A clinical study of the effects of orthodontic appliances on the gingival tissue / 대한치과교정학회지

ABSTRACT

Fifty subjects who were to be treated with fixed orthodontic appliances by light wire edgewise technique were selected. Bands with different marginal depth were made in first molar and direct bonding brackets were bonded in second premolar. For determining the effects of fixed orthodontic appliance on the gingivel tissue, the changes of chnical crown length, periodintal pocket depth, gingival sulcus fluid were checked. The results were as follows. 1. Gingival condition was deteriorated after wearing the fixed orthodontic appliance, and the deteriorative rate was decreased gradually. 2. The greatest gingival change was occurred in the maxillary first morlar among the experimental teeth. 3. The gingival change of maxillary teeth was treater than that of mandibular teeth.(p< or =0.01) 4. The greater gingival change was occurred around subgingivally located band than around supragingivally located band. 5. Comparing the gingival changes of banded teeth with them of bonded teeth, the gingival tissue was more effected by oral hygiene than by type of appliances. 6. In the quantitive changes of gingival crevicular fluid, there was no exact relationship with gingival inflammation.