A comparative study in three methods of bracket placement

概要

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Results of orthodontic treatment with the straight-wire appliances largely depend on bracket positioning. Forty subjects with individual normal occlusion (20 males, 20 females, mean age 23 years) were selected from Tokyo Dental College student. Their orthodontic diagnostic models were digitized with a laser scanner. Three bracket placement methods were compared : the FA Method, which bisects the clinical crown into the gingival and occlusal portions, the Height Method, which measures from the incisal edges and cusp tips, and the Marginal Ridge Method, which measures from the marginal ridges. The bracket positions determined according to the three methods were plotted, and least square planes were constructed from the plots to measure the distance from the plane to each bracket position. In the maxillary arch, the anterior and first molar brackets tended to be positioned more gingivally and premolar brackets more occlusally. In the mandibular arch, all the three methods tended to position the central, lateral and first molar brackets more occlusally, and the canine and premolar brackets more gingivally. The study clarified the characteristics of the three bracket placement methods and provided useful clinical information for bracket positioning.
日本矯正歯科学会の論文