Abstract:

OBJECTIVE: To analyze the effect of micro-implant anchorage on orthodontics.
METHODS: Taking “anchorage, implant” in Chinese as search terms, the related articles from January 2000 to December 2010 were retrieved. Literatures related to anchorage and implant were included, repetitive researches were excluded. Totally 16 literatures were involved for analysis. Thirty-four cases with deformities of teeth and mandible patients were selected as clinical verification. Straight wire appliance was used in the align and leveling with 0.046 cm × 0.064 cm stainless steel rectangular wire sliding method to adduct anterior teeth. At the same time, micro-pure titanium implant was implanted into first molar and second premolar gingival margin of 5-8mm in both sides of the maxillary. Elastic traction was used to shut interdental space between implant and upper lateral incisor distal traction hook. Each side with 150-200 g forces sliding adduction six front teeth. After implantation, X ray cephalometry was shot, cephalometric roentgenogram was analyzed, and then compared with before treatment.
RESULTS: At present in orthodontics, common methods of enhancement of anchorage including facebow, palatal arch, Nance bow, implant. Studies have demonstrated that traditional method is difficult to obtain completely absolute anchorage, and difficult to achieve curative effect of unmovable anchorage molar. According to clinical validation, the change of SNA, SNB and ANB with micro-implant anchorage is little, and there was no significant difference. The axis and crown of upper and lower incisor teeth have obvious changes; U1-NA distance was reduced 4.5 mm, L1-NB distance was reduced 2.6 mm, there was significant difference. Maxillary first molar crown only moved 0.4 mm to mesiocclusion, there was no obvious significance (P > 0.05).
CONCLUSION: Although micro-implant is not absolute anchorage, it can maximize to protect molar anchorage, control molar anterior displacement, in order to achieve ideal therapeutic efficacy.