Objective To study the animal model suitable for the observation of early osteogenesis on the surface of titanium implant. Methods Modify implants mode which the outer thread of the implant next to the osteotomy bone wall while the inter thread keep a certain distance to osteotomy bone wall was adopted in the 1-year-old male Beagle dogs. After extraction of all mandibular premolars and first molar bilaterally in the 4 dogs, 20 implants replaced the position. All sections were stained for histological analys...