Abstract:

BACKGROUND: It is an issue of concern to increase the stability of micro-implants, reduce the failure rate, and correctly use micro-implant anchorage.
OBJECTIVE: To observe the influence on the success rate of orthodontic micro-implant using two kinds of positioning methods.
METHODS: Thirty-eight patients who required implant anchorage were evaluated. All the implants were imbedded in the alveolar bone between the maxillary second premolar and first molar. One side of each patient was randomly selected to imbed micro-implant by using X-ray film, as the A group; the other side using three-dimensional plate, as the B group.
RESULTS AND CONCLUSION: After 5-7 months of clinical use of implant anchorage, 29 micro-implants of the A group were stable, 9 loosened, AND the success rate was 76.3%; 36 micro-implants of the B group were stable, 2 loosened, and the success rate was 94.7%. The success rates of two groups were significantly different (P < 0.05). Compared with the traditional positioning method, the three-dimensional guide of orthodontic micro-implant may achieve the best implant site, thus effectively reducing implant anchorage failure rate.