Prognosis of primary and secondary insertions of orthodontic miniscrews: What we have learned from 500 implants
| Autor: | Takashi Ono, Zuisei Kanno, Shunsuke Uesugi, Satoshi Kokai |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Adult
Male Treatment outcome Bone Screws Dentistry Orthodontics 03 medical and health sciences Young Adult 0302 clinical medicine Orthodontic Anchorage Procedures Medicine Humans Orthodontic Appliance Design 030212 general & internal medicine Dental Restoration Failure business.industry 030206 dentistry Prognosis Bone screws Treatment Outcome First insertion Maxilla Female business |
| Zdroj: | American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. 152(2) |
| ISSN: | 1097-6752 |
| Popis: | Introduction Although the success of using orthodontic miniscrews for primary insertion has been reported in the literature, few studies have followed up on secondary insertions after failure of the first insertion. In this study, we investigated not only the primary but also secondary success rates of miniscrews and considered the risk factors influencing their stability. Methods Five hundred miniscrews were inserted for orthodontic anchorage in 240 patients. Ninety-eight miniscrews lacked stability; thus, 77 of these were removed and reinserted. We calculated and compared the primary and secondary success rates of insertion. Moreover, we investigated which clinical parameters affected the stability of miniscrews. Results The success rate of secondary insertion (44.2%) was significantly lower than that of primary insertion (80.4%). The screw length and jaw receiving the insertion were significantly associated with the stability of miniscrews. The 8.0-mm miniscrews were significantly more stable than the 6.0-mm miniscrews, and the success rate for insertions into the maxilla was significantly higher than that for the mandible. Conclusions Secondary insertions lack stability; therefore, clinicians should be aware of the reduced success rate of reinsertion and know the risk factors to avoid failure of secondary insertions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect