[The cause of brackets lost in fixed appliance].
OBJECTIVE
To discusses the causes of brackets lost in fixed appliance.


METHODS
Thirty-eight patients received three kinds of adhesives, with a total of adhesive brackets 1,303, including 325 edgewise brackets and 978 Begg brackets. The three adhesives were JJ enamel adhesive, TF non mixed orthodontic adhesive and 3M light-cured composite.


RESULTS
The overall rate of bracket lost was 54.3% (707/1,303), including 63.8% in mandibular teeth brackets, 36.2% of maxillary teeth brackets. On statistical analysis, there were significant differences between 3M light cured composite and other two adhesives (chi(2)=24.39, 8.63, P<0.01), but no significant difference between the JJ enamel adhesive and TF no-mixed orthodontic adhesive (chi(2)=1.48, P>0.05).


CONCLUSIONS
There were many factors related to bracket lost. The lowest rate of bracket lost was noted in 3M light cured composite among three adhesives.
Pan
H Z
HZ
Department of Dentistry, Yueyang Hospital of Shanghai Chinese Medical University, Shanghai 200437, China.