Tapered, Double-Lead Threads Single Implants Placed in Fresh Extraction Sockets and Healed Sites of the Posterior Jaws: A Multicenter Randomized Controlled Trial with 1 to 3 Years of Follow-Up

Table 2

Implants distribution.

	Test	Control		All implants
Site
Maxilla	25 (51.0%)	18 (37.5%)	0.221	43
Mandible	24 (49.0%)	30 (62.5%)		54
Position
Premolars	25 (51.0%)	30 (62.5%)	0.307	55
Molars	24 (49.0%)	18 (37.5%)		42
Reason for tooth extraction
Chronic periodontal disease	10 (20.4%)	15 (31.2%)	0.437	25
Destructive caries	23 (46.9%)	21 (43.8%)		44
Root fractures or resorption	16 (32.7%)	12 (25.0%)		28
Presence of endodontic lesion
Yes	14 (28.6%)	0 (0%)	<0.001	14
No	35 (71.4%)	48 (100%)		83
All implants	49	48	—	97

= Fisher exact test.