Objectives: to evaluate the failure rate using ORTHOANCHOR K1 mini-implant system in orthodontic cases and to yield clinical results for reference. Methods: the samples consist of 19 orthodontic patients (6 males and 13 females, mean age 26.5 year old) from Taipei Medical University Hospital. Forty-four K1mini-implants were implanted onto patients' maxillary (N=35) and mandibular (N=9) alveolar bone as orthodontic anchorage. All surgical procedures were conducted according to the ORTHOANCHOR K1 Operation Guide by the same surgeon. The K1 implants had been observed for 7 to 15 weeks before force application started. Results: (1) the numbers of K1 fracture during implantation and mastication were 4 and 1 respectively; (2) the numbers of K1 loosening before and after force application were 10 and 7 respectively; (3) the total failure rate of K1 implants was 50.0%; and (4) the failure rate on maxilla was higher than that on mandible (38.6% V.S. 11.4%), while the failure rate of implanted position on mucosa higher than that on attached gingival (47.7% V.S. 2.3%). Conclusions: the failure rate of K1 implant system was affected by multiple factors. Further research and clinical evaluation are required to improve the success rate.

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