0.01	1.32±0.01	1.42±0.01
Mandibular second premolars	D2	0.20±0.01	0.31±0.01	0.70±0.01	1.00±0.01	1.11±0.04	1.25±0.02	1.34±0.02	1.45±0.01
	D3	0.32±0.01	0.57±0.05	0.70±0.01	0.92±0.02	1.03±0.07	1.22±0.01	1.36±0.01	1.45±0.02
Mandibular first molars	D2	0.21±0.01	0.31±0.01	0.56±0.03	1.00±0.04	1.20±0.02	1.30±0.01	1.38±0.01	1.45±0.01
	D3	0.33±0.02	0.53±0.02	0.72±0.02	1.02±0.01	1.13±0.01	1.25±0.01	1.36±0.02	1.47±0.01
Mandibular second molars	D2	0.33±0.02	0.53±0.02	0.74±0.02	0.98±0.01	1.10±0.02	1.27±0.01	1.34±0.01	1.47±0.01
	D3	0.33±0.01	0.54±0.02	0.73±0.02	0.93±0.02	1.13±0.01	1.26±0.01	1.34±0.02	1.47±0.01
Mandibular posteriors (Group II)	D2	0.24±0.01	0.38±0.01	0.67±0.02	0.99±0.01	1.13±0.02	1.27±0.01	1.35±0.01	1.45±0.01
	D3	0.32±0.01	0.55±0.02	0.72±0.01	0.96±0.01	1.10±0.02	1.24±0.01	1.35±0.02	1.47±0.01

D2 indicates 750-1250 Hounsfield Units and D3 indicates 375-750 Hounsfield Units in CT reformatted images. CT: Computed tomography; SD: Standard deviation