Osseointegration of orthodontic microscrew implants under immediate loading in dogs / 中华口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the osteointegration of with self-drilling and self-tapping microscrew implants under immediate loading histomorphometrically.</p><p><b>METHODS</b>The buccal side of upper and lower jaws of three dogs was chosen as implant receipt site. Each dog accepted 8 implants (4 self-drilling and 4 self-tapping implants). Approximately 1.47-1.96 N continuous and constant forces were immediately applied between two microscrew implants with nickel-titanium coil spring for 9 weeks. Undecalcified sections of implants and surrounding tissue were studied with light microscope and fluorescent microscope.</p><p><b>RESULTS</b>Osteointegration was seen in all samples and no fibrous tissue was seen between bone and implant. More original bone was seen in self-drilling group. Modeling and remodeling were more active in self-tapping group. Bone-to-implant contact values were statistically significant higher in self-drilling group [(41.7 +/- 10.7)%] than in self-tapping group [(25.9 +/- 8.0)%, P<0.01].</p><p><b>CONCLUSIONS</b>Immediate loading had no influence on osteointegration in both self-drilling and self-tapping groups. The rates of bone-to-implant contact were higher in self-drilling group.</p>