Objectives: Recently, the implant was recognized as one of the useful methods for orthodontic anchorage. In cases where non-absorbable implants are placed, it is necessary to remove them after orthodontic treatment. The aim of this study was to investigate the possibility of the absorbable implant for orthodontic anchorage. Methods: The maxillary and mandibular bones of six male Beagle dogs (ten-months old, 10~11kg) were used. After healing periods of three months after the extraction of the 4th premolars (P4), the absorbable implant (FIXSORB-MX, Takiron company, Japan, poly lactic acid, a molecular weight 200,000, mini-screw-type 2.0x8.0mm) was inserted into the buccal side of the maxillary and mandibular bones at the root apical of the first molar. Orthodontic force of 100gf was applied by means of a closing coil that was connected to the implant and the 3rd premolar (P3). The position change of P3 and the broken strength of the implant (The universal material tester, EZ-test, Shimadzu company) were measured after loading of orthodontic force for three and six months. In the control group, the broken strength test was performed just after the insertion of the implant into the bone. T-test was performed for statistical analysis. (Each group n: 8~10) Results: 1. The loading of orthodontic force resulted in no mobility and deciduation in the implant.2. On the distance changes of distalized P3, the six-month group (9.57±1.65mm) was significantly longer than the three-month group (4.32±3.29mm). (P< 0.001) 3. On the broken strength of the implant, the six-month group (3.47±3.68 kgf) was significantly smaller than the three-month group (10.92±3.85 kgf). (P< 0.01) (Control 14.75±3.67kgf) Conclusion: The results showed that the absorbable implant had a clinically acceptable strength when the orthodontic anchorage was applied.

Back to the Dental Materials: VIII - Others-Non-metallic Program
Back to the IADR/AADR/CADR 82nd General Session (March 10-13, 2004)

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