Abstract
ObjectiveThe purpose of this study was to examine the effects of different implant neck designs on securing the quantity and quality of peri-implant hard tissue during the period of healing after implant placement. Materials and methodsThree types of implants with different neck morphologies (no thread, a macro-thread, and a micro-thread) were placed in the femur and tibia of six adult male New Zealand white rabbits. After 3 and 8 weeks, animals were sacrificed and subjected to micro-computed tomography (CT) and histological assessments. ResultsAll implants were clinically, radiographically, and histologically osseointegrated at the time of euthanasia. Micro-CT data revealed that the micro-thread design had a higher number and wider trabecular bone attachment than other implant designs after 3 and 8 weeks. The results of toluidine blue staining demonstrated that the percentages of bone-to-implant contact (%BIC) and new bone area (%NBA) were significantly higher with type C than with the other types after 3 weeks. After 8 weeks, the %NBA of type C was higher than that of type A. ConclusionOur results suggest that an implant with a micro-thread at the implant neck promotes faster osteogenesis and a greater amount of new bone around the implant.
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