West China Journal of Stomatology
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WANG Hong-ning, LIU Dong-xu, WANG Chun-ling, L譈Tao, LIU Hong, WANG Hong-ling
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Objective To evaluate the influence of periodontal ligament(PDL) injury on initial stability for immediately loaded mini-implant anchorage. Methods The sample consisted of 153 adult patients with maxillary protrusion deformity. Guiding by the positioning device designed by Choi, 306 mini-implants were inserted by selftapping in the upper right and left buccal areas between the first molars and second premolars. The mini-implants were divided into two groups according to CT scanning. The mini-implant was absolutely separated from PDL(group I), the mini -implant appeared to touch or overlay on PDL, but not contact to the adjacent roots(group Ⅱ). If orthodontic force could be applied to the mini-implants for four months, the mini-implant was recorded as successful anchorage. After immediate loading for four months, the analyses were completed by SPSS 9.0 software. Results Of the 306 inserted mini-implants, 162 were absolutely separated from PDL, 136 appeared to touch or overlay on PDL, but not contact to the adjacent roots, and 8 were excluded from this study because of injury to the adjacent root. The success rates of group Ⅰ and Ⅱ were 87.0% and 65.4% respectively. There were significant differences in the success rates between the two groups(P<0.001). The differences between the two groups in distribution of the upper right and left area had statistical significance(P<0.05). Conclusion PDL injury is one of the main reasons leading to early loosening of the mini-implant.
Key words: mini-implant, periodontal ligament, initial stability, immediately loading
WANG Hong-ning, LIU Dong-xu, WANG Chun-ling, L譈Tao, LIU Hong, WANG Hong-ling. Influence of periodontal ligament injury on initial stability for immediately loaded mini -implant[J]. West China Journal of Stomatology.
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