A clinical and histological evaluation of titanium mini-implants as anchors for orthodontic intrusion in the beagle dog.

The aim of this study was to determine the anchorage potential of the titanium mini-implant for orthodontic intrusion of the mandibular posterior teeth. Six mini-implants were surgically placed around the mandibular third premolars on each side in 3 adult male beagle dogs. On the buccal site, three mini-implants were placed distal to the apex of the distal root of the third premolar, at the interradicular septa of the third premolar, and mesial to the apex of the mesial root of the third premolar, as linearly as possible. The same procedure was performed at the lingual site on both sides of the mandibular third premolars in each dog. Bilateral interradicular mini-implants on both the buccal and the lingual sites were used as the anchorage for the intrusion of the third premolars (loaded implants) and the other mini-implants were used as control (unloaded) implants. In 6 weeks, an intrusive force (150 g) was applied between the interradicular implants on the buccal and the lingual sites by closed coil springs run across the crowns of the third premolars. After 12 to 18 weeks of orthodontic intrusion, the animals were killed and their mandibles were dissected and prepared for histologic and fluorescent observation. The results indicated that the mandibular third premolars intruded 4.5 mm, on average, after 12 to 18 weeks of orthodontic force application, with mild root resorption at the furcation area as well as the root apex. All the mini-implants remained stable during orthodontic tooth movement without any mobility or displacement. The morphometrical findings indicated that the calcification of the peri-implant bone on the loaded implants was equal to or slightly greater than those of the controls. In addition, 6 of the 36 mini-implants were removed after tooth movement, and all of them were easily removed with a screwdriver. These findings suggest that mini-implants are effective tools for the anchorage of orthodontic intrusion in beagle dogs.

[1]  H. Kurabayashi,et al.  Endosseous titanium implants as anchors for mesiodistal tooth movement in the beagle dog. , 2000, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[2]  K. Tanne,et al.  Histological and histochemical quantification of root resorption incident to the application of intrusive force to rat molars. , 1999, European journal of orthodontics.

[3]  H. Mitani,et al.  Skeletal anchorage system for open-bite correction. , 1999, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[4]  Nilgün Akin-Nergiza,et al.  Reactions of peri-implant tissues to continuous loading of osseointegrated implants. , 1998 .

[5]  R. Kohal,et al.  Changes in peri-implant tissues subjected to orthodontic forces and ligature breakdown in monkeys. , 1998, Journal of periodontology.

[6]  H. Wehrbein,et al.  Orthodontic anchorage capacity of short titanium screw implants in the maxilla. An experimental study in the dog. , 1997, Clinical oral implants research.

[7]  J. FernándezValerón,et al.  Implants in the orthodontic and prosthetic rehabilitation of an adult patient: a case report. , 1996 .

[8]  M. Buckley,et al.  Intrusion anchorage potential of teeth versus rigid endosseous implants: a clinical and radiographic evaluation. , 1995, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[9]  H. Wehrbein,et al.  Endosseous titanium implants during and after orthodontic load--an experimental study in the dog. , 1993, Clinical oral implants research.

[10]  K. Higuchi,et al.  The use of titanium fixtures for intraoral anchorage to facilitate orthodontic tooth movement. , 1992, The International journal of oral & maxillofacial implants.

[11]  G. Anneroth,et al.  Titanium implant anchorage in orthodontic treatment an experimental investigation in monkeys. , 1990, European journal of orthodontics.

[12]  Y Zilberman,et al.  Osseous adaptation to continuous loading of rigid endosseous implants. , 1984, American journal of orthodontics.

[13]  E. L. Dellinger.  A histologic and cephalometric investigation of premolar intrusion in the Macaca speciosa monkey. , 1967, American journal of orthodontics.

[14]  A. Morse.  Formic Acid-Sodium Citrate Decalcification and Butyl Alcohol Dehydration of Teeth and Bones for Sectioning in Paraffin , 1945 .

[15]  R Kanomi,et al.  Mini-implant for orthodontic anchorage. , 1997, Journal of clinical orthodontics : JCO.

[16]  R K Gongloff,et al.  Rigid endosseous implants for orthodontic and orthopedic anchorage. , 1989, The Angle orthodontist.

[17]  Van Roekel Nb.  Use of Brånemark system implants for orthodontic anchorage: report of a case. , 1989 .

[18]  A. Villanueva.  A bone stain for osteoid seams in fresh, unembedded, mineralized bone. , 1974, Stain technology.